REVIEW PREGLED OF RESEARCH NAUČNIH I STRUČNIH AND BUSINESS RESULTS REZULTATA OF THE IMS INSTITUTE INSTITUTA IMS IN 2015 U 2015. GODINI

Institut za ispitivanje materijala a.d.

Beograd, decembar 2015. PREGLED NAUČNIH I STRUČNIH REZULTATA INSTITUTA IMS U 2015. GODINI REVIEW OF RESEARCH AND BUSINESS RESULTS OF THE IMS INSTITUTE IN 2015

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 978-86-82081-25-8

Karakteristika poslovanja Instituta za ispitivanje materijala za 2015. godinu je povećan obim stručnih poslova koji je doveo do uvećanja prihoda. Pored Centra za materijale i Sertifikacionog tela, koji svake godine beleže napredak, poseban je rezultat je postigao Centar za puteve i geotehniku (sve celine) i deo Centra za metale i energetiku. 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. Nabrojimo kao najznačajnije aktivnosti na koridorima X i XI i značajno učešće u sanaciji brojnih klizišta. Posebno ističemo aktivnosti u realizaciji makroprojekta brze pruge Beograd – Budimpešta. 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, povratili smo svoje mesto u delu ispitivanja metalnih materijala razaranjem. Što se naučno istraživačkog rada tiče, postignuti su rezultati na koje je Institut IMS već navikao. Značajno je učešće naših saradnika ne realizaciji sedam projekata tehnološkog razvoja, jedog projekta integralnih i interdisciplinarnih istraživanja i četiri projekta iz programa osnovnih istraživanja. Tokom 2015. godine, Naučno veće Instituta je usvojilo Program naučnoistraživačkog rada i Program razvoja naučnoistraživačkog podmlatka za period 2015-2019. godine. Osnova za donošenje ovih dokumenata je bilo strateško opredeljenje rukovodstva Instituta ka daljem razvoju naučno- istraživačke i inovacione delatnosti, kao i primeni rezultata istraživanja uz poštovanje principa multidisciplinarnosti koja odlikuje Institut IMS, kao i usmerena kadrovska politika. Ovu godinu posebno korakterišu napori istraživača da se proširi međunarodna saradnja kroz učešće na projektima Horizon 2020, COST i IPA. Naučni kadar je značajno poboljšan, pre svega kroz opredeljenje mladih istraživača za dalje naučno usavršavanje koje se reflektovalo na povećan broj istraživača sa istraživačkim zvanjima. Rezultati istraživačkog rada su u skladu sa dosadašnjim trendom rasta broja publikacija u međunarodnim časopisima i učešća istraživača na vodećim međunarodnim skupovima.

Urednici Pregled naučnih i stručnih rezultata u 2015. godini 1

SADRŽAJ

REZULTATI NAUČNO-ISTRAŽIVAČKOG RADA ...... 5

T 150 TEHNOLOGIJA MATERIJALA ...... 7 Saopštenje sa međunarodnog skupa štampano u celini (M33) ...... 8 Saopštenje sa međunarodnog skupa štampano u izvodu (M34) ...... 10

T 152 KOMPOZITNI MATERIJALI ...... 11 Saopštenje sa međunarodnog skupa štampano u celini (M33) ...... 12 Saopštenje sa međunarodnog skupa štampano u izvodu (M34) ...... 13 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ...... 17 Bitno poboljšan proizvod ili tehnologija (M84) ...... 18

T 153 KERAMIČKI I PRAŠKASTI MATERIJALI ...... 19 Rad u vrhunskom međunarodnom časopisu (M21) ...... 20 Saopštenje sa međunarodnog skupa štampano u celini (M33) ...... 24 Saopštenje sa međunarodnog skupa štampano u izvodu (M34) ...... 27 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ...... 31

T 210 MAŠINSTVO, HIDRAULIKA, VAKUUMSKA TEHNOLOGIJA, VIBRACIJE I AKUSTIČKI INŽENJERING ...... 33 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ...... 34 2 Institut za ispitivanje materijala a.d. Beograd

