REVIEW
OF RESEARCH
AND BUSINESS RESULTS
OF THE IMS INSTITUTE
IN 2014
PREGLED
NAUČNIH I STRUČNIH
REZULTATA
INSTITUTA IMS
U 2014. GODINI
Institut za ispitivanje materijala a.d.
Beograd, decembar 2014.
PREGLED NAUČNIH I STRUČNIH REZULTATA
INSTITUTA IMS U 2014. GODINI
REVIEW OF RESEARCH AND BUSINESS RESULTS
OF THE IMS INSTITUTE IN 2014
Izdavač
Institut IMS a.d.
Beograd, Bulevar vojvode Mišića 43
[email protected]
www.institutims.rs
Za izdavača
Dr Vencislav Grabulov
Urednici
Dr Vencislav Grabulov
Dr Aleksandra Mitrović
Goran Petrović
Štampa
Razvojno-istraživački centar grafičkog inženjerstva
Tehnološko-metalurški fakultet, Beograd, Karnegijeva 4
Tiraž
250 primeraka
ISBN 978-86-82081-24-1
Tokom 2014. godine, Institut za ispitivanje materijala je ostvario ozbiljne
naučne i poslovne uspehe. U okviru tekućeg ciklusa naučnih projekata za
period 2011-2014. godina, 22 istraživača Instituta IMS uključeni su u
realizaciju sedam projekata iz tehnološkog razvoja, jedan integralni projekat i
četiri projekta iz programa osnovnih istraživanja. Ono čime se Institut IMS
može ponositi je 15 mladih istraživača upisanih na doktorske studije, čije
školovanje finansiramo iz sopstvenih sredstava. Rezultati istraživačkog rada su
u skladu sa dosadašnjim trendom rasta broja publikacija u međunarodnim
časopisima i učešća istraživača na vodećim međunarodnim skupovima. U ovoj
godini, Institut IMS je organizator četiri naučno-stručna skupa.
Odabrane stručne reference su, kao i svake godine, impresivne. Uz sve
probleme sa kojima je suočena domaća privreda, a posebno građevinska
industrija, Institut IMS je uspeo da obezbedi učešće u najznačajnijim
projektima u zemlji i regionu. U skladu sa višedecenijskom tradicijom i
ugledom, kao i širokim spektrom usluga koje pružamo, bili smo angažovani na
projektovanju, ispitivanjima i istraživanjima građevinskih objekata, materijala i
proizvoda, primeni tehnologija građenja i sistema prednaprezanja.
U 2014. godini Institut je učestvovao u najznačajnijim projektima u regionu,
kao što su most Zemun-Borča ili koridori X i XI. Doprineli smo otklanjanju
posledica katastrofalnih poplava koje su pogodile region, posebno kroz
sanaciju brojnih klizišta. Nastavili smo rad na zaštiti graditeljskog nasleđa,
obnovi i izgradnji putnih objekata duž autoputeva i magistralnih i regionalnih
puteva u Srbiji, na revitalizaciji HE Đerdap 1, u Kostolcu i na drugim hidro i
termo-elektranama, kao i na primeni IMS tehnologije građenja i sistema
prednaprezanja.
Urednici
Pregled naučnih i stručnih rezultata u 2014. godini
1
SADRŽAJ
REZULTATI NAUČNO-ISTRAŽIVAČKOG RADA .................................. 3 T 150 TEHNOLOGIJA MATERIJALA ............................................................ 5 Rad u vrhunskom međunarodnom časopisu (M21)............................................. 7 Rad u istaknutom međunarodnom časopisu (M22) ........................................... 11 Rad u međunarodnom časopisu (M23).............................................................. 13 Rad u časopisu međunarodnog značaja (M24) .................................................. 15 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 17 Saopštenje sa međunarodnog skupa štampano u izvodu (M34) ........................ 23 Rad u vodećem časopisu nacionalnog značaja (M51) ....................................... 27 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ................. 30 T 152 KOMPOZITNI MATERIJALI ............................................................. 35 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 36 Saopštenje sa međunarodnog skupa štampano u izvodu (M34) ........................ 38 T 220 GRAĐEVINARSTVO, HIDRAULIKA, PRIOBALNA
TEHNOLOGIJA, MEHANIKA TLA ............................................................... 39 Rad u vrhunskom međunarodnom časopisu (M21)........................................... 40 Rad u istaknutom međunarodnom časopisu (M22) ........................................... 42 Rad u međunarodnom časopisu (M23).............................................................. 43 Rad u časopisu međunarodnog značaja (M24) .................................................. 44 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 45 Rad u časopisu nacionalnog značaja (M52) ...................................................... 50 T 230 VISOKA GRADNJA ............................................................................. 51 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 52 Rad u časopisu nacionalnog značaja (M52) ...................................................... 54 2
Institut za ispitivanje materijala a. d. Beograd
T450 TEHNOLOGIJA METALA, METALURGIJA, PROIZVODI OD
METALA .......................................................................................................... 55 Rad u istaknutom međunarodnom časopisu (M22) ........................................... 56 Rad u međunarodnom časopisu (M23).............................................................. 57 Rad u časopisu međunarodnog značaja (M24) .................................................. 60 Predavanje po pozivu sa međunarodnog skupa štampano u celini (M31)......... 63 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 65 Rad u vodećem časopisu nacionalnog značaja (M51) ....................................... 66 Tehnička i razvojna rešenja (M80) .................................................................... 69 B 003 EKOLOGIJA ......................................................................................... 71 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 72 T 150 PETROLOGIJA, MINERALOGIJA, GEOHEMIJA ........................... 73 Rad u časopisu međunarodnog značaja (M24) .................................................. 74 Saopštenje sa međunarodnog skupa štampano u celini (M33) .......................... 76 Rad u vodećem časopisu nacionalnog značaja (M51) ....................................... 80 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ................. 81 DOKTORSKE DISERTACIJE ......................................................................... 83 ORGANIZACIJA STRUČNIH SKUPOVA .................................................... 87 NAUČNI PROJEKTI FINANSIRANI OD STRANE MINISTARSTVA
PROSVETE, NAUKE I TEHNOLOŠKOG RAZVOJA .................................. 93 ODABRANE STRUČNE REFERENCE ..................................................... 97 CENTAR ZA MATERIJALE .......................................................................... 99 CENTAR ZA METALE I ENERGETIKU ................................................... 107 CENTAR ZA PUTEVE I GEOTEHNIKU ................................................... 113 CENTAR ZA KONSTRUKCIJE I PREDNAPREZANJE ............................ 123 SERTIFIKACIONO TELO ............................................................................. 129 KONTROLNO TELO ..................................................................................... 133 Pregled naučnih i stručnih rezultata u 2014. godini
RESULTS
OF SCIENTIFIC RESEARCH
WORK
3
REZULTATI
NAUČNO-ISTRAŽIVAČKOG
RADA
4
Institut za ispitivanje materijala a. d. Beograd
Pregled naučnih i stručnih rezultata u 2014. godini
T 150
MATERIAL
TECHNOLOGY
T 150
TEHNOLOGIJA
MATERIJALA
5
6
Institut za ispitivanje materijala a. d. Beograd
POGLAVLJE U MONOGRAFIJI
MEĐUNARODNOG ZNAČAJA (M14)
M. Arsenović, L. Pezo, L. Mančić, Z. Radojević
PREDICTION AND OPTIMIZATION OF HEAVY CLAY PRODUCTS
QUALITY
Advanced materials for agriculture, food and environmental safety, Ch. 4, 87120, Advanced materials series (edited by Ashutosh Tiwari and Mikael
Syväjärvi), Scrivener publishing, Wiley, Beverly, USA, 2014.
DOI: 10.1002/9781118773857
The effects of chemical composition, firing temperature (800–1100°C), and
several shape formats of laboratory brick samples on the final product quality
were investigated. Prediction of the final laboratory products parameters was
evaluated by second order polynomial regression models (SOPs) and artificial
neural networks (ANNs), and afterwards compared to experimental results.
SOPs showed high r2 values (0.897 - 0.913 for compressive strength models,
0.942-0.962 for water absorption, 0.928 for firing shrinkage, 0.988-0.991 for
water loss during firing and 0.941 for volume mass of cubes models). ANN
model, coupled with sensitivity analysis, was obtained with high prediction
accuracy: 0.866–0.939 for compressive strength models, 0.954–0.974 for water
absorption, 0.882 for firing shrinkage, 0.982-0.988 for water loss during firing
and 0.920 for volume mass of cubes models. The optimal samples chemical
composition and firing temperature were chosen depending on a final usage of
the raw material in heavy clay brick industry.
Keywords: heavy clay products, prediction, optimization.
Pregled naučnih i stručnih rezultata u 2014. godini
7
RAD U VRHUNSKOM MEĐUNARODNOM
ČASOPISU (M21)
L. Pezo, M. Arsenović, Z. Radojević
ANN MODEL OF BRICK PROPERTIES
CALCULATION OF MINERALS CONTENT
USING
LPNORM
Ceramics International, 2014, Vol. 40, 9637-9645.
Mineralogical composition of heavy clays is one of the most important
properties when stadying raw materials in brick industry. Within this study,
quantitative determination of minerals using LPNORM calculation was
performed, using the first algorithm among the so-called norms that allows the
introduction of a list of minerals and their configuration. This algorithm is
implemented for the first time in practice, in order to calculate the minerals
content in brick raw materials.
The influence of minerals quantity, along with the firing temperature (800–1100
°C), and several shape formats of laboratory brick samples were investigated,
and the acquired data were used to build Artificial Neural Network (ANN)
model. ANN model was developed in order to predict the final products
parameters, and its results have been afterwards compared to experimental data.
ANN model, coupled with sensitivity analysis, was obtained with high
prediction accuracy, according to coefficient of determination, r2: 0.880-0.884
in compressive strength calculation, 0.954-0.960 for water absorption, 0.869 for
firing shrinkage, 0.979-0.984 for water loss during firing and 0.907 for volume
mass of cubes model.
Keywords: heavy clay, mineral content, brick quality, Artificial Neural
Networks, sensitivity analysis.
M. Vasić, Ž. Grbavčić, Z. Radojević
DETERMINATION OF THE EFFECTIVE DIFFUSIVITY
COEFFICIENT AND MATHEMATICAL MODELING OF DRYING
DATA: APPLICATION TO DRYING OF CLAY TILES
Chemical Engineering and Processing, 2014, Vol. 76, 33-44.
Drying plays an important role in the production of clay tiles. In the present
article, drying process is analyzed taking experimental data for several masonry
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Institut za ispitivanje materijala a. d. Beograd
clays obtained from different clay tile manufacturers and published data for
different clay slabs. Calculation methods and computer programs designed for
the calculation of the effective diffusion coefficient are developed. The first
calculation method represents the analytical solution of the Crank Equation,
while the second one represents the analytical solution of the Efremov Equation
with boundary conditions in the form of the flux. Unlike other materials, clay
tiles exhibit shrinkage during the drying process. For this reason, a shrinkage
correction is included in both calculation methods. Four models (A1, A2, B1
and B2) for predicting the drying behaviour are obtained as the result of
the calculation cited programs. It is shown that the calculated effective
diffusion coefficient determined by the designed computer programs, using
experimentally obtained and selected published data sets have similar values to
those of the same coefficient reported in the literature. Based on the
mathematically determined prognostic values of the effective diffusion
coefficient, it was concluded that there is more than 90% agreement between
the experimentally recorded and the calculated drying curves.
Keywords: diffusivity; clay tiles; mathematical modeling; convective drying.
M. Vasić, Ž. Grbavčić, Z. Radojević
ANALYSIS OF MOISTURE TRANSFER DURING THE DRYING OF
CLAY TILES WITH PARTICULAR REFERENCE TO AN
ESTIMATION
OF
THE
TIME-DEPENDENT
EFFECTIVE
DIFFUSIVITY
Drying Technology, 2014, Vol. 32, No. 7, 829-840.
Description of the drying process is reduced to the establishment of a series
theoretical and empirical drying models. Complex processes of simultaneous
moisture and heat transfer, which are often non-stationary and the distinct
nature and properties of the drying material, complicate even more the
description of drying process.Three theories: the diffusion theory, the capillary
flow theory and the "evaporation-condensation theory" have won a general
recognition for explanation of the moisture transfer in porous media. The
mechanisms of moisture movement during drying in the constant and especially
in the falling drying period is rather complex, and up to now there was no
generally accepted explanations which could identify the exact transition
Pregled naučnih i stručnih rezultata u 2014. godini
9
between possible drying mechanisms such as: liquid movement due to capillary
forces, liquid diffusion due to concentration gradients, liquid and vapor flow
due to differences in total pressure, vapor diffusion due to difference in vapor
concentration, vapor diffusion due to partial-vapor pressure gradients, Knudsen
diffusion, thermo diffusion and evaporation -condensation mechanism. The goal
of this study was to find a way to better understand different drying
mechanisms, to identify exact transition between them and to estimate a time
dependent effective diffusivity. Results presented in this study have confirmed
the fact that effective diffusivity represents an overall mass transport property of
moisture which includes all possible moisture transport mechanisms which are
simultaneously controlling the moisture migration process in material during
drying. Experimental investigations were carried out, on clay tiles, in a
laboratory recirculation dryer in which drying parameters (humidity,
temperature, and velocity) could be programmed, controlled and monitored
during drying.
Keywords: drying mechanisms, effective diffusivity, clay tile, drying,
shrinkage.
A. Mitrović, M. Zdujić
PREPARATION OF POZZOLANIC ADDITION BY
MECHANOCHEMICAL TREATMENT OF KAOLIN CLAY
International Journal of Mineral Processing, 2014, 132, 59–66.
Batches containing 5 kg of Serbian medium-quality kaolin clay were
mechanically treated in a conventional ball mill for 10, 30, 60, 120, 600 and
1200 min of milling time. High reactive pozzolanic addition was obtained as a
result of a number of physicochemical changes induced by milling, namely
particle size reduction, specific surface area increase, morphization/
dehydroxylation of kaolinite phase and homogenization of clay constituents.
The main characteristics of the pozzolanic material obtained after 1200 min of
milling were: median particle size of 6.35 μm, specific surface area of 21.75m2
g−1, total pore volume of 0.0580 cm3 g−1, pozzolanic activity (compressive
strength) of 14MPa, and reactive silica content of 33.3 wt.%. Continuous
increase of pozzolanic activity, despite the agglomeration of particles that was
accompanied with specific surface area decrease when milling time was
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Institut za ispitivanje materijala a. d. Beograd
prolonged, could be explained by kaolinite amorphization as well as the
mechanical activation of quartz..
Keywords: Milling, Clays, Kaolinite, Quartz, Pozzolan.
Pregled naučnih i stručnih rezultata u 2014. godini
11
RAD U ISTAKNUTOM MEĐUNARODNOM
ČASOPISU (M22)
M. Arsenović, L. Pezo, L. Mančić, Z. Radojević
THERMAL AND MINERALOGICAL CHARACTERIZATION OF
LOESS HEAVY CLAYS FOR POTENTIAL USE IN BRICK INDUSTRY
Thermochimica Acta, 2014, Vol. 580, 38-45.
This paper describes a study of 11 selected samples of loess soil from Serbia, by
using differential scanning calorimetry, simultaneously with thermogravimetry
and its differential calculation, known as simultaneous thermal analysis (STA).
This survey is supplemented by chemical and mineralogical analysis, particle
size distribution, and plasticity and drying susceptibility tests. Correlation
analysis of major oxides content and certain technological test results were used
for better understanding of the raw material composition and product physical
properties. The results indicate that the samples were rich in carbonates, with
the highest content of alevrite fraction and variable content of clay-sized
particles. Mineralogical analysis confirms significant correlations between
major oxides content and reveals that the most common non-clay mineral
present is quartz, followed by calcite, dolomite and sodium feldspar. Major clay
minerals include illite, chlorite, smectite and, in some cases, low quantities of
kaolinite. Although STA method is well-known, this is the first time that it was
used for discussion about its practical aspect, for characterization of the loess
deposits, in terms of exploitation in brick industry.
Keywords: loess deposits, thermal analysis, brick industry
A. Prstić, Z. Aćimović-Pavlović, A. Terzić, Lj. Pavlović
SYNTHESIS AND CHARACTERIZATION OF NEW REFRACTORY
COATINGS BASED ON TALC, CORDIERITE, ZIRCON AND
MULLITE FILLERS FOR LOST FOAM CASTING PROCESS
Archives of Metallurgy and Materials, 2014, Vol. 52, No. 1, 89-95.
This study presents results of the investigation of the high-temperature materials
- refractory coatings based on different refractory fillers talc, cordierite, zircon
and mullite, which are applied in Lost Foam casting process. Design and
optimization of the coatings composition with controlled, rheological properties
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Institut za ispitivanje materijala a. d. Beograd
included, and consequently synthesis was achieved by application of different
coating components, namely different suspension agents and fillers and by
alteration of the coating production procedure. Morphologic and microstructural
analysis of fillers was carried out by means of scanning electronic microscope.
X-ray diffraction analysis by means of X-ray diffractometer was applied in
determination and monitoring the phase composition changes of the refractory
fillers. An analysis of the particle size and shape was carried out by means of
the PC software application package OZARIA 2.5. To assess the effects of
application of individual refractory coatings, a detailed investigation of
structural and mechanical properties of the moldings obtained was performed.
Highlight was placed on revealing and analyzing surface and volume defects
present on moldings. Radiographic molding tests were carried out by means of
the X-ray device SAIFORT type-S200. Attained results are essential for the
synthesis of refractory coatings based on high-temperature fillers and their
applications in Lost Foam casting process for manufacturing of moldings with
in-advance-set properties.
Keywords: high-temperature materials, refractory coatings, talc, cordierite,
zircon, mullite, Lost Foam.
Pregled naučnih i stručnih rezultata u 2014. godini
13
RAD U MEĐUNARODNOM ČASOPISU (M23)
A. Terzić, Lj. Andrić, M. Petrov, Z. Radojević, Lj. Miličić
INVESTIGATION OF HIGH TEMPERATURE BEHAVIOR AND
SINTERING MECHANISM OF FLY ASH BASED CONCRETES
Romanian Journal of Materials, 2014, Vol. 44, No. 3, 213–224.
Four types of refractory concretes with the same matrix composition, one based
on corundum aggregate, the other on bauxite aggregate and chamotte filler, and
two additional variations with the same compositions and 30 % of fly ash
replacement in bonding agent, have been studied at temperatures ranging from
room temperature to 1400°C as adopted maximal temperature. Fly ash was
mechanically activated by means of planetary ball mill type “Retsch-PM100”.
Samples were dried at 110°C during 24 h to create standard specimens.
Afterwards, the samples were prefired at 1100°C and subsequently subjected to
compressive uniaxial creep test conducted at various temperatures (1200, 1300
and 1400°C). Thermal behavior was also investigated by dilatometry from room
temperature up to 1400°C. The evolution of the refractory concretes behavior
from quasi-brittle to visco-plastic was investigated and correlated to their
microstructure evolution induced by sintering process. The influence of the
firing temperature and duration on the concretes behavior is also discussed.
Creep test and dilatometic analysis helped in defining of the mechanism of
sintering and its parameters, and additionally damageable and viscoplastic
nature of the refractory concrete.
Keywords: sintering; thermal treatment; composites; thermal properties;
environment.
K. Janković, Lj. Miličić, S. Stanković, N. Šušić
INVESTIGATION OF THE MORTAR AND CONCRETE RESISTANCE
IN AGGRESSIVE SOLUTIONS
Technical Gazette, 2014, Vol. 21, No.1, 173-176.
Testing the influence of two aggressive solutions - sulfate and nitrate on mortar
and concrete was presented in this paper. Experimental work included testing of
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Institut za ispitivanje materijala a. d. Beograd
mortar prisms with 5 % special admixture. Also, four types of concrete were
exposed to aggressive solutions. The chemical resistance was tested according
to the Koch-Steinegger method. As a condition for resistance in aggressive
solution means that flexural strength of mortar prisms no less than 70 % of
referent prisms cured in water it can be concluded that mortar and concrete
made with combination of cement and admixture presented in this investigation
are not resistant to ammonium nitrate solution, but is resistant to sulfate
corrosion.
Keywords: chemical aggression, concrete, Koch-Steinegger method, mortar.