T 220 GRAĐEVINARSTVO, HIDRAULIKA, PRIOBALNA TEHNOLOGIJA, MEHANIKA TLA ...... 39 Rad u tematskom zborniku vodećeg međunarodnog značaja (M13)...... 40 Rad u međunarodnom časopisu (M23)...... 41 Saopštenje sa međunarodnog skupa štampano u celini (M33) ...... 44 Rad u časopisu nacionalnog značaja (M52) ...... 47 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ...... 48 Bitno poboljšan proizvod ili tehnologija (M84) ...... 50

T 230 VISOKA GRADNJA ...... 51 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ...... 52

T450 TEHNOLOGIJA METALA, METALURGIJA, PROIZVODI OD METALA ...... 53 Rad u vrhunskom međunarodnom časopisu (M21) ...... 54 Rad u međunarodnom časopisu (M23)...... 57 Predavanje po pozivu sa međunarodnog skupa štampano u celini (M31)...... 60 Saopštenje sa međunarodnog skupa štampano u celini (M33) ...... 61 Rad u vodećem časopisu nacionalnog značaja (M51) ...... 68

B 003 EKOLOGIJA ...... 71 Saopštenje sa međunarodnog skupa štampano u izvodu (M34) ...... 72

T 150 PETROLOGIJA, MINERALOGIJA, GEOHEMIJA ...... 73 Saopštenje sa međunarodnog skupa štampano u celini (M33) ...... 74 Rad u vodećem časopisu nacionalnog značaja (M51) ...... 78 Saopštenje sa skupa nacionalnog značaja štampano u celini (M63) ...... 79 Pregled naučnih i stručnih rezultata u 2015. godini 3

DOKTORSKE DISERTACIJE ...... 83 ORGANIZACIJA STRUČNIH SKUPOVA ...... 85 NAUČNI PROJEKTI FINANSIRANI OD STRANE MINISTARSTVA PROSVETE, NAUKE I TEHNOLOŠKOG RAZVOJA ...... 89 NAGRADE I PRIZNANJA ...... 93

ODABRANE STRUČNE REFERENCE ...... 97 CENTAR ZA MATERIJALE ...... 99 CENTAR ZA METALE I ENERGETIKU ...... 109 CENTAR ZA PUTEVE I GEOTEHNIKU ...... 113 CENTAR ZA KONSTRUKCIJE I PREDNAPREZANJE ...... 117 SERTIFIKACIONO TELO ...... 123 KONTROLNO TELO ...... 125 PT PROVAJDER ...... 127

4 Institut za ispitivanje materijala a.d. Beograd

Pregled naučnih i stručnih rezultata u 2015. godini 5

RESULTS REZULTATI OF SCIENTIFIC RESEARCH NAUČNO-ISTRAŽIVAČKOG WORK RADA 6 Institut za ispitivanje materijala a.d. Beograd

Pregled naučnih i stručnih rezultata u 2015. godini 7

T 150 T 150 MATERIAL TEHNOLOGIJA TECHNOLOGY MATERIJALA 8 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M33)

K. Janković, D. Bojović, M. Stojanović, Lj. Lončar

THE USE OF MINE TAILINGS AS A PARTIAL AGGREGATE REPLACEMENT IN SCC CONCRETE International Conference Contemporary Achievement in Civil Engineering, Subotica, 2015, 67-72. In previous work, we found the tailings has no pozzolanic activity and that its application in mortar and concrete can be made in the form of replacement of participation in a certain percentage of aggregates. In this paper we discuss the possibility of applying tailings in self-compacting concrete (SCC). Testing of some properties of fresh and hardened SCC concrete in which 10 and 20% fractions of 0/4 mm aggregate was replaced with tailings was performed. The test results of compressive strength were compared with the standard. Key words: talings, self-compacting concrete, aggregate.

K. Janković, D. Bojović, M. Stojanović, Lj. Lončar, L. Antić

THE INFLUENCE OF TAILINGS AS A PARTIAL SUBSTITUENTE IN AGGREGATE WITH SUPLHATE-RESISTANT CEMENT TO SCC CONCRETE DURABILITY XVI International Symposium MASE, Ohrid, Macedonia, 2015, 319-324. Tailings test results showed no pozzolanic activity and that its application in concrete can be a partial replacement of aggregate. This paper presents the possibility of using tailings in self-compacting concrete made with sulphate resistant cement. Concrete specimens in which the aggregate fraction 0/4 mm was replaced with 10 and 20% of tailings were examined. The resistance on freezing and thawing with de-icing salts is used as an indicator of concrete durability. Key words: talings, self-compacting concrete, aggregate.

Pregled naučnih i stručnih rezultata u 2015. godini 9

K. Janković, M. Stojanović, D. Bojović, Lj. Lončar, L. Antić

THE POSSIBILITY OF THE USE OF CEM IV IN AGGRESSIVE ENVIRONMENTS XVI International Symposium MASE, Ohrid, Macedonia, 2015, 325-331. Durability and exploitation life of a structure depends on the aggressiveness of the environment in which it is located. The possibility of using CEM IV in aggressive environments was investigated in this study. Two concrete mixtures were made with pozzolanic cement with quantities of 310 and 360 kg/m3. The results of testing the influence of aggressive solutions on concrete and its freeze/thaw resistance were presented. Key words: pozzolanic cement, chemical resistance, freeze/thaw resistance.

10 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U IZVODU (M34)

K. Janković, S. Stanković, D. Bojović, M. Stojanović, Lj. Miličić

THE INFLUENCE OF NANO-SILICA AND BARITE AGGREGATE ON PROPERTIES OF ULTRA HIGH PERFORMANCE CONCRETE Seventeenth Annual Conference YUCOMAT, Herceg Novi, Montenegro, 2015, 74. Development of building materials with improving characteristics and its application on increasing structure durability and sustainability is one of goals in civil engineering. Application of nano-silica in concrete is one of the possibilities to improve concrete properties. Concrete with nano-silica has denser and compact microstructure. Nano-silica has higher pozzolanic reactivity than silica fume and can reduce cement content in ultra high performance concrete (UHPC). Nano- silica in cementitious materials influences on cement hydration and modify pore structure. The main objective of this paper is to evaluate the influence of different content of nano-silica and barite aggregate on properties of UHPC. Two types of aggregate were used: quartz and barite. As a heavy-weight aggregate barite is used to increase concrete density. By combining the properties of concrete with nano-silica and concrete with heavy-weight aggregate, ultra high performance concrete can be produced which have advantages of both types of concrete, i.e. higher durability and radiation protection. Key words: nano-silica, UHPC, barite, radiation protection.

Pregled naučnih i stručnih rezultata u 2015. godini 11

T 152 T 152 COMPOSITE KOMPOZITNI MATERIALS MATERIJALI 12 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M33)

A.Mitrović, M. Zdujić

EVALUATION OF SELECTED SERBIAN KAOLIN CLAYS AS A RAW MATERIAL FOR THE CEMENT AND CONCRETE INDYSTRY XVI Balkan Mineral Processing Congress, Belgrade, 2015, Vol. I, 579-583. This study presents the results related to the evaluation of selected kaolin clay deposits in Serbia for production of metakaolin (MK). Three deposits, Vrbica and Garaši from Aranđelovac basin, and Miličnica from Kolubara basin were investigated, since it is well known that the development of pozzolanic properties in calcined clays mainly depends on the nature and abundance of clay minerals in the raw material. They were selected as they differ in kaolinite content, presence of impurities, and crystallinity of the original kaolinite. Vrbica, high quality kaolin clay, contains 80% of a medium ordered kaolinite and loss of ignitation of 12.33%. Garaši and Miličnica, medium-quality kaolin clay, have nearly the same mineralogical composition, 52–53% kaolinite and about 40% quartz. The main difference between these clays is the degree of crystallinity. Kaolinite of Garaši is a poorly ordered one, while kaolinite of Miličnica is a medium ordered. Reactivity of the calcined clays also depends on the calcination conditions and on the fineness of the final product. The optimal calcination parameters, temperature and heating time are: 650 °C and 90 min for Vrbica, 600 oC and 120 min for Garaši, and 650 oC and 120 min for Miličnica, for which pozzolanic activities expressed in g Ca(OH)2/g MK are 0.65, 0.60, and 0.45, respectively. According to pozzolanic activity, Vrbica and Garaši clays are valuable raw material for obtaining pozzolanic additive in a form of metakaolin. Keywords: kaolin clay, calcination, pozzolan.