K. Janković, A. Ilić, M. Stojanović
THE INFLUENCE OF SILICA FUME AND CURING REGIME ON
SOME PROPERTIES OF CONCRETE
Romanian Journal of Materials, 2014, Vol. 44, No. 1, 46-53.
The investigation of possibilities of concrete structure modification by silica
fume to improve concrete properties was presented in this report. Percentage of
silica fume in regard to cement varied between 0% and 20%. Concrete was
cured as follows: in water, steam – curing regime at +60oC and +90oC. The
results of the compressive and tensile strength, freeze / thaw resistance with deicing salts, and depth of penetration of water under pressure.
Кeywords: silica fume, steam – curing regime, concrete durability.
Pregled naučnih i stručnih rezultata u 2014. godini
15
RAD U ČASOPISU MEĐUNARODNOG
ZNAČAJA (M24)
M. Arsenović, S. Stanković, Z. Radojević, L. Pezo
THE EFFECTS OF CHEMICAL COMPOSITION AND FIRING
TEMPERATURE IN HEAVY CLAY BRICK PRODUCTION –
CHEMOMETRIC APPROACH
Interceram, 2014, Vol. 01–02 (Special issue Tile and Brick), 26-29.
Factors influencing final clay brick properties are numerous, since the raw
materials are highly heterogeneous. The chemometric approach is rarely used in
analysis in this field, although it could significantly improve understanding of
the overall system behavior and the quality of products. Principal component
analysis (PCA) was used on a group of 139 samples collected in Serbia to
discriminate groups of samples according to similarity of chemical composition
and fired laboratory products properties. The focus of this study was to
determine the importance of parameters that describe clay brick production and
quality, depending on final usage of raw material in the clay brick industry. A
fuzzy synthetic evaluation, using a membership trapezoidal function with
defined optimal interval values for different types of heavy clay products, is
chosen for the study. The optimal sample‘s chemical composition and firing
temperature were chosen by the fuzzy synthetic evaluation, regarding the kind
of the heavy clay product.
Keywords: heavy clay, brick, chemometry, principal component analysis
(PCA).
K. Janković, D. Bojović, M. Stojanović, Lj. Lončar
RESISTANCE OF CEM III/B BASED MATERIALS TO ACID ATTACK
Građevinski materijali i konstrukcije, 2014, Vol. 57, No. 2, 29-37.
Cement based materials in the agricultural and other industrial structures are
exposed to acid attack. That is the reason why the service life of structure
depends on the durability of mortar or concrete elements in aggressive
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Institut za ispitivanje materijala a. d. Beograd
environment. Resistance to corrosion caused by sulphate, nitrate, carbamide,
lactic acid and acetic acid was presented. Optical and scanning electron
microscopy (SEM) was used to examine the effect of aggressive solutions on
the microstructure and mechanical properties of mortar. The chemical resistance
of mortar prisms and two types of concrete were tested according to the KochSteinegger method. As the condition for resistance in aggressive solution is that
flexural strength of mortar prisms is no less than 70 % compared to referent
prisms cured in water it can be concluded that mortar and concrete made with
CEM III/B in this investigation are resistant to all treated acids.
Keywords: chemical aggression, CEM III/B, Koch-Steinegger method,
durability.
Pregled naučnih i stručnih rezultata u 2014. godini
17
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
M. Arsenović, L. Pezo, Z. Radojević
BRICKS MADE OF LOESS – OPTIMIZATION USING PRINCIPAL
COMPONENT ANALYSIS
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 911-917.
The loess heavy clay sample MI2, containing about 65 % of silt sized particles,
was mixed with two heavy clays at neighboring locations (SU1 and SU3).
Added materials contained less allevrolite fraction. The effect of process
parameters on the bricks production, such as firing temperature (900–1000 °C),
and concentration of 2 added clays (both in the range of 0-10 wt.%) were
investigated in terms of independent parameters: compressive strength, water
absorption, firing shrinkage, weight loss during firing and volume mass.
Developed models were capable to predict responses in a wide range of
parameters and showed good coefficients of determination, in the range of
0.438 - 0.999.
Keywords: prediction, process parameters, loess heavy clay, brick, Response
Surface Method.
M. Vasić, Z. Radojević
DRYING SIMULATION OF CLAY TILES MADE FROM THE RAW
MATERIALS HAVING LESS CLAY FRACTION
Modtech International Conference 2014, Gliwice, Poland, July 13-16, 2014,
published in Advanced Material Research, 2014, Vol. 1036, 3-8.
In order to describe the internal moisture rate and to take all different
mechanisms of moisture movement into account, it is suitable to use effective
diffusivity as a measure of moisture rate, irrespectively of the mechanisms
really involved. This means that all different mechanisms and driving forces for
internal moisture transport are lumped together and introduced into effective
moisture diffusivity. Hence, diffusion equations are retained and reused with the
effective diffusivity coefficient as a measuring parameter of internal moisture
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Institut za ispitivanje materijala a. d. Beograd
ratio. In our previous studies we have presented the calculation method which
assumed constant diffusivity. The next goal was to estimate effective diffusivity
at various moisture contents, in a real case of non-linear drying curves, and to
predict drying kinetic. In our last study we have developed a model for
determination of the variable effective diffusivity and identification of the exact
transition points between possible drying mechanisms. In this paper we have
tried to develop more accurate tool for determination of time dependent
effective moisture diffusivity. An analytical model and computing procedure
were developed to evaluate mass transfer properties and describe drying kinetic
of clay tiles having less clay fraction. The proposed procedure was validated
with experimental drying data. Presented results have demonstrated that the
proposed dying model can be applied for the accurate description of
experimental drying kinetics and a reliable estimation of effective diffusivity.
Keywords: drying mechanisms, effective diffusivity, clay tile, drying,
shrinkage.
M. Vasić, Z. Radojević
DRYING SIMULATION OF SHRINKABLE CLAY TILES USING
VARIABLE DIFFUSIVITY MODEL
Modtech International Conference 2013, Sinaia, Romania, June 27-29, 2013,
published in Advanced Material Research, 2014, Vol. 873, 506-510.
This paper represents the upgrade of our previous study in which we have
presented a model for simulation of the drying kinetic and estimation of the
effective moisture diffusivity of clay tiles using a constant diffusivity model.
The main objective of this study is to determine the time - dependent effective
moisture diffusivity of shrinkable clay tiles. Experimental investigations were
carried out, on clay tiles, in a laboratory recirculation dryer in which drying
parameters (humidity, temperature, and velocity) could be programmed,
controlled and monitored during drying. Results presented in this study have
shown that the proposed drying model describes and correlates accurately
drying kinetics and gives a reliably estimation of the time - dependent effective
moisture diffusivity.
Keywords: drying mechanisms, effective diffusivity, clay tile, drying,
shrinkage.
Pregled naučnih i stručnih rezultata u 2014. godini
19
A. Terzić, Lj. Miličić, Z. Radojević, Lj. Andrić, Lj. Pavlović
STUDY OF THE SINTERING PROCESS KINETICS OF CORUNDUM
REFRACTORY SHOTCRETE
46th International October Conference on Mining and Metallurgy, Bor, 2014,
72-75.
Corundum based refractory shotcrete with addition of coal ash as microfiller
was investigated. The fly ash underwent mechanical activation in vibratory mill
before mixing with high aluminate cement, by such fulfilling the request for
obtaining a low-cement castable. The shotcrete samples were dried at 110°C
during 24 h to create standard specimens for investigation of mechanical and
thermal properties, which were studied in temperature interval 20 - 1400°C.
Kinetics of sintering was investigated by differential thermal analysis at three
heating rates. The evolution of shotcrete properties was investigated and
correlated to microstructural changes induced by temperature and microfiller
addition. The combination of advantages in investigated refractory shotcrets
makes it suitable for use in severe conditions at high temperature in refractory
industries.
Keywords: sintering, refractories, coal ash, corundum, mechanical activation.
K. Janković, D. Bojović, Lj. Lončar, M. Stojanović
WEATHER RESISTANCE OF PAVING UNITS AND KERBS WITH
DIFFERENT TYPES OF CEMENT
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 927-934
Properties of air voids in hardened concrete are analyzed by RapidAir 457. Air
content and w/c of fresh concrete was not in accordance with the
recommendations of EN 206-1 for exposure class XF2. After obtained results of
air void specing factor according to EN 480-11, it was expected according to
SRPS U.M1.206 that all types of concrete will satisfied class XF2. Results
obtaing by testing freeze/thaw resistance with de-icing salt according to EN
1338 confirm that.
Key words: freeze/thaw,air void,specing factor.
20
Institut za ispitivanje materijala a. d. Beograd
K. Janković, D. Bojović, Lj. Lončar, M. Stojanović
DETERMINATION DEICING SALT SCALING RESISTANCE OF
CONCRETE WITH RECYCLED BRICK AGGREGATE
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 935-940.
Determination of the concrete resistance to frost action in the presence of deicing salt is defined by EN standards as well as numerous national standards.
Determination of the quantity and spacing factor of pores in the hardened
concrete can provide reliable assessment of the durability of concrete in the XF
exposure classes. The application of this method is questionable in the case of
application aggregate with increased water absorption. In the case of application
of recycled aggregates from crushed brick this fact is especially pronounced.
The aim of the paper is to compare test method with device RapidAir 457 and
the classic tests on concrete with recycled aggregates.
Keywords: freeze/thaw, air void, spacing factor, crushed brick.
D. Bojović, K. Janković, M. Stojanović, Lj. Lončar,
CHANGING THE STRUCTURE OF CONCRETE AFTER EXPOSURE
TO FROST
International Conference Contemporary Achievement In Civil Engineering,
Subotica, 2014, 497-501.
Concrete testing can be done at micro, mezzo and macro level. Tests at the
macro level are the most common and are the ultimate engineering approach,
and include testing and comparison of quantities such as commpresive strength,
modulus of elasticiti and the like. In this manner you can determine changes in
structures of concrete. To be considered during the examination and the file
structure of concrete should be seen as concrete material composed of cement
stone and aggregate, that is switch to a lower level of analysis – mezzo level.
Concrete exposed to freezing changes its characteristics both in terms of
strength and in terms of the structure. The aim of this study is to determine how
to modify the structure of the concrete after frost action. Changing the structure
of concrete was evaluated qualitative and quantitative analysis of pores using a
device RapidAir 457.
Pregled naučnih i stručnih rezultata u 2014. godini
21
Keywords: frost resistance, pores, RapidAir 457.
K. Janković, Lj. Miličić, D. Bojović, Lj. Lončar, M. Stojanović
THE POSSIBILITY OF USING MINE TAILINGS AS A PARTIAL
AGGREGATE REPLACEMENT
International Symposium and XXVI Congress DIMKS, Vrnjačka Banja, 2014,
131-136.
In order to examine the differences in chemical composition and the possibility
of using mine tailings in mortar and concrete production, samples were taken
from the landfill and directly from the production. Material that was milled and
met the criteria of SRPS B.C1.018 was used for the determination of pozzolanic
activity. None of the samples showed pozzolanic activity. Because of that, this
material cannot be used as a partial replacement for cement. In order to examine
the possibility of using it as aggregate, mortar samples with 5% and 10% of 0/4
mm fractions replaced with tailings were made. Results of compressive and
flexural strength were compared with the control mix.
Keywords: tailings, aggregate, mortar.
D. Bojović, K. Janković, Lj. Lončar, M. Stojanović
COMPARATION OF NONDESTRUCTIVE AND DESTRUCTIVE
TESTING OF CONCRETE FREEZE/THAW RESISTANCE WITH DEICING SALT
International Symposium and XXVI Congress DIMKS, Vrnjačka Banja, 2014,
177-182.
Concrete resistance to frost action with and without the presence of de-icing salt
(agent) is defined by many standards. According to SRPS U.M1.055 concrete is
tested through exposure to traditional concrete cyclic freezing and thawing in
the presence of salts (agent) after which the amount of scaled materials is
measured. Non destructive testing is most often done by measuring the quantity,
spacing factors and other properties of pores in the hardened concrete. Two
types of concrete with different air content were tested. The aim of the paper is
to compare test method with device Rapid Air 457 and classic tests performed
22
Institut za ispitivanje materijala a. d. Beograd
on concrete. This paper is the product of real demand of a concrete producer
who in early age of concrete wanted to know if the concrete was resistant to
frost in the presence of salt.
Keywords: freeze/thaw resistance, de-icing agent, pores, Rapid Air 457.
Pregled naučnih i stručnih rezultata u 2014. godini
23
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U IZVODU (M34)
M. Arsenović, L. Pezo, L. Mančić, Z. Radojević
ADVANCED OPTIMIZATION OF HEAVY CLAY PRODUCTS
QUALITY BY USING ARTIFICIAL NEURAL NETWORK MODEL
Serbian Ceramic Society Conference Advanced Ceramic and Application,
Belgrade, 2014, 82.
The effects of firing temperature (800–1100°C), chemical composition
(expressed in terms of the content of major oxides - SiO2, Al2O3, Fe2O3, CaO,
MgO, Na2O, K2O, MnO and TiO2), as well as several shape formats of
laboratory brick samples on the final product quality were investigated.
Prediction of the final laboratory products parameters was evaluated by second
order polynomial regression models (SOPs) and artificial neural networks
(ANNs), and afterwards both models were compared to one another and to
experimental results. . Observed parameters of fired products that were
determined in this study were: compressive strength (CS), water absorption
(WA), firing shrinkage (FS), weight loss during firing (WLF) and volume mass
of cubes (VMC). SOPs showed high r2 values (0.897 - 0.913 for compressive
strength models, 0.942-0.962 for water absorption, 0.928 for firing shrinkage,
0.988-0.991 for water loss during firing and 0.941 for volume mass of cubes
models). ANN model, coupled with sensitivity analysis, was obtained with high
prediction accuracy: 0.866–0.939 for compressive strength models, 0.954–0.974
for water absorption, 0.882 for firing shrinkage, 0.982-0.988 for water loss
during firing and 0.920 for volume mass of cubes models. The optimal samples
chemical composition and firing temperature were chosen depending on a final
usage of the raw material in heavy clay brick industry.
Keywords: heavy clay products, prediction, optimization.
24
Institut za ispitivanje materijala a. d. Beograd
Ž. Sekulić, M. Kragović, A. Terzić, S. Mihajlović, V. Kašić, M. Petrović
PROPERTIES OF PORTLAND CEMENT WITH ADDITION OF PBZEOLITE
Zeolite 2014, 9th International Conference of the Occurrence, Properties, and
Utilization of Natural Zeolites, Belgrade, 2014, 211-212.
It is well known that various materials that exhibit latent hydraulic properties
can be used as SCM’s (Supplementary Cementitious Materials) in Portland
cement (Opoczky and Beke 1967, Knape et al., 1967). The quantity of these
SCM’s is strictly limited. The SCM’s which are often used in cement
production are: composition by decreasing the calcium hydrate products and
improving the chemical, acidic and sulphate stability. They can be milled before
or milled together with the clinker. Zeolite may be considered as natural
pozzolanic material in accordance with the (EN 197-1). Like other pozzolanic
materials, being mixed with water, it does not harden, but if it is smoothly
grinded it reacts in the presence of water at ambient temperature with the
soluble hydroxide of calcium to form the silicates and aluminates of calcium,
which are responsible for the increased hardness (Janotka and Krajci 2000). The
aim of the present work is the investigation of the influence of the combination
of the Pb-zeolites on the properties of Portland cement type PC42.5R-BFC. The
aim of this investigation was to imitate the procedure of Pb removal from the
water by application of zeolite. Namely, a question has been raised concerning
possibility of reapplication contaminated filter, i.e. zeolite which has been
saturated with lead.
Keywords: zeolite, cements, reapplication.
A. Terzić, Z. Radojević, Lj. Miličić, N. Obradović, Lj. Andrić
CORUNDUM AND BAUXITE REFRACTORY SHOTCRETES BASED
ON ACTIVATED WASTE COAL ASH: INVESTIGATION OF
THERMALLY INDUCED PROPERTIES CHANGE
Serbian Ceramic Society Conference Advanced Ceramic and Application III –
New frontiers in multifunctional material science and processing, Belgrade,
2014, 70.
Pregled naučnih i stručnih rezultata u 2014. godini
25
The necessity for application of activated secondary raw materials in refractory
industry is caused by a growing demand for refractory castables with advanced
properties and continuous technological evolution of high-temperature
materials. In this investigation, refractory shotcretes with the same matrix
composition were prepared from 15 wt.% of high aluminate cement and 45
wt.% of bauxite aggregate + 30 wt.% of chamotte filler, i.e. 75% of corundum
aggregate. The request for obtaining a low-cement castable is fulfilled by
application of 10 wt.% of mechanically activated coal ash as the cement
substitution in the shotcretes. The ash was activated by means of various high
energy mechano-activators. Results were compared in order to choose the most
efficient activation procedure. The properties have been studied at temperatures
ranging from room temperature to adopted maximal temperature 1400°C.
Mechanisms of hydration and sintering were investigated by means of
differential thermal analysis at three different heating rates. The measurements
showed different activation energies for ordinary shotcretes and shotcretes with
activated ash. The evolution of the refractory shotcretes properties was
investigated and correlated to microstructural changes induced by temperature
and microfiller addition. The combination of advantages in investigated
refractory shotcretes makes them suitable for use in severe conditions at high
temperature applications especially in refractory industries.
Keywords: waste ash, ceramics, composites, refractories, ceramics, sintering,
ecology.
Z. Radojević, I. Delić Nikolić, A. Terzić
CHARACTERIZATION OF MATERIAL AS A SUPPLY SOURCE FOR
HERITAGE AQUEDUCT CONSTRUCTION IN FYR MACEDONIA
Serbian Ceramic Society Conference Advanced Ceramic and Application III –
New frontiers in multifunctional material science and processing, Belgrade,
2014, 69.
Aqueduct which is situated in Skoplje, FYR of Macedonia represents an
important archeological emplacement. Judging from the aspect of cultural
heritage, but also from the aspect of material science, this historical site
provides plenty of investigation material. It is not possible to determine the
exact date of building of the aqueduct, due to the changes and reparation work
performed on some parts of the structural elements. The condition of the
26
Institut za ispitivanje materijala a. d. Beograd
aqueduct is adversely, namely, level of deterioration of some parts of the
construction is high. This investigation was conducted as the initial stage of the
restoration and renovation of the object. In this light, the first step was to mark
sampling locations on the object and to sample characteristic brick specimens.
Special attention was paid on avoiding of the additional damage of the
monument. After sampling procedure, specimens were carefully preserved and
prepared for further laboratory testing; by such making the investigation results
as accurate as possible. Namely, precise results of the physical, mechanical,
chemical and mineralogical properties give a closer insight to the structure of
“old” brick material and enable to design “new material” with similar properties
which would be applied in restoration process. Applied investigation is mostly
engaged with textural characteristics because newly designed material that
ought to replace original material built in the monument should aesthetically fit
in the building conception and satisfy durability of this renovated heritage
monument.
Keywords: ceramic, brick, stone, textural properties, cultural heritage.
Pregled naučnih i stručnih rezultata u 2014. godini
27
RAD U VODEĆEM ČASOPISU
NACIONALNOG ZNAČAJA (M51)
M. Vasić, Z. Radojević
PRIKAZ STANDARDA SRPS EN 15037-3 – ZAHTEVI I
KARAKTERISTIKE BLOKOVA OD GLINE ZA MEĐUSPRATNE
KONSTRUKCIJE
Izgradnja, 2014, Vol. 68, No. 8-9, 9-12.
Pored klasičnih nenosećih blokova, prepoznatljivih na našem tržištu, ovaj
standard prepoznaje i polunoseće odnosno noseće blokove za međuspratne i
krovne sisteme konstrukcija. U radu su predstavljeni zahtevi i osnovni
kriterijumi u pogledu osobina koje moraju da ispune svi tipovi blokova od gline,
namenjenih za ugradnju u međuspratnim konstrukcijama, a koji su definisani
standardom SRPS EN 15037-3. Najvažnije karakteristike kvaliteta su:
geometrijske i površinske karakteristike, mehanička čvrstoća, bruto zapremiska
masa u suvom stanju i vlažno širenje. Proizvođači moraju kontinuirano
dokazivati kvalitet proizvoda što podrazumeva da u svojoj tehničkoj
dokumentaciji imaju dokumentovane podatke o: gemetrijskim karakteristikama,
klasi proizvoda, savojnoj i pritisnoj čvrstoći, otpornosti prema požaru,
akustičkim, termičkim osobinama, trajnosti i drugim zahtevima.