Pregled naučnih i stručnih rezultata u 2015. godini 13 SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U IZVODU (M34)

A. Terzić, V. Mitić, Lj. Kocić

FRACTAL ANALYSIS OF HETEROGENEOUS CERAMIC COMPOSITE MATERIALS Materials Science & Technology 2015 (MS&T15), Columbus, OH, USA, 2015, G-4. Fractal dimensions theory employed in the surface topography analysis as a means of explanation of composite materials mechanical and microstructural characteristics has been studied. Fractal dimensions method is introduced by employing a fractal concept of curvature radii of surfaces, depending on the observation scale and horizontal lines intercepted by the investigated profile. The structure of a ceramic composite material appears as a chaotically distributed multiplicity of grains and pores. However, the recent investigations enabled previewing structure of such materials via fractal dimension calculation in three dimensions. The fractal dimension evaluated by grains’ profilographs obtained by SEM micrographs are slightly above 1, which corresponds to the line dimension. The fractal dimension of ceramic composite surface fragment extracted from the SEM microphotograph is slightly higher than 2, while the same photographs after the surface reconstruction procedure reveals surface dimension that is typically between 2.5 and 2.8 which is pretty rough. Since ceramic composite materials exhibit variety of mechanical and thermo- mechanical properties like compressive and flexural strength, refractoriness, refractoriness under load etc., it is important to investigate influence of fractal structure on these properties. One of the main goals is to explore distribution of micro-sized properties through a ceramic bulk. The new approach of 3D fractal networks is applied and investigated on bauxite based refractory composite. Keywords: ceramics, defects, roughness, inclusions, curvature radius, fractals. 14 Institut za ispitivanje materijala a.d. Beograd

A. Terzić, Z. Radojević, M.Arsenović, V. Mitić, S. Pašalić

APPLICATION OF THE FRACTAL METHOD IN THE CERAMIC COMPOSITES SURFACE FLAWS CHARACTERIZATION 9th Int'l Conf & Expo on Advanced Ceramics & Composites (ICACC 2015), Daytona, USA, 2015, 55. Fractal dimensions theory employed in surface analysis as a means of structural defects origin explanation was studied. This paper proposes new method of roughness peaks curvature radii calculation and its application to glazed ceramic composites surface tribological analysis. Fractal dimensions method is introduced via asperity radius calculation by fractal concept of surfaces curvature radii. Dependence of calculated radii on fractal dimension of studied curves was established and notion of peak is mathematically formulated. The method efficiency was tested by fractal curves simulations described by Brownian motions. Microstructural investigations were conducted using SEM equipped with EDS. Correlation between defects microstructure and ceramic composite properties, based on fractal geometry and contact surface probability, has been developed. Using fractals and grains contact surface statistics a reconstruction of microstructure configurations has been successfully performed. Obtained results indicated that fractal analysis and statistics model for contact surfaces of different shapes were important for prognosis of ceramics properties and identifying defects origin. The novel statistical approach to investigation of ceramic defects was successfully conducted, as a result introducing fractal identification as means of evaluating performance of ceramic composites. Keywords: traditional ceramics, defects, roughness, inclusions, curvature radius, fractals.

B. Ilić, A. Mitrović, M. Zdujić

THE EFFECT OF „AMORPHOUS KAOLIN“ ON PROPERTIES OF CEMENT-BASED COMPOSITES 3rd Conference of The Serbian Society for Ceramic Materials, Belgrade, 2015, 118. Although pozzolanic materials are used successfully in many countries, nowadays the goal of many studies is to manufacture new pozzolans for making Pregled naučnih i stručnih rezultata u 2015. godini 15 high strength composites. In that sense, influence of different cement replacement level with the amorphous kaolin, obtained by mechanochemical treatment, in the cement-based composites was investigated. The cement-based composites, made with amorphous kaolin and addition of hydrated lime, water glass, standardized quartz sand and superplasticizer, were exposed to autoclaving curing. The obtained result of the compressive strength 91.2MPa, in composite with cement replacement level of 50% of amorphous kaolin, is slightly higher than those obtained on control sample. It was concluded that amorphous kaolin can be classified as advanced material, which use in cement-based composites have numerous technical and ecological advantages.