Keywords: SRPS EN 15037-3, blokovi od gline za međuspratne konstrukcije.
Z. Radojević, A. Terzić, M. Vasić
OPTIMIZACIJA I PROJEKTOVANJE TENISKE ŠLJAKE OD
ŠKARTA PEČENIH OPEKARSKIH PROIZVODA
Izgradnja, 2014, Vol. 68, No. 8-9, 31-38.
U ovom radu je istraživano ponašanje teniske šljake od škarta pečenih
opekarskih proizvoda i izvršena je optimizacija fizičko-mehaničkih
performansi. Svojstva mešavina sa različitim koncentracija otpada su dobijena
pomoću standardnih laboratorijskih ispitivanja. U cilju optimizacije performansi
šljake ispitivana su sledeća svojstva: početna vlažnost svake mešavine, uticaj
različitih spoljnih faktora kao što je sušenje i mržnjenje i određena je
28
Institut za ispitivanje materijala a. d. Beograd
ravnotežna vlažnost mešavina. Praćeni su procesni parametari i promene
svojstava mešavina značajnih za process proizvodnje novog finalnog proizvoda
- umešavanje, sušenje i pakovanje. Na kraju su prikazani najvažniji zaključci
ovog istraživanja.
Keywords: šljaka, opeka, optimizacija, svojstva..
M. Vasić, Z. Radojević
OPIS TRANSPORTA VLAGE TOKOM IZOTERMSKOG SUŠENJA
OPEKARSKIH PROIZVODA
Izgradnja, 2014, Vol. 68, No. 8-9, 64-69.
U poslednjih tridesetak godina objavljeno je više radova čiji je glavni cilj bio
određivanje efektivnog koeficijeta difuzije i opis kinetike sušenja čvrstih i
poroznih materijala. Iako su u literaturi pojedinačno detaljno opisani svi
potencijalno mogući transportni procesi i mehanizmi koji se javljaju tokom
sušenja sve do sada nije postojalo sveobuhvatno objašnjenje koje bi ih sve
objedinilo a kamoli prepoznalo kada se koji mehanizam javlja tokom procesa
izotermskog sušenja opekarskih proizvoda. Upravo ovaj rad je pruža odgovore
na prethodna pitanja..
Keywords: izotermsko sušenje, efektivni koeficijent difuzije, kinetika sušenja,
porozni materijali.
M. Vasić, Z. Radojević
ISPITIVANJE ŠIRENJA POD DEJSTVOM VLAGE NA DOMAĆIM
OPEKARSKIM PROIZVODIMA
Izgradnja, 2014, Vol. 68, No. 8-9, 83-87.
U radu je dat prikaz ispitne metode za određivanje širenja pod dejstvom vlage
obuhvaćene standardom SRPS EN 772-19. Za potrebe ove analize korišćeni su
uzorci opeka, šupljih blokova od gline i šupljih blokova od gline za
međuspratne konstrukcije različitih domaćih proizvođača. Izabrane su po dve
analize iz svake grupe proizvoda. Iz svake analize je izdvojeno i pripremljeno
po šest uzoraka. Na pripremljenim uzorcima je izvršeno ispitivanje širenja pod
dejstvom vlage. Rezultati su pokazali da postoje razlike u vrednosti širenja pod
Pregled naučnih i stručnih rezultata u 2014. godini
29
dejstvom vlage kako u okviru grupa tako i između grupa. Kod većine ispitanih
uzoraka vrednosti širenja pod dejstvom vlage su bile manje od 0,5 mm/m. Ove
vrednosti širenja pod dejstvom vlage su u slučaju sprečenog širenja uzroci
pucanja proizvoda.
Keywords: širenje pod dejstvom vlage, opekarski proizvodi.
30
Institut za ispitivanje materijala a. d. Beograd
SAOPŠTENJE SA SKUPA NACIONALNOG
ZNAČAJA ŠTAMPANO U CELINI (M63)
M. Arsenović, L. Pezo, Z. Radojević
UTICAJ RASPODELE VELIČINE ČESTICA OPEKARSKIH
SIROVINA NA PLASTIČNOST, SUŠENJE I OSOBINE SUVIH
OPEKARSKIH PROIZVODA
Izgradnja, 2014, Vol. 9-10, 59-63.
Cilj ovog istraživanja je definisanje uticaja raspodele veličine čestica
opekarskih sirovina na oblikovanje (vlaga oblikovanja, koeficijent plastičnosti),
osetljivost na sušenje (gubitak mase u kritičnoj tački prema Bigo krivi) i
osobine suvih opekarskih proizvoda (čvrstoća pri pritisku i skupljanje u
sušenju). Zaključeno je da, među analiziranim opekarskim sirovinama,
statistički značejne uticaje (na nivou p < 0,1 i pri poverenju od 95 %) ima
količina frakcije gline, pri čemu je dejstvo najveće na plastičnost, zatim
osetljivost u sušenju i skupljanje u sušenju. Skupljanje u sušenju i plastičnost su
pokazali najveću zavisnost od sadržaja karbonata. Na osnovu korelacija i
analize glavnih komponanta (PCA) utvrđeno je da su karbonati konsituenti sve
tri prou;avane frakcije, i da sadržaj glinovite frakcije najviše utiče na čvrstoću
pri pritisku suvih šupljih blokčića.
Ključne reči: raspodela veličine čestica, opekarski proizvodi, oblikovanje i
sušenje.
M. Arsenović, L. Pezo,, Z. Radojević
OPTIMIZACIJA PROCESA PEČENJA I KVALITETA PROIZVODA
METODOM ODZIVNE POVRŠINE
Izgradnja, 2014, Vol. 9-10, 70-75.
Reprezentativnoj glini, koja pripada najplastičnijim (NPL), su dodavane dve
umereno plastične sirovine (UP1 i UP2) u različitim odnosima. Ispitivan je
uticaj različitih procesnih parametara pri proizvodnji opeke, kao što su
temperatura pečenja (900-1100°C) i količina umešavanih opekarskih sirovina (u
rasponu od 0-10%), na kvalitet proizvoda. Razvijeni su matematički modeli za
Pregled naučnih i stručnih rezultata u 2014. godini
31
predviđanje čvrstoće pri pritisku, upijanja vode, skupljanja pri pečenju, gubitka
mase tokom pečenja i zapreminske mase. Modeli su pokazali prilično visoke
vrednosti r2 (0,703 - 0,994). Optimalni uslovi su određeni metodom odzivne
površine (RSM), korišćenjem algoritma sintetičke fazi evaluacije (FSE), uz
pomoć trapezoidne funkcije pripadnosti. Na osnovu laboratorijskih ispitivanja,
za optimalne parametre je utvrđen dodatak 0-2% UP1 i 8-10% UP2, pri pečenju
na 900oC, što se pokazalo najpogodnije za proizvodnju šupljih blokova.
Ključne reči: predviđanje, optimizacija, procesni parametri, opeka, metoda
odzivne funkcije.
Z. Radojević, M. Arsenović, A. Terzić
PROUČAVANJE PRIRODE I UZROKA POJAVE NETIPIČNIH
DEFEKATA NA POVRŠINI KERAMIČKIH PROIZVODA
Izgradnja, 2014, Vol. 9-10, 88-93.
Reprezentativnoj glini, koja pripada najplastičnijim (NPL), su dodavane
dve umereno plastične sirovine (UP1 i UP2) u različitim odnosima.
Ispitivan je uticaj različitih procesnih parametara pri proizvodnji opeke, kao što
su temperatura pečenja (900-1100°C) i količina umešavanih opekarskih sirovina
(u rasponu od 0-10%), na kvalitet proizvoda. Razvijeni su matematički modeli
za predviđanje čvrstoće pri pritisku, upijanja vode, skupljanja pri pečenju,
gubitka mase tokom pečenja i zapreminske mase. Modeli su pokazali prilično
visoke vrednosti r2 (0,703 - 0,994). Optimalni uslovi su određeni metodom
odzivne površine (RSM), korišćenjem algoritma sintetičke fazi evaluacije
(FSE), uz pomoć trapezoidne funkcije pripadnosti. Na osnovu laboratorijskih
ispitivanja, za optimalne parametre je utvrđen dodatak 0-2% UP1 i 8-10%
UP2, pri pečenju na 900oC, što se pokazalo najpogodnije za proizvodnju
šupljih blokova.
Ključne reči: predviđanje, optimizacija, procesni parametri, opeka, metoda
odzivne funkcije.
32
Institut za ispitivanje materijala a. d. Beograd
M. Vasić, Z. Radojević
PRIKAZ PROMENA NASTALIH U NAJNOVIJIM
STANDARDA EN 539-2, EN 1024 I EN 1304
IZDANJIMA
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 1341-1349.
U radu su u kratkim crtama iznete najnovije promene u važećoj regulativi EU
koja pokriva oblast ispitivanja crepova od gline namenjenih za preklopno
polaganje kao i crepova i fazonskih komada od betona namenjenih za
pokrivanje krovova i oblaganje zidova. Direktiva CPD 89/106/EEC i Uredbe
P6-TA (2009)0320 i 305/2011 regulišu oblast usaglašenosti plasmana
građevinskih konstrukcionih materijala na teritoriji zemalja članica evropske
zajednice. U proteklom periodu, doneti su harmonizovani evropski standardi za
većinu građevinskih proizvoda, obezbeđen je visok stepen ujednačenosti
kvaliteta proizvoda i predviđeni su različiti nivoi odnosno klase perfomansi
građevinskih proizvoda. Upravo i najnovije izmene standarda se odnose na
tačke standarda koje su u direktnoj vezi sa direktivom EU za građevinske
proizvode, naročito po pitanju reakcije na dejstvo požara i ispuštanja opasnih
materija.
Keywords: Direktiva CPD 89/106/EEC, EN 539-2,EN 1024,EN 490 i EN 491.
Lj. Andrić, A. Terzić, M. Petrov, Lj. Pavlović, Lj. Miličić
POBOLJŠANJE FIZIČKO-HEMIJSKIH SVOJSTAVA LETEĆEG
PEPELA POMOĆU MEHANIČKE AKTIVACIJE
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 889-896.
U ovom radu su prikazani eksperimentalni rezultati pokušaja unapređenja
reaktivnosti letećeg pepela variranjem fizičko-hemijskih svojstava i mehaničkih
karakteristika. Za potrebe istraživanja, uzorci letećeg pepela su podvrgnuti
proceduri mehaničke aktivacije pomoću vibracionog, planetarnog i standardnog
mlina sa kuglama. Leteći pepeo je detaljno analiziran, a naročito u aktiviranom
stanju. Određeni su: specifična površina; granulometrijski sastav inicijalnog i
aktiviranog uzorka; gustina i druga svojstva. Kako bi se potpuno sagledao
Pregled naučnih i stručnih rezultata u 2014. godini
33
process i fenomeni koji se dešavaju pri aktivaciji pepela, neophodno je razumeti
teorijske principe aktivacije.
Ključne reči: Leteći pepeo; mehanička aktivacija; ponovna upotreba;
građevinski materijali.
A. Terzić, Lj. Andrić, M. Petrov, Lj. Miličić, Z. Radojević, Lj. Pavlović
ODRŽIVA REŠENJA ZA REAPLIKACIJU LETEĆEG PEPELA
POSTIGNUTA KROZ PROCES MEHANIČKE AKTIVACIJE
9. Simpozijum Reciklažne tehnologije i održivi razvoj, Zaječar, 2014, 167-173.
Cilj istraživanja je bio da se pronađe održivo rešenje za reaplikaciju letećeg
pepela poreklom iz uglja povećanjem reaktivnosti uz pomoć mehano aktivacije.
Da bi se proces aktivacije potpuno sagledao neophodno je razumeti teorijske
principe na kojima se zasniva rad aktivatora. U eksperimentu je korišćen
vibracioni mlin. Karakteristike aktiviranog pepela i mogućnost merenja inercije
zrna pomoću automatskog brojača zrna su analizirani. Na osnovu predložene
hipoteze rada ABZ, energija i svojstva zrna su uslovljeni delovanjem mehaničke
sile i izražavaju se u obliku promene inercije zrna. Pepeo koji je upotrebljen u
eksperimentu je detaljno analiziran popoću XRD i SEM metoda. Konačni
rezultat je bilo uspostavljanje gornje granice aktivacionog perioda.
Ključne reči: pepeo iz uglja; konverzija energije; vibracioni mlin; aktivacija.
J. Smiljanić, D.A. Marković
SMANJENJE EMISIJE SLOBODNOG FORMALDEHIDA IZ VEZIVA
KOJA SE KORISTE U PROIZVODNJI PLOČA NA BAZI DRVETA
51. Savetovanje Srpskog hemijskog društva, Niš, 5-7. jun 2014, 52–57.
Ovim radom se stavio akcenat na pregled veziva koja se koriste u proizvodnji
ploča na bazi usitnjenog drveta, kao i na veziva koja bi mogla ući u upotrebu
zbog svog ekološkog značaja.
Formaldehid se u velikoj meri koristi za proizvodnju sintetičkih veziva,
reakcijom fenola, uree i melamina. UF - urea – formaldehidno vezivo je najviše
korišćeno vezivo, posebno u proizvodnji ploča na bazi drveta. Za proizvodnju
kompozitnih materijala na bazi drveta se koriste veziva na bazi formaldehida,
34
Institut za ispitivanje materijala a. d. Beograd
čija kasnija emisija dovodi do ozbiljnih zdravstvenih problema. Formaldehid
predstavlja najveću brigu, proteklih godina, jer je njegova emisija i kontrola
emisije u vazduhu zatvorenog prostora važan faktor u rešavanju ekoloških i
zdravstvenih problema, u smislu da je formaldehid opasan po zdravlje i glavni
uzročnik iritacije respiratornih organa, dermatoloških problema, kao i uzročnik
pojave kancera.
Ključne reči: emisija formaldehida, sadržaj formaldehida, vezivo, fenol,
formaldehid, urea, melamin, ploče na bazi drveta.
Pregled naučnih i stručnih rezultata u 2014. godini
T 152
COMPOSITE
MATERIALS
T 152
KOMPOZITNI
MATERIJALI
35
36
Institut za ispitivanje materijala a. d. Beograd
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
Lj. Miličić, A. Mitrović, M. Zdujić, D. Nikolić
STRENGTHS OF THE MORTARS CONTAINING AMORPHOUS
KAOLIN AS CEMENT REPLACEMENT MATERIAL
5th International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD), 971-976.
The amorphous kaolin, obtained by mechanochemical treatment of kaolinite
clay, was used as cement replacement material in the mortars. Technology for
obtaining amorphous kaolin was developed in IMS institute with the goal to
produce new pozzolanic material which satisfies technical, ecological and
economical requirements for supplementary cementitous materials. Main
advantages of amorphous kaolin are high pozzolanic activity of 14 MPa, high
specific surface area of 21.75 m2/g, and mean particle size of 6.35 g/cm3. In
order to verify its behaviour in mortars flow, density in the fresh and hardened
state, flexural and compressive strengths obtained after 28 day of air-curing or
autoclaving were determined. Compressive strengths, especially those obtained
on autoclaved samples, indicates possibility of 50% cement reduction in
mortars. To optimize possible cement replacement ratio hidrated lime or water
glass must be added to the mix to surpass deficit in calcium hydrohide (lime)
available to react with pozzolan.
Keywords: Amorphous kaolin; mortars; strength.
A. Mitrović, Lj. Miličić, M. Zdujić
AMORPHOUS KAOLIN AS CEMENT REPLACEMENT MATERIAL
International Conference Contemporary Achievements in Civil Engineering
2014, Subotica, 24 and 25th of April 2014, 483-488.
Searching for lower cost building materials with lower environmental impact,
researchers from Institute IMS made a new pozzolanic material „amorphous
kaolin“ (AK). AK, has high pozzolanic activity of 14 MPa and high specific
surface area of 21.75 m2/g. In order to verify its application as cement
Pregled naučnih i stručnih rezultata u 2014. godini
37
replacement material in mortars, effects of many factors, such as AK
replacement of cement, W/b ratio, addition of hydrated lime or water glass, and
curing regime were investigated.
Keywords: Pozzolans, amorphous kaolin, mortars, strength.
38
Institut za ispitivanje materijala a. d. Beograd
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U IZVODU (M34)
Lj. Miličić, A. Mitrović, M. Zdujić, D. Nikolić
STRENGTHS OF THE MORTARS CONTAINING AMORPHOUS
KAOLIN AS CEMENT REPLACEMENT MATERIAL
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 971-976.
The amorphous kaolin, obtained by mechanochemical treatment of kaolinite
clay, was used as cement replacement material in the mortars. Technology for
obtaining amorphous kaolin was developed in IMS institute with the goal to
produce new pozzolanic material which satisfies technical, ecological and
economical requirements for supplementary cementitous materials. Main
advantages of amorphous kaolin are high pozzolanic activity of 14 MPa, high
specific surface area of 21.75 m2/g, and mean particle size of 6.35 g/cm3. In
order to verify its behaviour in mortars flow, density in the fresh and hardened
state, flexural and compressive strengths obtained after 28 day of air-curing or
autoclaving were determined. Compressive strengths, especially those obtained
on autoclaved samples, indicates possibility of 50% cement reduction in
mortars. To optimize possible cement replacement ratio hidrated lime or water
glass must be added to the mix to surpass deficit in calcium hydrohide (lime)
available to react with pozzolan.
Keywords: Amorphous kaolin; mortars; strength.
Pregled naučnih i stručnih rezultata u 2014. godini
T 220
CIVIL ENGINEERING,
HYDRAULIC ENGINEERING,
OFFSHORE TECHNOLOGY,
SOIL MECHANICS
T 220
GRAĐEVINARSTVO,
HIDRAULIKA,
PRIOBALNA
TEHNOLOGIJA,
MEHANIKA TLA
39
40
Institut za ispitivanje materijala a. d. Beograd
RAD U VRHUNSKOM MEĐUNARODNOM
ČASOPISU (M21)
D. Berisavljević, Z. Berisavljević, V. Čebašek, N. Šušić
CHARACTERISATION OF COLLAPSING LOESS BY SEISMIC
DILATOMETER
Engineering Geology, 2014, Vol.181, 180-189.
Structural collapse and sudden volume changes represent a major geotechnical
issue, particularly in loess soils. There are different criteria for assessing
collapse potential based on laboratory test results, which require the collectionof
undisturbed samples from test pits. This can be a complicated and costly
procedure, often financially unjustified for smaller projects. This paper presents
the results of seismic dilatometer tests (SDMT) performed at a single location in
a loess soil in Belgrade, in addition to the results of single oedometer collapse
tests performed on high quality samples from test pits.
After comparing laboratory test results it was possible to determine that in
samples collected from boreholes, dry unitweight is approximately 20% higher
than in block samples taken fromtest pits,while moisture content is between 1
and 4% higher. Unitweight estimated from DMT is on average 15% higher than
the unit weight obtained from block samples.
The constrained modulus (MDMT) determined by DMT are highly
compatiblewith oedometer modulus (Eoed) obtained from samples at natural
moisture content. This paper presents two possible ways of identifying
collapsing loess based on intermediate DMT parameters and the ratio of
G0/MDMT.
The tests results indicate that if the ratio between the material index (ID) and the
horizontal stress index (KD) is greater than 5, the danger of collapse is
imminent. Simultaneous observation of the changes of ID and KD with depth on
a semi-log graph in the same scale is recommended. In thisway the relative
distance between themmay be clearly noticed; the larger the distance becomes,
the greater the risk of collapse. In the collapsing loess ratio G0/MDMT is found
to be higher than 21 for KD less than 0.6,while in non-collapsing loess G0/MDMT
Pregled naučnih i stručnih rezultata u 2014. godini
41
is less than 21 for higher values of KD. In terms of DMT, loess is considered as
underconsolidated soil, which is one of the most common “definitions” of loess.
Keywords: loess, collapse, constrained modulus, intermediate parameters,
seismic dilatometer.
42
Institut za ispitivanje materijala a. d. Beograd
RAD U ISTAKNUTOM MEĐUNARODNOM
ČASOPISU (M22)
J. Ćirilović, N. Vajdić, G. Mladenović, C. Queiroz
DEVELOPING COST ESTIMATION MODELS FOR ROAD
REHABILITATION AND RECONSTRUCTION - CASE STUDY:
PROJECTS IN EUROPE AND CENTRAL ASIA
ASCE Journal of Construction Engineering and Management, 2014, Vol. 140,
Issue 3, 04013065.
This paper presents the development of prediction models for the unit costs of
road works that could be applied to strategic planning of road works at the
network level. A specialized data set was used, which was generated under a
World Bank study that included 200 road work contracts from 14 countries in
Europe and Central Asia (ECA) and signed between 2000 and 2010. Two
techniques were used for model development: multiple regression analysis and
artificial neural networks. Classification trees were used as an intermediate step
to evaluate the correctness of the selected parameters. A total of 19 variables,
divided into three groups (oil-price related, country-related, and project-related
variables), were tested for their influence on unit cost of asphalt concrete (AC)
and road rehabilitation and reconstruction (RRR) costs. The analysis results
showed that the level of corruption and the economic environment in a country
have a significant effect on both costs of AC and RRR. The resulting models
could be particularly useful for the planning and optimization of work on road
networks in ECA countries. However, the approach and methodology used for
model developments may be applied generally
Keywords: construction costs; maintenance costs; reconstruction;
rehabilitation; neural networks; correlation; regression analysis; regression
models; highways and roads; statistics; cost and schedule.
Pregled naučnih i stručnih rezultata u 2014. godini
43
RAD U MEĐUNARODNOM ČASOPISU (M23)
Z. Berisavljević, D. Berisavljević, V. Čebašek
SHEAR STRENGTH PROPERTIES OF DIMITROVGRAD FLYSCH,
SOUTHEASTERN SERBIA
Bulletin of Engineering Geology and the Environment, 2014.
DOI: 10.1007/s10064-014-0678-5
Flysch deposits are common in Serbia. Approximately 15 % of the 250 km of
highways currently under construction will be constructed in flysch. In the most
southern part of the E80 project, close to the border crossing with Bulgaria,
construction of 3-km long cuts, often over 30 mhigh, is foreseen by the design.
The geology of this part of Serbia is mainly characterized by flysch deposits
represented by a sequence of sandstone and siltstone, interchanging in different
proportions. After excavation of a majority of the cuts, several slopes suffered
from global and structural instabilities. This required re-design of one part of
the cuts. For this purpose, a geological strength index (GSI) was estimated and
the structural features of rock discontinuities were observed on the faces of the
surface excavations. This information and data obtained from laboratory testing
enabled the determination of five characteristic rock mass types. For every type,
shear strength properties were determined based on three criteria: the Hoek–
Brown failure criterion; the Mohr–Coulomb criterion; and an hyperbolic
nonlinear envelope. During the process of converting the Hoek–Brown
parameters to the parameters of hyperbolic envelope, the Levenberg–Marquardt
algorithm (LMA) was utilized to solve for the nonlinear regression problem.
Verification of the parameters was performed on several examples. The median
angle pressure increases exponentially with the GSI value and ranges between
the value characteristic for clays and well-graded gravel. The maximum angle
difference is obtained for a GSI value of 30. The average normal effective stress
acting on the failed slopes, expressed in the form of the stress level ratio (SLR),
is below 0.5. This indicates that the curved part of the shear strength envelope is
utilized during the shearing. As such, the linear segment overestimates the shear
strength.
Keywords: road cut, GSI, shear strength, nonlinear envelope.
44
Institut za ispitivanje materijala a. d. Beograd
RAD U ČASOPISU MEĐUNARODNOG
ZNAČAJA (M24)
K. Đoković, D.Rakić, M. Ljubojev
ESTIMATION COMPACTION PARAMETERS OF SOIL BASED ON
ATTERBERG LIMITS
Journal of Mining and Metallurgy Engineering, Bor, 2014, Vol. 4/2013, 1-8.
This paper presents relationship between the Atterberg limits and soil
compaction parameters obtained correlation- regression analysis. The relations
between the liquid limit wl, the plastic limit wp, maximum dry density dmax
and optimum moisture content wopt are obtained based on the results of
laboratory tests measured on a large number of samples of clay core earthfill
dams Rovni, Selova, Prvonek and Barje. The regression and correlation analysis
were obtained empirical equations and diagrams. Based on the equations can
estimate the value of the optimum moisture content and maximum dry density
of knowledge of Atterberg limits of plasticity.
Keywords: compaction parameters, maximum dry density, optimum moisture
content, Atterberg limits, liquid limit, plastic limits, regression analysis.
Pregled naučnih i stručnih rezultata u 2014. godini
45
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
M. Prica, K. Đoković, N. Šušić, D. Berisavljević
APPLICATION THE SCREW PLATE LOAD TEST (SPLT) TO
DETERMINING GEOTECHNICAL PARAMETERS OF SOILS
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 1873–1879.
The screw plate load test is one of the in-situ tests for the estimation of
geotechnical parameters of soils. The screw plate is basically a single cycle of a
spiral auger, which is inserted into the soil medium and successfully carried out
in the test boreholes over 2 m deep. Equipment for performing this test were
designed and made in the IMS Institute in accordance with the requirements
defined by the Russian standard GOST 20276-99.This paper presents an
overview of our experience in conducting screw plate load tests. To our
knowledge, no such tests have been carried out in our region before.
Keywords: screw plate, in situ tests, modulus of deformation.
K. Đoković, J.Ćirilović, N. Šušić, G. Hadži-Niković
APPLICATION OF REGRESSION ANALYSIS FOR PREDICTION OF
COMPACTION PARAMETERS OF CLAY SOILS
4th Simposium of Macedonian Association for Geotechnics, Struga,
Macedonia, 2014, 169-176.
The paper presents an application of regression analysis for the estimation of
the compaction parameters (maximum dry density MDD and optimum moisture
content OMC) from index properties of the soils: liquid limit LL, plastic limit
LP and plasticity index PI, obtained through Atterberg’s test. The data collected
from laboratory tests measured on representative samples of clay from core of
earthfill dams Rovni, Selova, Prvonek and Barje, were used for the estimation
of soil compaction parameters. The resulting models can be used to estimate
compaction parameters: (i) in the preliminary stages of the project development,
46
Institut za ispitivanje materijala a. d. Beograd
or (ii) in course of the preliminary assessment of suitability of a material from
borrow pits for use in earthfill structures.
Key words: maximum dry density, optimum moisture content, liquid limit,
plastic limits, regression analysis.
M. Prica, K. Đoković, N. Šušić, D. Berisavljević
SOME EXPERIENCE IN PERFORMING IN SITU TEST SCREW
PLATE LOAD TEST (SPLT)
4th Simposium of Macedonian Association for Geotechnics, Struga,
Macedonia, 2014, 217-222.
This paper presents an overview of our experience in conducting screw plate
load tests. The screw plate load test is a field test for determining deformation
properties of soils. Unlike the “classical” tests using a circular plate which can
be performed on terrain surfaces only, the screw plate load test can be
successfully carried out in the test boreholes over 2 m deep.
Keywords: screw plate, in situ tests, modulus of deformation.
G. Hadži-Niković, L. Čaki, K. Đoković
THE FITTING PARAMETER K FOR PREDICTING UNSATURATED
SHEAR STRENGTH FOR LOESS SEDIMENTS IN BELGRADE AREA
4th Simposium of Macedonian Association for Geotechnics, Struga,
Macedonia, 2014, 259-266.
There are several semi-empirical shear strength equations in the literature to
predict the shear strength of unsaturated soils which use the soil-water
characteristic curve - SWCC- and effective shear strength parameters c’ and ’,
but some of them need the fitting parameter K . There is relationship between
the fitting parameter K and index plasticity Ip, in the literature, obtained on the
basis of the available experimental results on statically compacted specimens.
However, it is usefull and recommended to check validity of that relatioship and
determine the fitting parameter K in all special case. In this study the fitting
parameter K was determined for unsaturated loess soils of Belgrade sediments
at Pregrevica location, obtained from results of experimentaly testing. The
Pregled naučnih i stručnih rezultata u 2014. godini
47
presented results are consistent with the earlier proposed K vs Ip relationship
and confirm the importance of experimental testing for correct using proposed
relationship.
Keywords: the fitting parameter, unsaturated shear strength, matric suction,
loess sediments, SWRC.
D. Rakić, N. Šušić, I. Basarić, K. Đoković, D. Berisavljević
LOAD TEST OF LARGE DIAMETER PILES FOR THE BRIDGE
ACROSS DANUBE RIVER IN BELGRADE
XV Danube – European Conference on Geotechnical Engineering DECGE
2014, Vienna, Austria, 2014, Paper No. 111, 867-872.
The bridge over the Danube will be part of the so-called north main tangent NMT as one of the most important elements of the future road and street
network base in Belgrade. It will be the second bridge over the Danube in
Belgrade. In this paper the results of the pile load tests for the central bridge
structure foundation will be analysed, using the EC 7 standard. The length of
the test pile was 46 m and its diameter was 2.0 m. Load test was carried out
with the contra load of 2100 tons in the form of pre-stressed reinforced concrete
beam, which is founded on piles, each about 60 m. For the realization of a
vertical pressing force to the pile head, five hydraulic presses were used, that
were securing the force from 3000 to 6000 kN.
Keywords: pile, static pile load test, EC 7 standards, geotechnical conditions.
N. Šušić, M. Živanović
COMPARATIVE ANALYSIS OF REINFORCED CONCRETE (RC)
RETAINING WALL UNDER SEISMIC AND NON-SEISMIC
CONDITIONS
4th International Conference Earthquake Engineering and Engineering
Seismology, Bor, 2014, 383-388.
Retaining walls are civil engineering structures erected for the purpose of
securing a terrain de-leveling, thus enabling unobstructed traffic flow, existence
of free/buffer spaces between buildings, warehouses, etc. Retaining walls are
48
Institut za ispitivanje materijala a. d. Beograd
usually dimensioned to satisfy stability requirements in case of active earth
pressure action. In such cases, irrational and cost ineffective structures are
designed only too often. This paper demonstrates that, when a retaining wall is
dimensioned to satisfy also the stability requirements in case of earthquake, the
result is an even more irrational and cost ineffective support structure.
Keywords: retaining wall, analysis, seismic and non-seismic conditions.
J.Ćirilović, G. Mladenović, C. Queiroz
PROJECT LEVEL PAVEMENT MANAGEMENT OPTIMIZATION
PROCEDURE COMBINING OPTIMAL CONTROL THEORY AND
HDM-4 MODELS
Transportation Research Arena, Paris, France, 2014.
The paper presents an optimal control theory-based procedure for finding the
optimal timing and intensity of pavement maintenance treatments, which was
adjusted based on the models for pavement deterioration and road user costs
from the HDM-4 and RUCKS models. The model for improvement in
pavement condition after a maintenance treatment was calibrated according to
Paterson’s bilinear model. The closed-form solution is then compared to the
solution obtained by using genetic algorithms (GAs). In both methodologies
special attention was given to the quality of the “optimal” solution in terms of
evaluating: (i) the time between the maintenance treatments; (ii)
minimal/maximal thicknesses of overlays calculated in the optimal maintenance
plan; and (iii) parameters defining pavement condition before and after the
maintenance treatment. The comparison between the two methodologies
allowed analyzing limitations in each one of them and led to improvements in
the “optimal” solution.
Keywords: optimal pavement maintenance plan, optimal control theory,
genetic algorithms, HDM-4; RUCKS.
Pregled naučnih i stručnih rezultata u 2014. godini
49
J.Ćirilović, G. Mladenović, C. Queiroz
APPLICATION OF GENETIC ALGORITHMS FOR PAVEMENT
MAINTENANCE OPTIMIZATION
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD).
Finding the optimal pavement maintenance strategies is one of the key problems
in the field of Road Infrastructure Management. This paper shows an example
of the methodology for solving the above-mentioned optimization problem
using genetic algorithms (GA). Four models were calibrated: (i) the model
estimating the effects of maintenance treatments; (ii) pavement deterioration
model; (iii) model estimating the maintenance cost; and (iv) road users cost
estimation model, and the advantages and disadvantages of the use of the
method of GA are highlighted.
Keywords: optimal pavement maintenance plan, genetic algorithms, HDM-4.
G Mladenović, J. Ćirilović
PERMANENT DEFORMATION OF RUBBER MODIFIED ASPHALT
MIXTURES
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD).
Increasing traffic loading, as well as increasing summer extreme temperatures
reinforce the focus on the demands for quality and durability of asphalt
pavements. At the same time, the focus is directed to sustainable development,
use of waste materials and saving of natural resources. The study included
testing of five asphalt mixtures with neat and modified bitumen, with two
different contents of ground rubber and rubber modifier. Mixture with neat
bitumen B 50/70 showed the lowest resistance to permanent deformation, while
the mixtures with addition of rubber showed superior performance, even
compared with the mixtures with polymer modified bitumen.
Keywords: asphalt mixtures, rubber, permanent deformation.
50
Institut za ispitivanje materijala a. d. Beograd
RAD U ČASOPISU NACIONALNOG
ZNAČAJA (M52)
N. Šušić, G. Hadži-Niković G., K. Đoković
BEARING CAPACITY OF PILES ESTIMATE DIFFERENCES
Journal of Faculty of Civil Engineering, special edition International
Conference Contemporary Achievements in Civil Engineering E.III, 2014, 259264.
Methods that have been used in determining the bearing capacity of piles are
not entirely reliable given the variability of the parameters involved. Most of the
methods used are based on theoretical models of the lowest reliability degree.
Pile loading tests give a more realistic idea of the pile behaviour under load. In
addition, ultimate bearing capacity obtained by pile loading test may be used to
calculate the allowable loading intensity at a reasonable factor of safety.
Keywords: piles, bearing capacity of pile, theoretical model, pile loading test.
Pregled naučnih i stručnih rezultata u 2014. godini
T 230
BUILDING CONSTRUCTION
T 230
VISOKA GRADNJA
51
52
Institut za ispitivanje materijala a. d. Beograd
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
D. Stanojlović
ANALYSIS OF THE SUCCESS OF MASS CONSTRUCTION
PROJECTS IN VIEW OF COST DISTRIBUTION
14th Conference of the Association of Structural Engineers of Serbia, Novi Sad,
2014, 245–252.
This paper analyses the relation of cost distribution and success of construction
projects by testing the rule of thumb: successful projects have ¼ of costs placed
in the first third, ½ of the costs in the second, and remaining ¼ of the costs
placed in the last third of the project. Hypothesis has been tested at 88,64%
construction projects within Stepa Stepanović Complex, Belgrade. The results
of research have shown a strong negative correlation among the percent of cost
in the second third of the project and the delay in its execution. Likewise, there
is a strong negative correlation between the percent of cost in the first and last
third of the project.
Keywords: “the rule of thumb”, cash flow, cost distribution, Stepa Stepanović.
G. Petrović, B. Ivanković
THE APPLICATION OF THE IMS BUILDING TECHNOLOGY IN THE
XXI CENTURY
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 533-540.
IMS Building Technology is an advanced system for industrialized building,
based on prefabricated reinforced concrete elements, assembled using posttensioning. It has been in use since 1957 in former Yugoslavia and worldwide,
enabling the construction of contemporary-designed residential buildings.
Through the joint effort of all the parties involved in future projects, it is
possible to implement the IMS Building Technology and improve the overall
quality and affordability of housing.
Pregled naučnih i stručnih rezultata u 2014. godini
Keywords: Industrialization
prestressing, prefabrication.
of
building,
IMS
53
Building
Technology,
G. Petrović, M. Aleksendrić
THE IMPACT OF SMART HOME TECHNOLOGIES ON
ARCHITECTURAL DESIGN
1st International Academic Conference On Architecture, Belgrade, 3-4 April
2014, (CD) 822-829.
The house is a machine for living. Technological development changes our
homes, as they need to accommodate various advanced systems for
management of lighting, heating, ventilation and air conditioning, surveillance
and security, shading, multimedia entertainment, all aiming to provide both
comfort and energy savings. An architect today should at least be acquainted
with the multidisciplinary approach to designing a smart space. Domotics is not
the option to automatically perform certain functions in space, it is the ability to
control the space itself, with all the amenities that this approach offers. The role
of an architect in this case is double: To inform the client of the possibilities that
the system offers and to give the system designer sufficient information about
the client’s needs. Therefore, the role of an architect is central and crucial:
Although both the user’s demands and the smart technology are changing
rapidly, he still has to be the intermediary between the world of users and the
world of technology. And still, new technologies serve to improve the overall
quality of the designed space, not vice versa.
Keywords: Home Automation, Domotics, Habitation, Interior Design, Energy
Efficiency.
54
Institut za ispitivanje materijala a. d. Beograd
RAD U ČASOPISU NACIONALNOG
ZNAČAJA (M52)
G. Petrović, N. Milovanović
RECENT RESEARCH WORK RESULTING IN IMS BUILDING
TECHNOLOGY IMPROVEMENTS
Sixt edition of the research conference on civil engineering, economy of
constructions, architecture, urban planning and territorial development,
Bucharest, 2013, published in Constructii, 2014, Vol.14, No. 2, 21-24.
IMS Building Technology is based on prefabricated concrete elements of the
structure, assembled on-site and joined using prestressing. This construction
method, developed in 1950s and implemented worldwide, is still in use. This
paper describes recent improvements and the research work that initiated and
enabled them, as well as on-site experiences from the process of
implementation.
Keywords: industrialization
prestressing, prefabrication.
of
building,
IMS
Building
Technology,
Pregled naučnih i stručnih rezultata u 2014. godini
T 450
METAL TECHNOLOGY,
METALLURGY,
METAL PRODUCTS
T450
TEHNOLOGIJA METALA,
METALURGIJA,
PROIZVODI OD METALA
55
56
Institut za ispitivanje materijala a. d. Beograd
RAD U ISTAKNUTOM MEĐUNARODNOM
ČASOPISU (M22)
A. S. Tawengi, A. Sedmak ,V. Grabulov
COLD WELD CRACKING SUSCEPTIBILITY OF HIGH STRENGTH
LOW ALLOYED (HSLA) STEEL NIONIKRAL 70
Metallurgy, 2014, Vol. 53, No 4, 624-626.
In view of the importance of high strength low alloy (HSLA) steels, particularly
for critical applications such as offshore plat forms, pipeline and pressure
vessels, this paper reports on an investigation of how to weld this type of steel
without cold cracking. Using manual metal arc welding process and Tekken test
(Y - Grove test) has been carried out both to observe the cold cracking phenome
non, and to investigate the influencing factors, such as preheating temperature
and energy input, as well as electrode strength and diameter. How ever the
results of the experiments show that there is a risk of cold cracking.
Keywords: HSLA steel; weld metal; cold cracks; hardness; Heat Affected Zone
(HAZ).
M. Burzić, M. Manjgo, J. Bernetič, Z. Burzić, M. Arsić
EFFECT OF VARIABLE LOAD ON CRACK INITIATION
MICROALLOYED STEEL S 690 - QL
Metallurgy, 2015, Vol. 54, No. 1, 55-58.
The accumulation of damage in the form of initiation and growth of microcracks is the first stage of destruction that ends when the merger microcracks
form macro cracks. Cracks formed in the cycle number N =104 - 105 are the
result of low cycle fatigue. From the need to evaluate low cycle fatigue life was
carried out to investigate the low cycle fatigue microalloyed high-strength steel
S690QL in the heat-treated.
Keywords: microalloyed steel S690QL, low cycle fatigue, cracks, strain
amplitude.
Pregled naučnih i stručnih rezultata u 2014. godini
57
RAD U MEĐUNARODNOM ČASOPISU (M23)
D. Veljić, A. Sedmak, M.Rakin, N.Bajić, B.Međo, D. Bajić, V. Grabulov
EXPERIMENTAL AND NUMERICAL THERMO - MECHANICAL
ANALYSIS OF FRICTION STIR WELDING OF HIGH - STRENGTH
ALLUMINIUM ALLOY
Thermal Science, 2014, Vol. 18, Issue Supplement, S29 - S38.
DOI REFERENCE: 10.2298/TSCI130512171V
This paper presents experimental and numerical analysis of the change of
temperature and force in the vertical direction during the friction stir welding of
high-strength aluminium alloy 2024 T3. This procedure confirmed the
correctness of the numerical model, which is subsequently used for analysis of
the temperature field in the welding zone, where it is different to determine the
temperature experimentally. 3D finite element model is developed using the
software package Abaqus; arbitrary Lagrangian-Eulerian formulation is applied.