Lj. Miličić, A. Terzić, Z. Radojević

THE INVESTIGATION OF HEAVY METALS LEACHING FROM COAL ASH Serbian Ceramic Society Conference Advanced Ceramic and Application IV – New frontiers in multifunctional material science and processing, Belgrade, 2015, 76. The production and the disposal of the coal ash that is generated and processed in the power-plants represent a remarkable hazard in terms of the environmental pollution. Both fly ash that is produced in electrostatic filters of the power plant and the coal ash that is landfilled can be submitted to recycling and reusing procedure in order to diminish the consequences which their disposal might have on air, soil and underground water. The coal ash normally contains certain quantity of heavy metals in the chemical composition. The heavy metals can be regarded as toxic pollutants due to the high risk of their leaching when the ash is in contact with water. Also, there is a certain risk of toxic elements leaching even when coal ash is built-in the construction composites. However, the recycling and reapplication of fly ash in building materials industry is only sustainable economic solution for the ash disposal problem. Fly ash can be used as a component in cement, mortar, concrete and bricks. Utilization potential of the fly ash and landfilled ash, as the main residue from the lignite coal combustion in Serbian power plants, was investigated in this study. Ash from filters from five different power plants and four landfills were applied in several composite samples (mortar, concrete and brick) without any physical or thermal pre- treatment. The leachability of thepotentially toxic pollutants from the ash and ash 16 Institut za ispitivanje materijala a.d. Beograd based products was investigated. The leaching behavior and potential environmental impact of the following potentially hazardous elements was tracked: Pb, Cd, Zn, Cu, Ni, Cr, Hg, As, Ba, Sb and Se. A detailed study of physico-chemical characteristics of the ash, with accent on trace elements and the chemical composition investigation is included. The results show that most of the elements are more easily leachable from the ash in comparison with the ash based composites. The leaching of investigated pollutants is within allowed range thus investigated coal ashes can be reused in construction materials production. Kywords: composite materials; fly ash; leaching; mechanical characteristics; recycling.

Pregled naučnih i stručnih rezultata u 2015. godini 17 SAOPŠTENJE SA SKUPA NACIONALNOG ZNAČAJA ŠTAMPANO U CELINI (M63)

D. Jevtić, A. Mitrović, J. Markićević, A. Savić

SVOJSTVA CEMENTNIH MALTERA SA DODATKOM AMORFNOG KAOLINA International Conference Contemporary Achievements in Civil Engineering 2015, Subotica, 2015. U radu su dati rezultati eksperimentalnih istraživanja fizičko-mehaničkih svojstava maltera sa dodatkom amorfnog kaolina, koji je dobijen preradom kaolinskih glina Aranđelovačkih basena. Posebna pažnja bila je posvećena dominantnim mehaničkim parametrima maltera, čvrstoći pri pritisku, čvrstoći pri savijanju i adheziji maltera za podlogu. Ključne reči: amorfni kaolin, malter, kaolinska glina, fizičko-mehanička svojstva.

18 Institut za ispitivanje materijala a.d. Beograd BITNO POBOLJŠAN PROIZVOD ILI TEHNOLOGIJA (M84)

A. Terzić, Z. Radojević, Lj. Miličić

PROIZVODNJA VATROSTALNOG TORKRET BETONA SA DODATKOM LETEĆEG PEPELA KAO OTPADNOG MATERIJALA ZA PRIMENU U INDUSTRIJSKIM TERMIČKIM AGREGATIMA Tehničko rešenje je rezultat Projekta III 45008, Institut IMS a.d., Beograd; Korisnik/naručilac: Fabrika „Šamot“ d.o.o., Aranđelovac; Godina izrade 2014, godina prihvatanja TR od strane MNOTR 2015.