Johnson-Cook material law and Coulomb's Law of friction are used for
modelling the material behaviour. Temperature fields are symmetrical with
respect to the welding line. The temperature values below the tool shoulder, i. e.
in the welding zone, which are reached during the plunge stage, are
approximately constant during the entire welding process and lie within the
interval 430-502 °C. The temperature of the material in the vicinity of the tool is
about 500 °C, while the values on the top surface of the welding plates (outside
the welding zone, but close to the tool shoulder) are about 400 °C. The
temperature difference between the top and bottom surface of the plates is
small, 10-15 °C.
Keywords: friction stir welding, aluminium alloys, finite element analysis,
temperature fields, thermo-vision measurement.
58
Institut za ispitivanje materijala a. d. Beograd
I. Radisavljević, A. Živković, N. Radović, V. Grabulov
INFLUENCE OF PIN GEOMETRY ON MECHANICAL AND
STRUCTURAL PROPERTIES OF BUTT FRICTION STIR WELDED
2024-T351 ALUMINUM ALLOY
Hemijska industrija, 2014, Vol. 68.
DOI:10.2298/HEMIND131206020R
The aim of this work was to investigate the combined effect of small difference
in pin geometry, together with rotation and welding speed on the weldability,
mechanical and structural properties of FSW 2024-T351 Al plates. The only
difference in tool pin design was the shape of thread: regular and rounded.
Specimens were welded using rotation rate of 750 rev/min and welding speeds
of 73 and 93 mm/min. In all four cases, specimens were defect free, with good
or acceptable weld surface. Modification in pin design showed strong influence
on macro structure and hardness distribution. Weak places are identified as low
hardness zone, close to the nugget zone and are in good agreement with fracture
location in tensile testing. Weld efficiency, as a measure of weld quality, are
better in case of 310 tool, while UTS values can differ up to 13% for the equal
welding parameters. Therefore, it can be assumed that small modification in
tool design, particularly in pin geometry, can have great influence on weld
formation and mechanical properties.
Keywords: Friction Stir Welding, pin geometry, weld quality, Al alloy 2024,
heat input.
M. B. Đurđević, S. Manasijević, Z. Odanović, N. Dolić
QUANTIFICATION OF THE COPPER PHASE(S) IN AL-5SI-(1-4)CU
ALLOYS USING A COOLING CURVE ANALYSIS
Materiali in tehnologije, 2014, Vol. 48, No. 2, 299-304.
The aim of this paper is to demonstrate that it is possible to characterize the
development and quantify the area percentage of Cu-enriched phases in Al-5Si(1-4)Cu alloys by applying a cooling-curve analysis. It is shown that several
distinct Cu-enriched phases are manifested as peaks on the first derivative of the
cooling curve. The total area percentage of the Cu-enriched phases is defined as
the ratio of the area between the first derivative of the cooling curve and the
Pregled naučnih i stručnih rezultata u 2014. godini
59
hypothetical solidification path of the Al-Si-Cu eutectic to the total area
between the first derivative of the cooling curve and the base line. These
calculations, based on the cooling curve analyses, are compared with the imageanalysis and chemical-analysis results in order to verify the proposed method.
There is a good correlation between the measured and calculated values for the
area of the Cu-rich phase in Al-5Si-(1–4)Cu alloys.
Keywords: aluminum alloys, thermal analysis, cooling-curve analysis, image
analysis.
M. B. Đurđević, Z. Odanović
ANALYSIS OF THE SOLIDIFICATION PATH OF AL-SI9-CU(1-4)
ALLOYS USING THERMAL ANALYSIS TECHNIQUE
La Metallurgia Italiana, 2014, Vol. 106, No. 9, 23-29.
The present work displays the potential of cooling curve analysis to characterize
the solidification path of Al-Si9-Cu(1-4) alloys. In additions the possibility of
quantifying the Cu enriche phases in these alloys by using thermal analysis
(TA) technique has been investigated. The proposed methodology is based on
the following procedure: a total amount of the Cu enriched phases is defined as
the ratio of the area between the first derivative of the cooling curve and the
hypothetical solidification path of the Al-Si-Cu eutectic to the total area
between the first derivative of the cooling curve and the base line. These
calculations based on the cooling curve analyses are compared with Image
Analysis (IA) and chemical analysis results in order to verify the proposed
method. There is a good correlation between measured and calculated values for
the area of Cu rich phase of the Al-Si9-Cu(1-4) alloys.
Keywords: Al alloys - Cu rich phase - Thermal analysis - Thermal freezing
range.
60
Institut za ispitivanje materijala a. d. Beograd
RAD U ČASOPISU MEĐUNARODNOG
ZNAČAJA (M24)
M. Arsić, S. Bošnjak, V. Grabulov, A. Veljović, Z. Savić
ANALYSIS OF CURRENT STATE AND INTEGRITY EVALUATION
FOR THE SUPPLY TANK OF GENERATION UNIT 6 OF THERMAL
POWER PLANT NIKOLA TESLA ”A”
Advanced Materials Research, 2014, Vol. 1029, 14-19.
DOI:10.4028/www.scientific.net/AMR.1029.14
Stable supply tank, with volume V = 250 m3 and operating pressure p = 1,5
MPa, of generation unit 6 at thermal power plant 'Nikola Tesla A' in Obrenovac
is designed for water-steam working fluid. It was made of steel Č 1204 as a
single-part welded structure with a single wall. Cylindrical tank shell consists of
8 segments, while torispherical deep bottoms consist of 3 segments. The tank is
in the horizontal position and it lays on 4 supports. There are five manometers
installed at the tank for pressure control, as well as 5 spring-loaded safety
valves.
In this paper results of non-destructive tests performed on the tank are
presented. Mechanical damages on parent material, up to 1.5 mm deep, were
detected at the outer surface of the cylindrical section of the right bottom (as
seen from the boiler) and on the inner surface of the shell, as well as sporadic
pitting corrosion, up to 0.5 mm deep, and 2 mm misalignment of sheet metals in
areas where shell segments are joined. Crack type linear indications were
detected on the surface of welded joints by magnetic particle testing. By
ultrasonic and radiographic testing it was determined that the homogeneity of
welded joints is satisfactory. Hardness testing was performed on all segments of
the tank, and obtained values were in the range between 118 and 130 HB. On
the basis of test results the repair technology for shell and bottom segments was
made, while on the basis of the analytical calculation of tank strength the
integrity evaluation was carried out for the upcoming period of service,
depending on the category of the vessel.
Keywords: supply tank, tests, damage repair, strength calculation, integrity
evaluation.
Pregled naučnih i stručnih rezultata u 2014. godini
61
M. Arsić, B. Vistać, S. Bošnjak., V. Grabulov, Z. Savić
METHODOLOGY FOR REPARATION OF DAMAGED SLEEVES AND
WELDED SHIED SECTIONS OF GUIDE VANES AT HYDROPOWER
PLANT DJERDAP 1
Advanced Materials Research, 2014, Vol. 1029, 8-13.
DOI:10.4028/www.scientific.net/AMR.1029.14
Vertical Kaplan turbines, manufactured in Russia and with nominal power of
200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’.
During the refurbishment of hydropower plant experimental non-destructive
tests were performed in order to determine the state of turbine components.
During the course of testing damage was detected at sleeves and welded shields
of guide vanes, which occurred as a consequence of turbine shaft vibrations.
1782 mm long guide vane sleeves were made of cast steel 25L (GOST
standard), 260 mm long sleeve was made of forged steel St 25 (GOST
standard), while welded shields of guide vanes were made of austenitic steel
08X18H10T (GOST standard).
Results of experimental tests and methodology for reparation of damaged
surfaces of sleeves and welded shields of guide vanes are presented in this
paper. It was necessary, due to the structural solution used for the design of
guide vanes and their function during service, to define a large number of
details, carefully reconsider them and carry out all activities with extreme care
in order to enable the safe operation and continuous use of vanes through the
use of reparation methodology for welding/surface welding of sleeves and
welded shields. Overlooking, underestimation or incorrect perception of
important details could cause significant problems during turbine operation.
Keywords: hydro turbine, crank, sleeve, damage, reparation methodology.
D. Momčilović, A. Subić, I. Atanasovska, R. Mitrović
COMBINED LOAD SIMULATION VS. COMPONENT LOADS
SIMULATION IN MACHINE DESIGN – A CASE STUDY
FME Transactions, Vol. 42, No. 1, 2014, 48-55.
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Institut za ispitivanje materijala a. d. Beograd
At a present level af technology, almost all machine parts are subjected to
combined loads in real working condition. The aim of research described in this
paper is to highlight the importance of combined load simulation for the
calculation of machine parts load capacity. This research is inspired by one
failure case study of hydro turbine shaft. The shaft with flange and high ratio of
shaft/flange diameter is the subject of excessive calculation in order to find the
cause of failure.
The classic analytical calculation of this shaft uses the Peterson's elastic stress
concentration factor and calculates stress concentration factors and maximum
stresses for different stress components of combined load and then calculate
analytical values of total stress by the hypothesis of maximum normal stress. On
the other hand, presented Finite Element Analysis simulates shaft stress state
under real conditions of complex load by simultaneously applying all load
components (bending, torsion and tension). Bboth of the calculations are
performed for few different radii in shaft-flange sections.
The results are presented by comparative diagrams for obtained values of total
stresses and stress concentration factors. The analysis of these diagrams leads to
conclusion that the use of Peterson’s stress concentration factors and standard
analytical techniques for total stress calculation has to be replaced with modern
calculation techniques that provide a more accurate, easier-to-handle solution.
Keywords: stress concentration factor, Finite Element Analysis, shaft.
Pregled naučnih i stručnih rezultata u 2014. godini
63
PREDAVANJE PO POZIVU SA
MEĐUNARODNOG SKUPA ŠTAMPANO U
CELINI (M31)
V. Grabulov
THE METHODOLOGY OF EVALUATING OF LOADING RATE
EFFECT ON FRACTURE RESISTANCE OF HIGH STRENGHT
STEELS AND THEIR WELDMENTS
VIth International Metallurgical Congress Ohrid 2014, May 29 – June 01, 2014,
Ohrid, FYR Macedonia, CD, 1-6.
The application of high strength steels is limited by their formability. The most
often used method of forming of these steels is welding. Thus, the application of
high strength steels for welded structures depends, besides other factors, on
properties of their welded joints. One of the most important requirements for
service safety of welded structures, produced of high strength steel, is to
achieve corresponding level of toughness in all three welds constituents: base
metal (ΒΜ), weld metal (WM) and heat affected zone (ΗΑΖ). The evaluation
of welds toughness is very complex, because of microstructures heterogeneity
of WM and ΗΑΖ, as well as the heterogeneity of their mechanical properties.
Charpy test, although very old method is generally accepted for the evaluation
of the impact toughness due to its simplicity. Recently developed
instrumentation of Charpy test significantly extended its capacity, enabling not
only the separation of energy portions required for crack initiation and crack
propagation, but also the evaluation of loading during the fracture process.
Specifications for heavy loaded welded structures normally include impact
energy values for ΒΜ and WM, as well as transition temperature when service
at low temperature is expected. However, there is still the problem how to
evaluate toughness of ΗΑΖ, since it is difficult to position notch root precisely
in ΗΑΖ region of lowest toughness. In order to establish more severe testing
loading, explosion crack starter test had been introduced. Applied to welded
joint specimens, this test enables to determine the most critical region in welds,
in which fracture would occur. On this way by the global test critical local
property could be defined. Further improvement in crack resistance testing is
offered by introduction of fracture mechanics tests, which involved pre-cracked
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Institut za ispitivanje materijala a. d. Beograd
specimens. The application to welded joints allows for convenient
determination of crack resistance of BM and WM, but it is followed again by
uncertainty in defining of critical crack tip position in HAZ, since in prescribed
preparing method fatigue crack would follow the path of notch root rather than
direction of critical HAZ region. The application of all three above described
methods for the evaluation of brittle behavior of welded joints, performed of
high strength pressure vessels and ship buildings steels and their weldments
welded by manual arc welding process, are presented in the paper.
Keywords: Brittle behavior, transition temperatures, crack initiation, crack
propagation, explosive bulge test.
Pregled naučnih i stručnih rezultata u 2014. godini
65
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
M. Arsić, M. Mladenović, Z: Kovačević, Z. Savić, Z. Šarkoćević
ANALYSIS REGARDING THE CAUSES OF DAMAGE OCCURRENCE
AT RUNNER BLADES AND RUNNER SHIELD OF HYDROELECTRIC
GENERATING SET A6 AT HPP DJERDAP 1
VIth International Metallurgical Congress Ohrid 2014, May 29 – June 01, 2014,
Ohrid, Republic of Macedonia, CD, 1-5.
Vertical Kaplan turbines, manufactured in Russia and with nominal power of
200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’.
Most of the parts were made of materials in accordance with GOST and ASTM
standards. During the refurbishment of hydroelectric generating unit A6 the
analysis of current state and integrity evaluation were performed for 2 runner
blades and runner shield at which damage that has to be repaired was detected,
because hydroelectric generating sets are being projected for the service life of
40 years due to structural solutions and limited possibilities of performing
periodic inspections. Runner blades were, according to the Manufacturer’s
documentation, made of steel 08H14NDL, while runner shield was made of
steel St3/0H13, in accordance with GOST standard. Stresses in components and
structures of turbine and hydro mechanical equipment occur during the process
of fabrication and assembly of equipment (residual stresses), during the process
of performing functional tasks in exploitation (stationary and dynamic loading)
and during the disturbed process of exploitation (non stationary dynamic
loading). With unpredictable influence of corrosion, erosion and cavitation also
taken into account, it is clear that it’s not a simple task to determine causes of
damage occurrence at some components and structures.
This paper contains results of non-destructive tests, as well as of metallographic
examination, based on which it was determined that the cause of damage
occurrence at 2 runner blades and runner shield is the intrusion of a foreign
body of unknown origin during turbine operation.
Keywords: hydroelectric generating set, damage, runner blades, runner shield.
66
Institut za ispitivanje materijala a. d. Beograd
RAD U VODEĆEM ČASOPISU
NACIONALNOG ZNAČAJA (M51)
M. Rakin, B. Medjo, M. Arsić, Ž. Šarkoćević, A. Sedmak
EFFECT OF EXPLOITATION CONDITIONS AND FLAW GEOMETRY
ON THE LOAD CARRYING CAPACITY OF CASING PIPES FOR OIL
DRILLING RIGS
Key Engineering Materials, 2014, Vol. 601, 65-70.
DOI:10.4028/www.scientific.net/KEM.601.65
The subject of this work is examination of API J55 steel casing pipes
manufactured by high frequency (HF) contact welding. Since the pipes were
withdrawn after about 70 000 hours of service in an oil drilling rig, the
influence of the exploitation conditions on the material properties is determined.
Experimental analysis includes tensile, impact toughness and fatigue testing of
the specimens cut from the exploited pipe and the new pipe manufactured from
the same-grade material. Additionally, pipe with flaws (stress concentrators) is
tested by subjecting to internal pressure.
The analysed stress concentrators represent defects which are often found in the
exploitation: localized corrosion damages (corrosion pits). They were simulated
by machining on the external surface of the pipe wall. The behavior of the pipes
with these defects is determined by strain measurement and finite element
analysis in software package Abaqus. The dimensions of the defects are varied,
in order to determine the dependence of load carrying capacity on their depth
and length. Several expressions from the literature are applied for estimation of
the maximum pressure in damaged pipelines, and the solutions are compared
with the predictions of finite element models. Additionally, triaxiality values at
the bottom of the defects are compared with those obtained on tensile
specimens, having in mind the key role of this parameter in ductile fracture
initiation.
Keywords: Casing pipes, Properties degradation, Integrity assessment, Stress
concentrator, Finite element method.
Pregled naučnih i stručnih rezultata u 2014. godini
67
M. Arsić, B. Međo, V.Grabulov, Z. Savić, N. Milovanović
POSSIBILITIES OF PERFORMING ANALYSIS AND ENHANCING
THE RELIABILITY OF WELDED STRUCTURES OF TURBINE AND
HYDROMECHANICAL EQUIPMENT OF THE HYDRO POWER
PLANT DJERDAP ON THE BASIS OF FAULT TREE ANALYSIS
Energija (Energija, ekonomija, ekologija), 2014, Vol. 16, No. 1-2, 377-384.
Hydro power plant ’’Djerdap 1’’ comprises 6 hydroelectric generating sets with
vertical Kaplan turbines. Nominal output power of each is 200 MW. Hydro
power plant ’’Djerdap 2’’ comprises 10 hydroelectric generating sets with
horizontal Kaplan turbines. Nominal output power of each is 28 MW. All of the
mentioned equipment has been fabricated in Russia. During the refurbishment
of hydroelectric generating sets A4 and A6 at the hydro power plant ’’Djerdap
1’’, non-destructive and destructive tests were performed in order to analyze the
state and evaluate the reliability of welded structures, as well as in order to
determine causes of degradation of base material and welded joints of structures
of turbine and hydromechanical equipment. Welded structures of turbine shafts
at the hydro power plant ’’Djerdap 2’’ were also tested.
The qualitative and quantitative analysis of failures of welded structures that
occur due to conditions of fabrication and/or exploitation was performed
through the use of the fault tree method, which is based on results of destructive
and non-destructive tests. Analysis of individual influences showed that failure
of welded structures of turbine and hydromechanical equipment is mainly
influenced by the selection of base material and welding technology, wrong
method of calculation and shaping of structures, as well as deviation from
projected conditions of exploitation (loads, vibrations, corrosion, erosion,
cavitation...). Fault tree analysis results could be used for failure prevention and
reliability enhancement, because the method relies on diagnostic descriptions of
logistic relations between undesired events.
Key words: hydroelectric generating set, welded structure, fault tree, reliability,
database.
68
Institut za ispitivanje materijala a. d. Beograd
M. Arsić, B.Vistać, S. Bošnjak, M. Mladenović, Z. Savić
ANALYSIS OF CURRENT STATE AND INTEGRITY EVALUATION
FOR THE AIR TANK OF THE REGULATION SYSTEM OF TURBINE
A6 AT HYDROPOWER PLANT DJERDAP 1
Energija (Energija, ekonomija, ekologija), 2014, Vol. 16, No. 1-2, 385-391.
Vertical Kaplan turbines with nominal power of 200 MW, made in Russia, have
been installed at 6 hydroelectric generating sets of ’’Djerdap 1’’. Most of the
components were made of steel in accordance with GOST and ASTM
standards. During the rehabilitation of the hydroelectric generating set A6 nondestructive testing methods were performed on parent material and welded
joints of the main oil/air tank and air tank with the auxiliary oil/air tank, which
acts as pressure accumulator in the regulation system, in order to carry out the
analysis of the current state and integrity evaluation for the regulation system of
the turbine. Shells of all 3 tanks were made of steel Č 1205, while bottoms were
made of russian steel St 20K. Tests were also performed on pipeline elements
(pipes and elbows).
The results of non-destructive tests performed on air tank are presented in this
paper. Mechanical damages were detected by visual inspection at parent
material of the shell and at the upper bottom, as well as discontinuous and
incompletely welded joints on the inside and outside of the tank. Surface linear
crack type indications were detected through magnetic particle testing at
intersections of welded joints on the inside of the tank. Internal crack type
defects were detected through ultrasonic testing of welded joints
On the basis of test results the technology of reparatory welding / surface
welding of parent material and welded joints was created, while on the basis of
the analytical calculation of tank strength the evaluation of its integrity for the
following 40 years of operation was obtained.
Keywords: air tank, tests, damage repair, strength calculation, integrity.
Pregled naučnih i stručnih rezultata u 2014. godini
69
TEHNIČKA I RAZVOJNA REŠENJA (M80)
D. Veljić, N. Radović, M. Rakin, I. Radisavljević, A. Živković, V. Grabulov
TEHNOLOGIJA ZAVARIVANJA PLOČA DEBLJINE 3.0 mm
ALUMINIJUMSKE LEGURE 2024 POSTUPKOM ZAVARIVANJA
TRENJEM ALATOM
Projekat Ministarstva nauke TR 34018, Razvoj tehnologije proizvodnje i
zavarivanja Al-Mg legura visoke čvrstoće za primenu u konstrukcijama
drumskih i železničkih transportnih sredstava, Korisnik: GOŠA FOM,
Prihvaćeno od: GOŠA-FOM, 2014.