Pregled naučnih i stručnih rezultata u 2015. godini 19

T 153 T 153 CERAMIC MATERIALS KERAMIČKI AND POWDERS I PRAŠKASTI MATERIJALI 20 Institut za ispitivanje materijala a.d. Beograd RAD U VRHUNSKOM MEĐUNARODNOM ČASOPISU (M21)

A. Terzić, L. Pezo, Lj. Andrić, M. Arsenović

EFFECTS OF MECHANICAL ACTIVATION ON THE PARAMETERS OF TALC QUALITY FOR CERAMICS PRODUCTION - CHEMOMETRIC APPROACH Composites: Part B: Engineering, 2015, Vol. 79, 660-666. Talc is broadly used in the ceramic materials industry, either as a basic raw material, or as filler, due to its chemical inertia, fragmentation proneness, thermal stability, and refractoriness. The mechanical activation is frequently employed in the direct enhancement of talc properties, and thereby in the design of talc based composites with advanced performances. The differences in the set of the process parameters measured before and after talc activation via ultra-centrifugal mill Retsch ZM-1, and their influence on the grain-size distribution related characteristics have been investigated. The mechanical treatments are energetically unsustainable procedures, therefore the talc activation was optimized on basis of assessment of the process variables (number of rotor revolutions, current intensity, activation period, circumferential rotor speed and mill capacity) effect on the final quality of product parameters (mesh sizes, cumulative oversizes, average grain size, level of micronization kinetics, mesh size appropriate to 95% micronized product cumulative undersize and specific surface area). The activated product parameters in all experimental sequences were obtained by the analytical procedure based on Rosin-Rammler-Sperling equation. Response surface method, standard score analysis and principal component analysis were used as a means of the optimization. Developed models showed r2 values in the range of 0.714-0.908 and they were able to accurately predict quality parameters in a wide range of process parameters. Standard score analysis highlighted that the optimal sample was obtained using sieve mesh of 120 μm set of processing parameters (SS=1.0). Multiple comparison tests revealed that the optimal variation in the processing parameters could reduce the negative effect of talc samples inherent properties on the final score and improve the activation procedure energetic and economic sustainability. Pregled naučnih i stručnih rezultata u 2015. godini 21

Keywords: fragmentation; analytical modeling; powder processing; optimization; response surface analysis; principal component analysis.

M. Arsenović, L. Pezo, S. Stanković, Z. Radojević,

FACTOR SPACE DIFFERENTIATION OF BRICK CLAYS ACCORDING TO MINERAL CONTENT: PREDICTION OF FINAL BRICK PRODUCT QUALITY Applied Clay Science, 2015, Vol. 115, 108-114. Chemical composition and XRD qualitative analysis were used to calculate mineral contents of 139 brick clay raw materials using LPNORM. The second order polynomial models (SOP) for all the samples, which express the relation between mineral contents and the characteristics of fired laboratory products, did not fit to experimental data satisfactorily, due to low coefficients of determination (r2). In order to improve the models, the samples are divided into four groups in factor space (four quadrants), according to their mineral content similarity, using principal component analysis (PCA). Predictive models of compressive strength (CS), water absorption (WA), firing shrinkage (FS), weight loss during firing (WLF) and volume mass of cubes (VMC) are obtained for each of the groups. Second order polynomial (SOP) models are developed, and the influence of certain minerals to brick clay bricks quality within the groups is discussed. Developed models were able to predict the final quality of products in a wide range of mineral content and temperature treatment data, showing coefficient of determination (r2) in range between 0.704–0.995. In order to estimate the adequacy of these models, the results were applied to the experimental data and compared according to additional statistical tests, so the next values are determined: coefficients of determination, reduced chi-square (χ2), mean bias error (MBE), mean percent error (MPE) and root mean square error (RMSE). Keywords: brick clay, minerals content, prediction of quality, Principal Component Analyses, mathematical modeling. 22 Institut za ispitivanje materijala a.d. Beograd