70
Institut za ispitivanje materijala a. d. Beograd
Pregled naučnih i stručnih rezultata u 2014. godini
B 003
ECOLOGY
B 003
EKOLOGIJA
71
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Institut za ispitivanje materijala a. d. Beograd
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
T. Spasojević-Šantić, G. Dražić, D. Perović
PHYTOREMEDIATION OF AGRICULTURAL LAND
CONTAMINATED WITH PESTICIDES
Ecological improvement of devastated sites for sustainable development
ECOIDS 2014, Belgrade, 2014.
Pesticides are substances intended for preventing, destroying, suppressing or
reducing pests. They are in use for more than 60 years and they are divided
according to purpose, chemical composition and toxicity category. The use of
pesticides in agriculture has positive and negative sides, both from an economic
as well as a social and environmental point of view. It is known that pesticides
through biogeochemical cycles mature to all environmental media, and even the
food chain, which explicitly has an impact on human health. Phytoremediation
is one of the natural methods used for solving the problem of the presence of
pesticides in agricultural soils, using plant species that perform stabilization and
degradation of pesticides. During the planning ecoremediation project of
degraded agricultural land, selection of phytoremediation techniques depends
on many factors, among other things, the types of contaminants and plant
species that will be used.
After examining the results of some studies, reports, and regulations, this paper
shows the importance of phytoremediation of degraded agricultural land in the
light of affordable and green technology without negative effects and products
on the environment and human health as well as appropriate techniques of
modern man who seeks to sustainable development. It is necessary to take into
consideration the use of biopesticides as alternatives to current trend of
uncontrolled use of conventional pesticides.
Keywords: pesticides, phytoremediation, sustainable development.
Pregled naučnih i stručnih rezultata u 2014. godini
P 420
PETROLOGY,
MINERALOGY,
GEOCHEMISTRY
T 150
PETROLOGIJA,
MINERALOGIJA,
GEOHEMIJA
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Institut za ispitivanje materijala a. d. Beograd
RAD U ČASOPISU MEĐUNARODNOG
ZNAČAJA (M24)
S. Dević,M.Cocić
MINERALOGICAL INVESTIGATIONS IN METALLURGY AS A
CINTRIBUTION TO THE AFIRMATION OF INDUSTRIAL
MINERALOGY IN SERBIA
Materials protection, 2014, Vol. 55, No.4.
Industrial mineralogy is a part of mineralogy dealing with natural and synthetic
minerals, raw materials, secondary raw materials, polymineral materials that
originated from the production processes, etc. As applicable, it has been used in
the refractories industry, ceramics industry, ferrous and non-ferrous metallurgy,
cement industry and other industries. The work aimed at presenting its
contribution to the affirmation of industrial mineralogy in Serbia through the
results of mineralogical investigations obtained in ferrous metallurgy and
copper metallurgy. A larger number of mineralogical investigations, carried out
on the materials being characteristic for metallurgical processes and issues of
ferrous metallurgy and copper metallurgy, have been stated in this work.
Refractory bricks, various types of slag, final flotation waste, copper
concentrate, etc. have been investigated. At the same time, the reasons and
objectives of performed mineralogical investigations have been given. The
results of mineralogical investigations have been shown in detail on two
examples. The first are associated with the problems and material in ferrous
metallurgy and the second with the material and problems in copper metallurgy.
Firstly, the results of mineralogical investigations of casting powders have been
shown. They have been investigated for verification of the quality and erosion
of the alumographite entry nozzles, that occurred due to their effect. The
investigations aimed at increasing the durability (resistance) of the
alumographite entry nozzles being utilized in the process of continuous casting
of steel. By increasing the durability of entry nozzles the production costs are
reduced. The method of X-ray diffraction analysis (XRPD) has been used for
investigating the mineralogical composition of casting powders. The results of
studying the process of copper concentrate roasting in the fluo-solid reactor
have been shown in the second example, with the aim of investigating the
Pregled naučnih i stručnih rezultata u 2014. godini
75
transformation degree of the primary ore minerals under various technological
parameters.The input material (charge) and roasting products in the reactor
(calcine) were investigated by various methods.The investigation results have
shown that reactions of mineral transformations are not completed, i.e. they are
developing only partially (12-22%), which is the consequence of insufficiently
long heating, unsuitable temperature or unfulfilled other parameters, such as for
example, a non-uniform grain size. All stated mineralogical investigations and
the results shown in this work gave a significant contribution to the affirmation
of industrial mineralogy in Serbia.
Keywords: Mineralogical investigations, Metallurgy, Industrial mineralogy.
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Institut za ispitivanje materijala a. d. Beograd
SAOPŠTENJE SA MEĐUNARODNOG SKUPA
ŠTAMPANO U CELINI (M33)
L. Kurešević, I. Delić-Nikolić, O. Vušović
THE POSSIBILITY OF USE OF TALAMBAS VOLCANITES AS A
BUILDING STONE
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD).
In the process of expanding the raw materials base of Republic Serbia, it is
necessary to explore the new localities along with the ones already explored.
Volcanic rocks of Talambas in central Serbia are for the first time covered by
exploration works on the level of regional prospecting. Aiming to determine the
possibility of use of this rock as a building stone for architectural and technical
purposes, we have collected the rock-mass samples and examined them in the
laboratory. Results of these examinations have shown that this stone can be
used as the technical building stone, but not as an architectural stone, despite the
relatively favourable results of physico-mechanical properties testing.
Keywords: building stone, Talambas (central Serbia), trachy-basalt.
O. Vušović, L. Kurešević, I. Delić-Nikolić
CONTRIBUTION TO RECONSTRUCTION OF IMMOVABLE
CULTURAL HERITAGE "SUVAČA" (KIKINDA, SERBIA)
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD).
During the works on restoration of dry mill, the only preserved dry mill
powered by horse-labour in Serbia, we have examined three submitted samples.
Dry mill consists of three connected parts – drive section, milling area and the
miller's apartment. The samples were taken from the rammed-earth wall, the
plaster wall and attic spindle. This paper presents the test results and
conclusions.
Keywords: restoration, dry mill, examinations.
Pregled naučnih i stručnih rezultata u 2014. godini
77
O. Vušović, L. Kurešević, I. Delić-Nikolić
STONE MATERIALS USED FOR BUILDING OF THE AQUEDUCT IN
VIZBEGOVO, SKOPJE, MACEDONIA
26th International symposium on researching and application of contemporary
achievements in civil engineering in the field of materials and structures,
Vrnjаčkа Bаnjа, 2014.
In Vizbegovo near Skopje is situated an aqueduct made of stone and brick, 16.5
m high and 386 m long. The examination of the stone materials in situ has
shown that among the most often used rock types are travertine, sandstone,
schist and marble. Other rock types are less often used. For the purpose of the
reconstruction of the aqueduct, the IMS Institute expert team has taken the
samples of the most often used rock types. These samples have been tested in
the stone and aggregate laboratory of the IMS Institute in Belgrade. The
samples have been used for the petrographic examination and physical
properties testing. Durability of the used rock types has also been examined.
This paper presents the examination results and conclusions based on them.
Keywords: aqueduct, Vizbegovo, stone.
S. Dević, S. Erić, M. Cocić,
ELECTRON MICROSCOPY IN THE FUNCTION OF DETERMINING
THE MINERALOGICAL CHARACTER OF CLAY
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD).
For comprehensive characterization of clay the determining of mineralogical
character of clay is unavoidable. Other clay properties depend on the chemical
and mineralogical composition of clay, and altogether determine clay quality
and its applicability. Electron microscopic analysis is one of the methods of
mineralogical characterization. The results of the electron microscopic testing of
several types of clay are presented in the study. The results showed the presence
of plates and sheets form in clays and layered structure. These forms and
structure are the characteristics of the mineral Kaolinite. The spectrums of the
points of those forms confirm that they belong to the mineral Kaolinite. The
mineralogical character of the tested clays is Kaolinitic.
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Institut za ispitivanje materijala a. d. Beograd
Keywords: clay, electron microscopy, mineralogical, minerals.
S. Dević, S. Erić
ELECTRON MICROSCOPIC ANALYSIS OF THE LOESS AND
METALLIC FRAGMENTS OF BRICK CLAY
International Conference Civil Engineering – Science and Practice, Žabljak,
Montenegro, 17-21 February 2014, (CD) 1821-1828.
This study presents the electron microscopic analysis of the loess and metallic
fragments being present in some brick clays. The loess fragments from three
deposits of brick clays and metallic fragments from one deposit have been
analyzed. The analysis results showed the structure of the loess and metallic
fragments, fragment forms, chemical composition of the selected forms,
similarities and differences of the fragment forms. The loess fragments from
different clay deposits differ according to structure and forms. They partially
differ in the chemical and mineral composition.
Keywords: loess fragments, strukture, forms.
M. Cocić, M. Logar, B. Matović, S. Dević, T. Volkov-Husović, S. Cocić
FINAL FLOTATION WASTE KINETICS OF SINTERING
XXII International Conference Ecological Truth Eco-Ist 14, Bor, 2014, 204208.
In the copper extraction, especially during the process of flotation enrichment
and the pyrometallurgical processing, the waste materials are being generated
that represent huge polluters of environment. Deposits of final flotation waste
(FFW) and discarded slag from the smelting furnaces transform large areas into
degraded soil and they represent permanent source of water and air polltion.To
discuss the application of FFW in the manufacturing new materials from the
glass-ceramic group, were examined thermal properties whose knowledge is
necessary usage in the production of glass-ceramic. The paper presents the
examination of konetocs of sintering FFW by measuring the change of sample
contraction over time in cinsequence heating on thermo microscope.
Pregled naučnih i stručnih rezultata u 2014. godini
79
Keywords: Final flotation waste, kinetics of sintering, glass- ceramic,
application.
S. Dević, M. Cocić, S. Erić
ELECTRONIC MICROANALYSIS AS A SUPPLEMENT TO ZEOLITE
CHARACTERIZATION WITH THE VIEW OF MORE
HETEROGENEOUS AND MORE SUCCESSFUL APPLICABILITY
46th International October Conference on Mining and Metallurgy IOC 2014,
Bor, 2014, 354-357.
The aim of this work was to supplement the mineralogical characterization of
zeolite from localities near Vranje (deposits of zeolite tuffs) by the application
of electronic microanalysis and obtained results. It has been determined by
previously performed mineralogical investigations by using X-ray diffraction
analysis, Optical microscopy and Differential thermal analysis that the mineral
Clinoptilolite forms the base of zeolite tuffs and that its content in them reaches
90%. Zeolites from the same locality have been investigated by electronic
microanalysis and the obtained results served for supplementing the
characterization of zeolite, for more diverse and more successful applicability of
the same.
Keywords: zeolite, electronicmicroanalysis, Clinoptilolite, mineralogical
characterization .
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Institut za ispitivanje materijala a. d. Beograd
RAD U VODEĆEM ČASOPISU
NACIONALNOG ZNAČAJA (M51)
L. Kurešević, S. Dević
GEMSTONE SILICA VEINS IN KREMENJAČA VOLCANIC ROCKS
(SERBIA)
Geologica Macedonica, 2014, Vol. 28, No. 1, 33-38.
The Ješevac volcanic complex located in central Serbia is made up of various
Tertiary volcanic rocks. Kremenjača hill is situated on the SW rim of the
Ješevac volcanic complex. Silica veins found in this site are made up of
chalcedony varieties and crystalline quartz. Jasper veins are examined more
thoroughly in this paper. Microscopic analysis has shown it is made up of
cryptocrystalline silica with fluidal structure. X-ray powder diffraction analysis
of the samples has shown crystalline silica – quartz, ruling out the presence of
amorphous silica – opal. The results of spectrochemical analysis have indicated
the presence of colouring agents originating mostly from ultramafic and mafic
rocks.
Keywords: gemstone, silica veins, jasper, dacite.
Pregled naučnih i stručnih rezultata u 2014. godini
81
SAOPŠTENJE SA SKUPA NACIONALNOG
ZNAČAJA ŠTAMPANO U CELINI (M63)
O. Vušović, I. Delić-Nikolić, L. Kurešević
OCENA STANJA KAMENA NA FASADI ZGRADE GENERALŠTABA
U BEOGRADU
Međunarodna konferencija Savremena dostignuća u građevinarstvu, Subotica,
2014.
Zgrada Generalštaba je građena u periodu od 1956. do 1965. godine. Korišćeni
su varijeteti kamena "Veselje unito" i "Koral", po sastavu organogeni krečnjaci,
mezozojske starosti. Zgrada je ozbiljno oštećena tokom bombardovanja 1999.
godine. U radu je prikazana ocena stanja kamena koji je ugrađen u fasadu ovog
objekta.
Ključne reči: generalštab, krečnjak, ocena stanja.
O. Vušović, I. Delić-Nikolić, L. Kurešević
PRILOG ISTRAŽIVANJU I ISPITIVANJU ISTORIJSKIH MALTERA –
MALTER UGRAĐEN U AKVADUKT U VIZBEGOVU, SKOPLJE,
MAKEDONIJA
26. Mеđunаrоdni simpоziјum о istrаživаnјimа i primеni sаvrеmеnih dоstignućа
u grаđеvinаrstvu u оblаsti mаtеriјаlа i kоnstrukciја, Vrnjаčkа Bаnjа, 2014.
Akvadukt u Skoplju izgrađen je od kamena i opeke, koji su povezani malterom.
Za potrebe sanacije ovog objekta, stručni tim Instituta IMS izvršio je uzimanje
uzoraka maltera sa akvadukta u cilju ispitivanja njihovog sastava, fizičkih i
mehaničkih karakteristika. Ispitivanje je uključilo mikroskopsko,
spektroskopsko (XRF), mineraloško (XRD) ispitivanje, određivanje
zapreminske mase, upijanja vode i pritisne čvstoće. U radu će biti prikazani
rezultati ispitivanja i izvedeni zaključci.
Ključne reči: malter, akvadukt, ispitivanje.
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Pregled naučnih i stručnih rezultata u 2014. godini
DOCTORAL DISSERTATIONS
83
DOKTORSKE DISERTACIJE
84
Institut za ispitivanje materijala a. d. Beograd
L. Kurešević
POTENCIJALNOST TERCIJARNIH MAGMATSKIH KOMPLEKSA
VARDARSKE ZONE SRBIJE SA ASPEKTA ARHITEKTONSKOG
GRAĐEVINSKOG KAMENA
Univerzitet u Beogradu, Rudarsko-geološki fakultet, Beograd, 2014.
U sastavu Vardarske zone, jedne od tektonski najsloženijih oblasti Balkanskog
poluostrva, u čijem domenu se odvijalo otvaranje i zatvaranje okeanskih
prostora i subdukcija koja je dovela do intenzivne magmatske aktivnosti
pretežno tokom tercijara, danas se nalazi veći broj magmatskih kompleksa.
U ovoj disertaciji su obrađene geološke karakteristike trinaest izabranih
magmatskih kompleksa Vardarske zone tercijarne starosti, i laboratorijski
određena mineraloško-petrografska svojstva stena u njihovom sastavu i fizičkomehanička svojstva kamena značajna za utvrđivanje mogućnosti njihove
primene za dobijanje blokova arhitektonskog građevinskog kamena iz kojih se
dobijaju ploče za oblaganje građevinskih objekata. Svi magmatski kompleksi se
nalaze u Eksternoj vardarskoj podzoni.
U grupu magmatskih kompleksa sa ocenom "velika perspektivnost" spadaju
sledeći plutonski magmatski kompleksi: boranjski, bukuljski, kosmajski,
kremićki i željinski. U prelaznu grupu između velike i srednje perspektivnosti
spadaju plutoni Brajkovca i Drenja i subvulkanska masa Slavkovice. U grupu
magmatskih kompleksa sa ocenom "srednja ili ograničena perspektivnost"
spadaju vulkaniti Ravnog brda (Borač) i Gradske Gore (Rudnik). U prelaznu
grupu između srednje i male perspektivnosti spada cerski pluton. U grupu
magmatskih kompleksa sa ocenom "mala perspektivnost ili neperspektivna"
spadaju vulkaniti Talambasa (Borač), Brvenika-Šumnika i Velike Bisine
(Ibarski vulkaniti), Ćeramida (Rudnik) i Kamenice (Stolovi).
Na osnovu svih prikazanih činjenica, može se doneti zaključak da plutonski
magmatski kompleksi Vardarske zone imaju uglavnom veliku perspektivnost sa
aspekta arhitektonskog građevinskog kamena, dok vulkanitski imaju vrlo malu
ili nikakvu. Njihova svojstva koja su nepovoljna sa aspekta arhitektonskog
građevinskog kamena čine ih idealnim za eksploataciju kao tehnički građevinski
kamen.
Ključne reči: Arhitektonski građevinski kamen, magmatske stene, Vardarska
zona, Srbija.
Pregled naučnih i stručnih rezultata u 2014. godini
85
M. Vasić
MODELOVANJE I OPTIMIZACIJA PROCESA SUŠENJA
OPEKARSKIH PROIZVODA
Univerzitet u Beogradu, Tehnološko - Metalurški fakultet, Beograd, 2014.
Izučavanje procesa sušenja, zbog svoje kompleksnosti i danas privlači pažnju
istraživača širom sveta. Objašnjenje procesa sušenja svodi se na: uspostavljanje
niza teorijskih i empirijskih modela koji pokazuju slaganja, u većem ili manjem
stepenu sa eksperimentalnim podacima. Složeni procesi istovremenog prenosa
mase i energije, koji su često nestacionarnarnog karaktera, kao i različita priroda
i osobine materijala (higroskopnost, kapilarnost, distribucija i veličina pora,
pojava skupljanja uz mogućnost nastanaka prslina prilikom sušenja oblikovanih
keramičkih materijala,..) još više komplikuju opisivanje procesa sušenja.
Upravo to su razlozi zbog kojih jedinstveno teorijsko objašnjenje sušenja, koja
bi univerzalno opisalo ovaj proces za različite tipove glinenih materijala još
uvek nije razvijeno.
Modelovanje procesa konvektivnog sušenja, sastoji se u rešavanju skupa
parcijalnih diferencijalnih jednačina sastavljenih od jednačina kinetike procesa i
jednačina bilansa mase i energije. S obzirom da se proces sušenja karakteriše
nizom jednačina, koje izražavaju osnovne zakone fizike sušenja, a koje su
izrazito ne linearne, uz napomenu da se vlažnost materijala menja na unapred
nepoznat način (stohastički) i da ga karakteriše znatno vremensko kašnjenje,
jasno se uočava da je izučavanje procesa sušenja, a pogotovu matematičko
modelovanje kinetike sušenja, izuzetno složeno. Otuda postoji i potreba da se
multidisciplinarnim pristupom i primenom savremenih postavki: fizike, hemije,
nauke o materijalima, fenomena prenosa mase, teorije sušenja i računarskih
tehnologija, prošire postojeća saznanja o procesu sušenja opekarskih proizvoda.
Mehanizmi prenosa vlage za vreme sušenja u periodu konstantne, a naročito
periodu opadajuće brzine sušenja, su vrlo kompleksni i do sada u literaturi nije
postojalo opšte prihvaćeno objašnjenje koje bi moglo da identifikuje tačan
prelaz i redosled delovanja svih potencijalno mogućih mehanizama sušenja.
Predmet istraživanja ove doktorske disertacije usmeren je na definisanje
sveobuhvatnog objašnjenja procesa prenosa vlage tokom izotermskog procesa
sušenja, opekarskih proizvoda uz definisanje tačnog redosleda i rasporeda
međusobne interakcije svih potencijalno mogućih mehanizama sušenja.
U radu je pored literaturnog osvrta na savremna istraživanja procesa sušenja,
dat i prikaz novorazvijenih načina modelovanja procesa sušenja i određivanja
efektivnog koeficijenta difuzije. Ocena modela je izvršena na osnovu poređenja
vrednosti promene sadržaja vlage u materijalu predviđene modelom i promena
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Institut za ispitivanje materijala a. d. Beograd
sadržaja vlage određenih eksperimentalnim putem ili preuzetih u izvornom
obliku iz literature.
Ostvaren doprinos ove doktorske teze,
u definisanju sveobuhvatnijeg
objašnjenja procesa prenosa vlage tokom izotermskog procesa sušenja,
određivanju efektivnog koeficijenta difuzije, kao i modelovanju i optimizaciji
procesa sušenja opekarskih proizvoda, se ogleda u definisanju i izradi:
 tačnog redosleda i rasporeda uzajamnog delovanja svih potencijalno
mogućih mehanizama sušenja.
 matematičkih modela i softera za određivanje efektivnog koeficijenta
difuzije.
 predloga za: sprečavanje pojave nastanka pukotina prilikom sušenja,
skraćenje vremena sušenja i optimizaciju istog.
Ključne reči: mehanizmi sušenja,evektivni koeficijent difuzije, opekarski
proizvodi, sušenje, skupljanje.
Pregled naučnih i stručnih rezultata u 2014. godini
ORGANIZATION
OF CONFERENCES
ORGANIZACIJA
STRUČNIH SKUPOVA
87
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Institut za ispitivanje materijala a. d. Beograd
26. KONGRES I MEĐUNARODNI SIMPOZIJUM O
ISTRAŽIVANJIMA I PRIMENI SAVREMENIH DOSTIGNUĆA U
GRAĐEVINARSTVU U OBLASTI MATERIJALA I KONSTRUKCIJA
Vrnjačka Banja, Hotel Solaris Resort, 29-31.10.2014.
Organizatori
Institut za ispitivanje materijala
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije
Udruženje savremene industrije glinenih proizvoda Srbije
Inženjerska komora Srbije
Simpozijum DIMK Srbije je imao međunarodni karakter što je izuzetno važno
za nauku na polju ispitivanja i istraživanja materijala i konstrukcija. Prisustvo
učesnika na simpozijumu je bilo izuzetno zadovoljavajuće. Posebno je bilo
značajno prisustvo učesnika istraživača i inženjera iz okruženja: Slovenije,
Makedonije, Bosne i Hercegovine.
Po prvi put se u odnosu na prethodni trogodišnji period uočava značajan
napredak u praćenju svetske naučne literature iz odgovarajućih naučnih grana
koja je pretočena u domaća eksperimentalna istraživanja.
Zaključeno je da učešće na međunarodnim i nacionalnih projektima, ako i novi
uslovi za izbore u viša zvanja na Univerzitetima u zemlji i okruženju daju
značajan napredak u procesu istraživanja.
Prisutan je veliki broj mladih istraživača – studenata doktorskih studija čiji su
rezultati rada vidni na osnovu izloženih radova na skupu.
Posebno važan zaključak koji se može izvesti je da Republika Srbija na polju
naučnih oblasti koje su na ovom simpozijumu obrađene ne kasni sa naučnim
dostignućima već ide u korak sa zeljama u svom okruženju što je i najveći
značaj ovog Kongresa.
Pregled naučnih i stručnih rezultata u 2014. godini
89
VII KONGRES SAVREMENE INDUSTRIJE GLINENIH PROIZVODA
SRBIJE SA MEĐUNARODNIM UČEŠĆEM
Vrnjačka Banja, Hotel Solaris Resort, 15-17.10.2014.
Organizatori
Institut za ispitivanje materijala
Udruženje savremene industrije glinenih proizvoda (SIGP), Beograd
Kongresom su obuhvaćene teme vezane za geološka istraživanja sirovinske
baze, eksploataciju, preradu sirovine, tehnološke procese oblikovanja, sušenja i
pečenja i automatizacija procesa. Posebna oblast kojoj je Kongres posvetio
pažnju je primena građevinskom materijla na bazi gline.
U okviru rada Kongresa reallizovano je i predstavljanje stranih i domaćih firmi
– posebno proizvođača opreme za ciglarsku industriju kao i proizvođača grube i
fine keramike.
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Institut za ispitivanje materijala a. d. Beograd
REŠENJE BRZE I EFIKASNE OBNOVE MOSTOVA I PUTEVA
KOJI SU OŠTEĆENI POPLAVAMA I KLIZIŠTIMA
Institut IMS, Beograd, 10.7.2014.
Organizator
Institut za ispitivanje materijala
U Institutu IMS je održan stručni skup, koji je okupio predstavnike Ministarstva
građevinarstva, saobraćaja i infrastrukture, stručnjake Instituta IMS iz oblasti
projektovanja, izgradnje, kontrole i sanacije infrastrukturnih objekata, kao i
predstavnike lokalne samouprave, sa ciljem da se pomogne opštinama koje su
pretrpele štetu na mostovima i lokalnoj putnoj mreži od poplava.
Učesnici su se upoznali sa tehničkim mogućnostima Instituta IMS i partnerskih
kompanija i predlogom modela saradnje sa ugroženim opštinama na otklanjanju
posledica poplava.
Kao društveno odgovorna organizacija, Institut IMS je predložio model
saradnje, uzimajući u obzir finansijske teškoće nakon štete koja je pretrpljena.
Pregled naučnih i stručnih rezultata u 2014. godini
91
KORIŠĆENJE PEPELA IZ TERMOELEKTRANA NA UGALJ
U GRAĐEVINSKE SVRHE
Institut IMS, Beograd, 21.8.2014.
Organizator
ARCAN AG Zurich
Institut za ispitivanje materijala
Grahem d.o.o. Obrenovac
Institut za ispitivanje materijala je organizovao prezentaciju naprednih
tehnologija švajcarske firme ARCAN AG.
Šljaka iz ložišta i prašina nastala pri sagorevanju velikog obima u
termoelektranama predstavlja opasan otpad kojizagađuje životnu sredinu, utiče
na zdravlje ljudi i predstavlja problem za skladištenje. Stručnjaci iz ARCAN-a
su predstavili inovativna rešenja i proizvode u vidu reaktivnih komponenti i
vezivnih sredstava koja omogućavaju da mineralni otpad iz termoelektrana na
ugalj transformišemo u visokokvalitetne građevinske proizvode sa izuzetnim
osobinama.
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Pregled naučnih i stručnih rezultata u 2014. godini
RESEARCH PROJECTS
FINANCED BY THE
MINISTRY OF EDUCATION,
SCIENCE AND
TECHNOLOGICAL
DEVELOPMENT
NAUČNI PROJEKTI
FINANSIRANI OD STRANE
MINISTARSTVA
PROSVETE, NAUKE
I TEHNOLOŠKOG
RAZVOJA
93
94
Institut za ispitivanje materijala a. d. Beograd
NAUČNI PROJEKTI
FINANSIRANI OD STRANE MINISTARSTVA PROSVETE, NAUKE I
TEHNOLOŠKOG RAZVOJA
TEHNOLOŠKI RAZVOJ
Ev.
broj
Naziv projekta
35002
Razvoj novih metodologija
revitalizacje turbinske i
hidromehaničke opreme
hidroelektrana u zavisnosti od
uzroka degradacije materijala
Dr Miodrag Arsić,
rukovodilac projekta
Dr Vencislav Grabulov
Dr Zoran Odanović
Nebojša Milovanović
36014
Geotehnički aspekti istraživanja
i razvoja savremenih tehnologija
građenja i sanacija deponija
komunalnog otpada
Dr Nenad Šušić,
rukovodilac projekta
Mr Ksenija Đoković
Dušan Berisavljević
Jelena Ćirilović
36017
35011
Istraživanje mogućnosti primene
otpadnih i recikliranih materijala
u betonskim kompozitima, sa
ocenom uticaja na životnu
sredinu, u cilju promocije
održivog građevinarstva u Srbiji
Dr Aleksandra Mitrović
Integritet opreme pod pritiskom
pri istovremenom delovanju
zamarajućeg opterećenja i
temperature
Mr Dejan Momčilović
Dr Ksenija Janković
Mr Dragan Bojović
Ljiljana Lončar
Marko Stojanović
Mr Vujadin Aleksić
Pregled naučnih i stručnih rezultata u 2014. godini
35006
Održivost i unapređenje
mašinskih sistema u energetici i
transportu primenom
forenzičkog inženjerstva, eko i
robust dizajna
Dr Miodrag Arsić
35029
Razvoj metodologija za
povećanje radne sposobnosti,
pouzdanosti i energetske
efikasnosti mašinskih sistema u
energetici
Mr Dejan Momčilović
35040
Razvoj savremenih metoda
dijagnostike i ispitivanja
mašinskih struktura
Željko Flajs
INTEGRALNI PROJEKTI
Ev.
broj
Naziv projekta
45008
Razvoj i primena
multifunkcionalnih materijala na
bazi domaćih sirovina
modernizacijom tradicionalnih
tehnologija
Dr Zagorka Radojević
Dr Anja Terzić
Dr Milica Arsenović
Dr Miloš Vasić
Ljiljana Miličić
Ivana Delić
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96
Institut za ispitivanje materijala a. d. Beograd
OSNOVNA ISTRAŽIVANJA
Ev.
broj
Naziv projekta
186010 Minerali Srbije: sastav, struktura, Dr Snežana Dević
geneza, primena i doprinos
održanju životne sredine
172005 Uticaj nano i mikrostrukturnih
konstituenata na sintezu i
karakteristike savremenih
kompozitnih materijala sa
metalnom osnovom
Dr Zoran Odanović
174004 Mikromehanički kriterijumi
oštećenja i loma
Dr Vencislav Grabulov
172057 Usmerena sinteza, struktura i
svojstva multifunkcionalnih
materijala
Dr Anja Terzić
Pregled naučnih i stručnih rezultata u 2014. godini
SELECTED
BUSINESS REFERENCES
ODABRANE
STRUČNE REFERENCE
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Institut za ispitivanje materijala a. d. Beograd
U ovom odeljku dat je pregled ključnih usluga koje je Institut IMS izvršio u
2014. godini.
U skladu sa multidisciplinarnom organizacijom Instituta, usluge obuhvataju
izradu investiciono-tehničke dokumentacije, ispitivanja na terenu i u
laboratorijama, stručni nadzor nad izvođenjem radova, studije, ekspertize i
drugo u praktično svim oblastima građevinarstva i energetike.
Pregled referenci dat je po organizacionim celinama.
Pregled naučnih i stručnih rezultata u 2014. godini
THE CENTRE
FOR MATERIALS
CENTAR
ZA MATERIJALE
99
100
Institut za ispitivanje materijala a. d. Beograd
CENTAR ZA MATERIJALE
Laboratorija za kamen i agregat
R.b. Referenca
1.
Laboratorijska ispitivanja u cilju realizacije geoloških istraživanja
ležišta .
2.
Brojne analize kamena i kamenih agregata.
3.
Ispitivanje maltera sa kulturno-istorijskih spomenika (malter sa
Akvadukta u Skoplju, malter sa spomenika srpskom ratniku u
Polumiru (Kraljevo), malter zidnih slika sa amfiteatra u
Viminacijumu, malter sa Golubačke tvrđave) .
4.
Ispitivanje kamena sa kulturno-istorijskih spomenika (kamen sa
Akvadukta u Skoplju, kamen sa nadgrobnih spomenika u porti Petrove
crkve kod Novog Pazara, kamen sa spomenika Jevrejima palim u
Balkanskom i Prvom svetskom ratu 1912-1914, kamen sa Kamenog
mosta u Ivanjici).
Pregled naučnih i stručnih rezultata u 2014. godini
101
102
Institut za ispitivanje materijala a. d. Beograd
Laboratorija za građevinsku keramiku
R.b. Referenca
1.
Elaborat o oceni kvaliteta opekarske sirovine sa ležišta Mala
Grabovnica ciglane IGM Mladost, Leskovac.
2.
Elaborat o oceni kvaliteta opekarske sirovine sa ležišta Batulovce
ciglane IGM Mladost RAD, Vlasotince.
3.
Elaborat o oceni kvaliteta opekarske sirovine sa ležišta Resinac, polje
C ciglane IGM Mladost TMP, Mala Plana.
4.
Elaborat o oceni kvaliteta opekarske sirovine sa ležišta Kaštavar
ciglane IGM Mladost, Leskovac.
5.
Studija o rezultatima dijagnosticiranja temperaturnog režima rada
tunelske peći sa preporukama za optimizaciju procesa pečenja u
pogonu 1 DILJ d.o.o, Vinkovci, Hrvatska.
6.
Studija o rezultatima dijagnosticiranja temperaturnog režima rada
tunelske peći sa preporukama za optimizaciju procesa pečenja u
pogonu 2 DILJ d.o.o, Vinkovci, Hrvatska.
7.
Studija o rezultatima dijagnosticiranja temperaturnog režima rada
tunelske peći sa preporukama za optimizaciju procesa pečenja u
pogonu Vojvoda Prijezda, Stalać.
8.
Studija o utvrđivanju prirode i uzroka nehomogenosti površine crepa
iz crepane IGM Mladost, Leskovac.
9.
Elaborat o optimalnom formiranju deponije ciglane FIT FS, Bečej.
10.
Optimizacija sirovinskih smeša i ocena mogućnosti proizvodnje
fasadne opeke u ciglani IGM Mladost RAD, Vlasotince.
Pregled naučnih i stručnih rezultata u 2014. godini
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104
Institut za ispitivanje materijala a. d. Beograd
Laboratorija za beton
R.b. Referenca
1.
Kontrola kvaliteta betona na RTB Bor, za EnergoprojektVisokogradnja, Bor.
2.
Elaborat o eksperimantalnom utvrđivanju kvaliteta konstruktivnih
elemenata za zgrade A i B Generalštaba VS u Beogradu.
3.
Projekat betona za objekat: Centralno postrojenje za prečišćavanje
otpadnih voda Vrbas i Kula, za Lad Group, Beograd.
4.
Proizvodna sposobnost fabrike betona za Karin komerc MD,
Novi Sad.
5.
Proizvodna sposobnost fabrike betona za CD HIS, Niš.
6.
Završne ocene kvaliteta betona za objekte izvedene u Srbiji za firmu
Širbegović grupa – GMT Konstrukcije, Gračanica, BiH.
7.
Kontrola kvaliteta betona na projektu: Most Zemun-Borča, za China
Road and Bridge Corporation – Serbia.
8.
Kontrola kvaliteta ugrađenih materijala tokom izvođenja radova na
autoputu E-80, deonica Čiflik-Staničenje, za Construcciones Rubau –
Ogranak Niš.
9.
Pod-konsultant za nadzor građevinskih radova na autoputu E 75
(Grabovnica – Lovosoje), za Louis Berger.
10.
Kontrola kvaliteta betona na gradilištu: Paralelni put Bela - Palanka
Pirot, za Ferbild.
11.
Tekuća kontrola kvaliteta betona na gradilištu: Autoput E-763, deo 3:
Obrenovac-Ub, za China Shandong International Economic &
Technical, Ogranak Beograd.
12.
Kontrola kvaliteta materijala na građevinskom objektu: izgradnja
autoputa E-75, deonica LOT 3-tunel Predejane i LOT 4-tunel Manajle
za Euro Alliance Tunnels JSC- Ogranak Beograd.
13.
Kontrola kvaliteta na deonica autoputa E-75 Grdelica –Caričina
Dolina za firmu AZVI.
Pregled naučnih i stručnih rezultata u 2014. godini
14.
Kontrola kvaliteta na deonica autoputa E-75 Caričina Dolina-tunel
Manajle za firmu Ogranak Prijedorputevi B Beograd.
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Institut za ispitivanje materijala a. d. Beograd
Laboratorija za akustiku i vibracije
R.b. Referenca
Investitor
1.
Grad Beograd,
Gradska uprava,
Sekretarijat za zaštitu
životne sredine
Merenja nivoa komunalne buke na teritoriji
grada Beograda na 35 definisanih mernih
mesta u septembru i oktobru 2014. god.
Rezultati su pokazali da je dominantan izvor
buke u Beogradu saobraćaj.
2.
Merenja nivoa komunalne buke na teritoriji
grada Beograda na 15 ciljanih mernih mesta
izabranih zbog učestalih pritužbu građana na
buku
Građani se najčešće žale na buku sistema za
ventilaciju i klimatizaciju, na buku muzike iz
ugostiteljskih objekata (restorana, kafića,
klubova, splavova), ali i na buku od
obavljanja delatnosti zanatskih pogona i
drugih uslužnih delatnosti.
Grad Beograd,
Gradska uprava,
Sekretarijat za zaštitu
životne sredine
Pregled naučnih i stručnih rezultata u 2014. godini
THE CENTRE
FOR METALS
AND ENERGETICS
CENTAR
ZA METALE
I ENERGETIKU
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Institut za ispitivanje materijala a. d. Beograd
CENTAR ZA METALE I ENERGETIKU
R.b. Referenca
Investitor
1.
Ispitivanje i ocena stanja turbinske i
hidromehaničke opreme agregata A5
PD HE Đerdap d.o.o.
IBR (VT, VTδ, MT, PT UT, RT, HT,
Replika)
Kladovo
HE Đerdap 1,
IR (mehaničko-tehnološke osobine, hemijski
sastav, metalografija)
Prijem opreme i kontrola tehničke
dokumentacije hidroagregata i generatora u
fabrikama u Srbiji i inostranstvu
Izrada tehnologije zavarivanja, izbor
elektrode i ispitivanje metala šava,
ispitivanje za WPS
procena preostalog veka
konsalting usluge
2.
Ispitivanje i ocena stanja turbinske i
hidromehaničke opreme agregata A1 i A2
IBR (VT, VTδ, MT, PT UT, RT, HT,
Replika), procena perostalog veka.
Ispitivanje i ocena stanja dovodnog
cevovoda
PD HE Đerdap d.o.o.
HE Pirot, Pirot
Pregled naučnih i stručnih rezultata u 2014. godini
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110
3.
Institut za ispitivanje materijala a. d. Beograd
Ispitivanje metala metodama sa i bez
razaranja parovoda A1 – A6
PD TE Nikola Tesla
d.o.o.,
Ispitivanje stanja turboagregata A2, A4, A5 i
A6, kapitalni remont turboagregata A1 i A3
TE NT A, Obrenovac
IBR (VT, VTδ, MT, PT, UT, RT, HT,
Replika)
IR (mehaničko tehnološke osobine, hemijski
sastav, metalografija)
Prijem opreme i kontrola tehničke
dokumentacije
4.
Ispitivanje metala metodama sa i bez
razaranja opreme i parovoda
PD TE Nikola Tesla
d.o.o.,
IBR (VT, VTδ, MT, PT, UT, RT, HT,
Replika)
TE Kolubara A, Veliki
Crljeni
IR (mehaničko tehnološke osobine, hemijski
sastav, metalografija)
Prijem opreme i kontrola tehničke
dokumentacije
5.
6.
Kontrolisanje i ispitivanje mašinske opreme
i radova na gradilištu u toku revitalizacije
Bloka 1 i izgradnji postrojenja za
odsumporavanje dimnih gasova blokova 1 i
2 u TE Kostolac B
PD TE KO Kostolac
d.o.o.,
Ispitivanje metala bez razaranja na terenu i
ispitivanje metala sa razaranjem za potrebe
TE Kostolac B
PD TE KO Kostolac
d.o.o.,
Parovodi B1 i B2 (RA, RB, RC), napojna
voda (RL), međupovezni parovodi (MP1MP2 i P2-P3)
IBR (VT, VTδ, MT, PT, UT, RT, HT,
Replika)
IR (mehaničko tehnološke osobine, hemijski
sastav, metalografija)
TE Kostolac B,
Kopovi, Drmno
TE Kostolac B,
Kopovi, Drmno
Pregled naučnih i stručnih rezultata u 2014. godini
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Institut za ispitivanje materijala a. d. Beograd
7.
Kontrolisanje metodama IBR
(VT,MT,PT,UT) i IR (mehaničkotehnološke osobine) pri izradi i sanaciji
delova hidroagregata u fabrici LMZ, Silovie
Mašini, Rusija
PD HE Đerdap d.o.o.,
HE Đerdap 1, Kladovo
8.
Utvrđivanje stanja račvi 6B i 7A trećeg
cevovoda na HE Perućica
EP CG,
HE Perućica,
Nikšić, Crna Gora
IBR (VT, MT, PT, UT, RT), IR (mehaničkotehnološke osobine)
procena preostalog veka
Pregled naučnih i stručnih rezultata u 2014. godini
THE CENTRE
FOR ROADS
AND GEOTECHNICS
CENTAR
ZA PUTEVE
I GEOTEHNIKU
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Institut za ispitivanje materijala a. d. Beograd
CENTAR ZA PUTEVE I GEOTEHNIKU
Laboratorija za geotehniku
R.b. Referenca
Ispitivanje šipova
1.
Izveštaj o ispitivanju integriteta CFA šipova metodom SIT na lokaciji
dr Oetker u Šimanovcima
2.
Izveštaj o rezultatima ispitivanja nosivosti šipova na lokaciji dr Oetker
u Šimanovcima
3.
Izveštaj o ispitivanju nosivosti CFA šipova metodom dinamičkog
probnog opterečenja (DLT) na lokaciji objekta dr Oetker u
Šimanovcima
4.
Izveštaj o ispitivanju integriteta šipova metodom SIT za objekat
"Zaštita iskopa objekta 28A" na lokaciji kliničkog centra u Nišu
5.
Izveštaj o ispitivanju kvaliteta izvedenih šipova metodom SIT za
mostove Morava 1 I Morava 2 na autoputu E-75, deonica Vladičin
han-Predejane (poddeonica Caričina dolina-tunel Manojle)-most
Morava 2, stubno mesto S3L
6.
Izveštaj o ispitivanju kvaliteta izvedenih šipova metodom SIT za
mostove Morava 1 i Morava 2 na autoputu E-75, deonica Vladičin
han-Predejane (poddeonica Caričina dolina-tunel Manojle), stubno
mesto S6L,S2L,S9D,S3L,S5L,S9L,S6L i S3D
7.
Izveštaj o ispitivanju kvaliteta izvedenih šipova metodom SIT za
mostove Morava 1 i Morava 2 na autoputu E-75, deonica Vladičin
han-Predejane (poddeonica Caričina dolina-tunel Manojle), stubno
mesto S4L,S4D,S5D,S3D i S6D
8.
Izveštaj o ispitivanju integriteta šipova metodom SIT za stubno mesto
br.1 mosta na km:80+875, autoput E-80, deonica Čiflik-Pirot
9.
Izveštaj o ispitivanju integriteta šipova metodom SIT za stubno mesto
br.1 mosta na km:80+364, autoput E-80, deonica Čiflik-Pirot
Pregled naučnih i stručnih rezultata u 2014. godini
115
10.
Izveštaj o ispitivanju integriteta šipova metodom SIT za most, autoput
E-80, deonica Čiflik-Pirot (istok)
11.
Izveštaj o ispitivanju integriteta šipova SIT metodom (u svemu prema
ASTM D5882) za objekat u bloku 41 na Novom Beogradu
12.
Izveštaj o ispitivanju nosivosti šipova DLT metodom (u svemu prema
ASTM D4945) za objekat u bloku 41 na Novom Beogradu
13.
Izveštaj o ispitivanju integriteta šipova metodom SIT za objekat 290, u
okviru postrijenja za prečišćavanje otpadnih voda u Šabcu
14.
Izveštaj o ispitivanju integriteta šipova metodom SIT za ugostiteljski
objekat TRICOLLORE, na katastarskoj parceli k.p. 16419, K.O.
Zemun
15.
Izveštaj o ispitivanju integriteta šipova metodom SIT za nadvožnjak
Prnjavor (oznaka 0110) i nadvožnjak Mamutovac (oznaka 0180) na
trasi autoputa Banja Luka-Doboj
16.
Izveštaj o ispitivanju integriteta šipova metodom SIT za most Ukrina
na trasi autoputa Banja Luka - Doboj (oznaka mosta 0220)
17.
Sonic integrity testing of piles on the Banja Luka – Doboj highway for
overpass Prnjavor (code0110) and Mamutovac (code 0180)
18.
Sonic integrity testing of piles on the Banja Luka – Doboj highway for
Ukrina bridge (bridge code 0180)
19.
Izveštaj o ispitivanju kvaliteta izvedenih šipova metodom SIT na
lokalitetu mosta 13 na km:1+843, autoputa E-763,Beograd-Južni
jadran, deonica Ub-Lajkovac od km:40+645,28 do km:53+139,91
20.
Izveštaj o ispitivanju nosivosti izvedenih šipova metodom dinamičkog
ispitivanja DLT na lokalitetu mosta 13 na km:1+843, autoputa E763,Beograd-Južni jadran, deonica Ub-Lajkovac od km:40+645,28 do
km:53+139,91
21.
Izveštaj o ispitivanju kvaliteta izvedenih šipova metodom SIT (u
svemu prema ASTM D5882) za fundiranje širokih kolona za
postrojenje za preradu široke frakcije lakih ugljovodonika na putu
Bački Gračac-Odžaci, Odžaci, temelj C21 i C31
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Institut za ispitivanje materijala a. d. Beograd
Geotehnički elaborati
1.
Izveštaj o debljinama humusa na lokaciji budućeg objekta dr Oetker u
Šimanovcima
2.
Geotechnical report for the bridge no.1
3.
Geotechnical report for the bridge no.3
4.
Geotechnical report for the bridge no.4
5.
Geotechnical report for the bridge no.5
6.
Geotechnical report for the bridge no.8
7.
Elaborat o geotehničkim uslovima fundiranja rezervoarskog prostora
2x500m³ za biodizel na skladištu naftnih derivata u Nišu
8.
Elaborat o geotehničkim uslovima fundiranja rezervoarskog prostora
2x500m³ za biodizel na skladištu naftnih derivata u Smederevu
9.
Geotehnički elaborat za potrebe izgradnje objekta dnevnog/regalnog
skladišta I interne saobraćajnice u skolpu rafinerije NIS a.d. Novi Sad
10.
Izveštaj o izvedenim geotehničkim istraživanjima terena za potrebe
izgrsdnje nove valjare u okviru kompleksa za proizvodnju pneumatika
za motorna vozila u Pirotu
11.
Geotehnički elaborat o rezultatima ispitivanja nosivosti montažnog
platoa Polja D u Zeokama
12.
Izveštaj o geotehničkim istražnim radovima za potrebe fundiranja
radne skele na lokaciji budućeg mosta u Pirotu
13.
Studija ocene stanja konstrukcije oštećene zgrade B Generalštaba VS u
Beograd –sveska B3-Elaborat o geotehničkom ispitivanju tla,
14.
Studija ocene stanja konstrukcije oštećene zgrade A Generalštaba VS
u Beograd-sveska A3-Elaborat o geotehničkom ispitivanju tla,
15.
Studija ocene stanja konstrukcije oštećene zgrade B Generalštaba VS u
Beograd –sveska B2-Elaborat o grodetskom snimanju objekta,
Pregled naučnih i stručnih rezultata u 2014. godini
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Institut za ispitivanje materijala a. d. Beograd
16.
Geološko-geotehnička dokumentacija za potrebe izrade plana
generalne regulacije za naseljeno mesto Lučani-osnovna
dokumentacija
17.
Projekat istraživanja za izradu geološko-geotehničke dokumentacije
plana generalne regulacije za naseljeno mesto Lučani
18.
Geološko-geotehnička dokumentacija za potrebe izrade plana
generalne regulacije za naseljeno mesto Guča-separat
19.
Geološko-geotehnička dokumentacija za potrebe izrade plana
generalne regulacije za naseljeno mesto Guča-osnovna dokumentacija
20.
Geološko-geotehnička dokumentacija za potrebe izrade plana
generalne regulacije za naseljeno mesto Lučani-separat
21.
Projekat istraživanja za izradu geološko-geotehničke dokumentacije
plana generalne regulacije za naseljeno mesto Guča
22.
Izveštaj o obilasku i pregledu terena i objekata na lokacijama masnih
zajednica: Dljin, Guča, Viča, Kaona, Živica
23.
Izveštaj o obilasku i pregledu klizišta na opštinskim putevima: OP 005
Rotajnik-Tijane, OP 004 Guča-Gornja Kravarica-Donja Kravarica, OP
001 Guča-Goračići-Guberevci i OP 006 Carevići-Rasovac-Ploče
24.
Elaborat o geotehničkim uslovima sanacije klizišta Sarića Osoje u
Nemanjinoj ulici-Užice
25.
Izveštaj o merenju nivoa podzemne vode u pijezometrima na lokaciji
Ušće šoping centar na Novom Beogradu
26.
Izveštaj o izvođenju opita standardne penetracije za objekat Most
preko reke Nišave, na km:54+453,391,stub S5L,šip br.17
27.
Zapisnik o izvođenju opita standardne penetracije (SPT opit) u bazi
šipa za most preko reke Stublenice i Jaruge na koridoru 11,deonica:
Obrenovac-Ub,km:39+557.18, na osi S3,broj šipa S3-2 i S3-3
28.
Elaborat o geotehničkim uslovima izgradnje platforme za
avione,zgrade terminala,parking prostora I pristupne saobraćajnice u
sklopu aerodroma Ponikve
Pregled naučnih i stručnih rezultata u 2014. godini
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Institut za ispitivanje materijala a. d. Beograd
29.
Elaborat o geotehničkim uslovima izgradnje stambenog naselja (tri
objekta) spratnosti Pr+5 Krčagovo u Užicu
30.
Elaborat o geotehničkim uslovima izgradnje crkve Krčagovo u Užicu
31.
Elaborat o geotehničkim uslovima izgradnje crkve Međaj u Užicu
Projekti sanacije klizišta
1.
Separat projekta hitne sanacije klizišta-oštećenja trupa puta na
državnom putu IB-30 (R-116), deonica: Ivanjica-Ušće, km:38+100
2.
Projekat potporne konstrukcije na državnom putu IIA-152 (R-126),
deonica: rudnik-Topola, mesto Rudnik na km:25+150
3.
Glavni projekat sanacije klizišta na državnom putu IIa-137 (R-127)
Krupanj-Mačkov kamen-Gračanica, na km: 6+900
4.
Glavni projekat sanacije klizišta na državnom putu IIa-137 (R-127)
Krupanj-Mačkov kamen-Gračanica, na km: 4+400
5.
Glavni projekat sanacije klizišta na državnom putu IIa-137 (R-127)
Krupanj-Mačkov kamen-Gračanica, na km: 2+600
6.
Glavni projekat sanacije klizišta na državnom putu IIa-137 (R-127)
Krupanj-Mačkov kamen-Gračanica, na km: 2+900
7.
Glavni projekat sanacije klizišta na državnom putu IIa-137 (R-127)
Krupanj-Mačkov kamen-Gračanica, na km: 3+600
8.
Glavni projekat sanacije klizišta na državnom putu IIB-364 (R203),
Brajkovac-Belanovica-Rudnik, deonica ID 0129,Varnice, km:50+700
9.
Izmena-usaglašavanje postojećeg Glavnog projekta sanacije klizišta
Vučje 1 na državnom putu IIB-436, Stojkovce-Vučje-Vladičin han,
deonica Vučje-Vlajna, km:42+200-km:42+270, sa novonastalim
stanjem na terenu posle elementarnih nepogoda
10.
Projekat sanacije klizišta na državnom putu IB-27 (M-4) SlovacĆelije-Lazarevac-Aranđelovac-Kruševica-Đurđevo, deonica ID
0138,Kruševica, od km:667+350 do km:667+385
Pregled naučnih i stručnih rezultata u 2014. godini
121
11.
Glavni projekat sanacije klizišta Pejičina krivina na deonici državnog
puta IB-23 Požega-Čačak, deonica ID 0105 (Kratovska stena-skretanje
za Markovicu), između čvornih tačaka 0168 i 0169, od km:595+500
do km:595+600
12.
Glavni projekat sanacije klizišta na državnom putu IIB-364 (R-203)
Brajkovac-Belanovica-Rudnik, deonica ID 0124, Varnice, km:45+600
13.
Glavni projekat sanacije klizišta na državnom putu IIB-364 (R-203)
Brajkovac-Belanovica-Rudnik, deonica ID 0123, Varnice, km:44+700
Tehničke kontrole
1.
Izveštaj o tehničkoj kontroli tehničke dokumentacije Izvođačkog
projekta izmene izvođenja useka na autoputu E-80, Niš (Prosek)Dimitrovgrad (granica Bugarske), deonica 1 (Lot 1): ProsekBancarevo od km:18+125,17 do km:27+550, usek C4S-km: 23+950
do km: 24+575
2.
Izveštaj o tehničkoj kontroli tehničke dokumentacije:
Elaborat o geotehničkim istraživanjima terena za trafostanicu
380/220/110 kv Kraljevo 2 u Kraljevu
Trafostanica 380/220/110 kv Kraljevo 2, seizmička
mikroregionalizacija
122
Institut za ispitivanje materijala a. d. Beograd
Pregled naučnih i stručnih rezultata u 2014. godini
THE CENTRE FOR
STRUCTURES
AND PRESTRESSING
CENTAR ZA
KONSTRUKCIJE
I PREDNAPREZANJE
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Institut za ispitivanje materijala a. d. Beograd
CENTAR ZA KONSTRUKCIJE
I PREDNAPREZANJE
Odeljenje za prednaprezanje
R.b. Referenca
Investitor
Primena sistema prednaprezanja
SPB i SPB SUPER
1.
Mostovi i nadvožnjaci na auto-putu
Banja Luka - Doboj
Vektor Integra d.o.o.
Sarajevo
Primena sistema prednaprezanja
SPB i SPB SUPER i utezački radovi
2.
Most preko potoka Lazanjac na autoputu E763, Beograd – Požega, sektor II: Ljig –
Požega, deonica 3: Takovo – Preljina.
GP Nikolić d.o.o.
Kraljevo
3.
Dva nadvožnjaka i most preko reke Temske
na autoputu E-80, deonica Čiflik –
Staničenje.
Ferbild d.o.o. Beograd
4.
Mostovi na autoputu E-75, deonica Caričina
Dolina – Vladičin Han, lot 5.
Ogranak Integral
Inženjering Beograd
d.o.o. Beograd
5.
Most preko kanala Dunav – Tisa – Dunav sa
montažnim prilaznim konstrukcijama.
West-Gradnja d.o.o.
Šabac
6,
Krovna konstrukcija hale u Vranju prednapregnuti dvopojasni nosači,.
NOVEKO d.o.o.
Vranje
Stručni nadzor
2.
Specijalistički stručni nadzor rada pogona za
adheziono prednaprezanje elemenata u
Inđiji.
MARTINI GRADNJA
d.o.o. Beograd.
Pregled naučnih i stručnih rezultata u 2014. godini
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Institut za ispitivanje materijala a. d. Beograd
Odeljenje za sanacije, projektovanje i nadzor
R.b. Referenca
Investitor
1.
Izrada studije ocene stanja konstrukcije
oštećene zgrade A i B GŠ VS u Beogradu
Ministarstvo odbrane
2.
Glavni projekat rekonstrukcije objekata
centra za selekciju otpada u Subotici
JP Čistoća i zelenilo
Subotica
3.
Glavni projekat sanacije čeličnog mosta
preko reke Ibar u Kraljevu na putu M-5
JP Direkcija za
izgradnju grada
Kraljeva
4.
Glavni projekat konstrukcije objekata
stambeno-poslovnog kompleksa u Osijeku
Gradnja, Osijek
5.
Glavni projekat za dve bitve za privez
pontona
Luka Beograd
Pregled naučnih i stručnih rezultata u 2014. godini
127
128
Institut za ispitivanje materijala a. d. Beograd
Laboratorija za ispitivanje konstrukcija
R.b. Referenca
Investitor
1.
Ispitivanje konstrukcije mostova probnim
opterećenjem na objektu : Stari most preko
Dunava kod Beške, na državnom putu I - A
reda br.1, deonica: Novi Sad – Beograd,
LOT 5.
JP Putevi Srbije
2.
Ispitivanje oslonačkih reakcija na cevovodu
HE „Bistrica“.
JP Drinsko-Limske
hidroelektrane
3.
Ispitivanje probnim opterećenjem
konstrukcije mosta preko reke Ibar u
Kraljevu.
GP Nikolić
i grad Kraljevo
4.
Ispitivanje stenskih ankera probnim
opterećenjem – Koridor X, autoput E-75,
deonica : Niš – granica sa Republikom
Makedonijom, Tuneli „Predejane“ i
„Manajle“.
Euro Alliance Tunnels
JSC
5.
Ispitivanje krovnih nosača probnim
opterećenjem u proizvodnim objektima
„YURA CORPORATION“.
YURA
CORPORATION
6.
Ispitivanje krovnih nosača probnim
opterećenjem u proizvodnim objektima
„SHINWON“.
SHINWON
Pregled naučnih i stručnih rezultata u 2014. godini
CERTIFICATION BODY
SERTIFIKACIONO TELO
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Institut za ispitivanje materijala a. d. Beograd
SERTIFIKACIONO TELO
Institut IMS ad je na osnovu Rešenja Ministarstva građevinarstva, saobraćaja i
infrastrukture broj 35-00-00251/2013-04 od 28.05.2014. godine, imenovan kao
telo za sprovođenje ocenjivanja usaglašenosti cementa opšte namene i cementa
za specijalnu namenu u skladu sa zahtevima Pravilnika o kvalitetu cementa (Sl.
glasnik RS, br. 34/13 i 44/14).
Institut IMS ad je upisan u registar imenovanih tela za ocenjivanje usaglašenosti
pod jedinstvenim registarskim brojem И 030.
Institut IMS je krajem 2013. godine potpisao ugovor sa češkim institutom
TZUS (www.tzus.cz) o saradnji i zajedničkom nastupu na tržištu RS, kojim se
proizvođačima građevinskih proizvoda iz RS omogućava sertifikacija proizvoda
u skladu sa važećom regulativom u EU (Uredbom (EU) br. 305/2011
Evropskog parlamenta i Saveta (CPR) i harmonizovanim tehničkim
specifikacijama) i izvoz na tržište EU.
U cilju pripreme osoblja Instituta IMS za sprovođenje sertifikacije proizvoda
prema harmonizovanim evropskim standardima u toku 2013/2014. godine
održane su sledeće obuke:
Opšti zahtevi Uredbe (EU) br. 305/2011 Evropskog parlamenta i Saveta
(CPR) koja propisuje harmonizovane uslove trgovine građevinskim
proizvodima (Beograd, decembar 2013.);
Postupak sprovođenja sertifikacije fabrike i fabričke kontrole proizvodnje
betona u skladu sa standardom EN 206 (Beograd, jun 2014.);
Postupak sprovođenja sertifikacije fabrike i fabričke kontrole proizvodnje
dodataka betona u skladu sa standardom EN 934-1, EN 934-2, EN 934-6
(Beograd, jun 2014.);
Postupak sprovođenja sertifikacije termoizolacionih materijala (Beograd, jun
2014.);
Postupak sprovođenja sertifikacije eksternih termoizolacionih kompozitnih
sistema (ETICS) (Beograd, jun 2014.).
Nosilac obuke je češki institut TZUS, Prag.
Pregled naučnih i stručnih rezultata u 2014. godini
R.b. Referenca
Sertifikacija proizvoda prema harmonizovanim
evropskim standardima
1.
ROCKWOOL ADRIATIC d.o.o., Potpićan, Hrvatska
2.
URSA SLOVENIJA d.o.o., Novo Mesto, Slovenija
3.
TRIMO INŽENJERING d.o.o., Beograd, Srbija
4.
SIKA d.o.o., Beograd, Srbija
131
Investitor
132
Institut za ispitivanje materijala a. d. Beograd
Pregled naučnih i stručnih rezultata u 2014. godini
CONTROL BODY
KONTROLNO TELO
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Institut za ispitivanje materijala a. d. Beograd
KONTROLNO TELO INSTITUTA IMS
U okrobru 2014. godine je uspešno realizovano ocenjivanje Kontrolnog tela
Instituta IMS od strane Akreditacionog tela Srbije.
Kontrolno telo će dobiti sertifikat o akreditaciji za kontrolisanje:
1. Posuda pod pritiskom;
Opreme pod pritiskom grejane plamenom ili na drugi način;
Cevovoda;
Sigurnosnih i pomoćnih uređaja,
prema Pravilniku o tehničkim zahtevima za projektovanje, izradu i
ocenjivanje usaglašenosti opreme pod pritiskom (Sl. glasnik RS br. 87/11).
2. Gvožđa i čelika (pljosnati proizvodi, limovi, trake, profili, cevi, šipke,
žica, odlivci, otkovci, liveno gvožđe);
3. Metalnih konstrukcija (čeličnih i aluminijumskih);
4. Delova postrojenja i objekata (procesnih, hidroenergetskih,
hidromašinske opreme, hidromehaničke opreme, termoenergetskih,
turboenergetskih) pri izgradnji, rekonstrukciji, revitalizaciji i
remontu).
5. Tehnologija zavarivanja metalnih materijala (elektrolučno
zavarivanje, gasno zavarivanje, navarivanje).
Institut IMS ima dugogodišnje iskustvo u oblastima kontrolisanja za koje se
akreditovao i spreman je za realizaciju novih poslova iz navedenih oblasti.
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