M. Arsenović, Z. Radojević, Ž. Jakšić, L. Pezo

MATHEMATICAL APPROACH TO APPLICATION OF INDUSTRIAL WASTES IN CLAY BRICK PRODUCTION - PART I: TESTING AND ANALYSIS Ceramics International, 2015, Vol. 41, No. 3, 4890-4898. The objective of this study was to investigate utilization potential of organic and inorganic industrial wastes in clay bricks. Mineral composition of starting heavy clay sample is tested using an X-ray diffractometer. Chemical content and loss on ignition were determined in sludges, coal dust, fly and landfill ashes, soybean crust, sawdust, sunflower hulls and their ash. Different ratios of wastes were added to heavy clay, while the applied firing temperatures were in the range 850– 1000 °C. The laboratory samples (tiles, solid bricks and hollow blocks) were s quality were׳tested by using the standard test methods. Changes in product studied in terms of relative differences to ceramic-technological parameters compared to samples without waste materials addition. It is noticed that all of the additives increased weight loss, firing shrinkage and water absorption, while decreasing compressive strength and volume mass. The greatest changes in performances were observed with addition of organic materials, whereas, among them, sunflower hulls initiated the lowest compressive strength. Inorganic additives introduced fewer changes to fired products, while fly ash caused the lowest decrease in compressive strength. Response Surface Methodology (RSM) was applied and Second Order Polynomial models (SOP) were used to show the effects of firing temperature, waste materials addition and their quantity on characteristics of fired products. High prediction accuracy was obtained, with coefficient of determination in the range of 0.896–0.999. It was concluded that all of the analyzed materials can generally be used in building bricks by taking advantage of low cost and environmental protection, whereby thermal conductivity decreases. Keywords: industrial wastes, heavy clay bricks, Response Surface Method, Second Order Polynomial models. Pregled naučnih i stručnih rezultata u 2015. godini 23

M. Arsenović, Z. Radojević, Ž. Jakšić, L. Pezo

MATHEMATICAL APPROACH TO APPLICATION OF INDUSTRIAL WASTES IN CLAY BRICK PRODUCTION-PART II: OPTIMIZATION Ceramics International, 2015, Vol. 41, No. 3, 4899-4905. The effects of organic and inorganic waste sludges, coal dust, fly and landfill ashes, soybean crust, sawdust, sunflower flakes and their ash addition to representative heavy clay were investigated. Changes introduced to shaping moist (SM), shrinkage (ΔSk) and weight loss (ΔGk) in Bigot’s curve critical point, and plasticity coefficient (PC) by Pfefferkorn were studied. The highest sensitivity to drying showed samples with coal dust addition, while the greatest plasticity and shaping moist was detected in samples with 50 wt% of fly and landfill ashes. The influence of waste material used, its’ content and also firing temperature were independent parameters that influenced compressive strength, water absorption, firing shrinkage, weight loss during firing and volume mass as dependent parameters. Second order polynomial mathematical models predicted fired products characteristics, and were later used to determine the optimum conditions by Response Surface Method (RSM), coupled with Fuzzy Synthetic Evaluation algorithm (FSE), using trapezoidal function. The choice of the parameters optimal interval that characterized fired products (water absorption, compressive strength, weight loss during firing, firing shrinkage and volume mass), depended on a final usage of the raw material in heavy clay brick industry. The optimization results showed that sunflower hulls, wood sawdust, soybean husks and saturation sludge are best to be used in solid bricks production. Coal dust, landfill ashes and neutralization (inorganic) sludges are best to be used in hollow bricks production. Sunflower hulls ash can be added in higher quantity to heavy clay to produce blocks or in lower quantity in roof tiles. Fly ashes addition of 50 wt% allows roof tiles production. The optimal temperature for solid bricks and hollow blocks production is found to be 900–950 °C. Keywords: industrial wastes, heavy clay industry, properties prediction, process optimization. 24 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M33)

A. Terzić, L. Pezo, Lj. Andrić, M. Trumić, G.Bogadanović

EFFECTS OF MECHANICAL ACTIVATION ON THE PARAMETERS OF MICA QUALITY FOR APPLICATION IN INSULATION MATERIALS - CHEMOMETRIC APPROACH XVI Balkan Mineral Processing Congress, Belgrade, 2015, 1131-1137. Mica is widely utilized in the production of insulation materials as filler due to its chemical inertia, fragmentation proneness and dielectric properties. Mechanical activation is frequently applied procedure for achieving direct enhancement in a variety of mica properties and indirect improving of the mica based composites characteristics. In this paper, the influence of the process parameters on the grain-size distribution related characteristics of mica was investigated for the mechanical activation performed using ultra-centrifugal mill Retsch ZM-1. The initial and activated mica samples were thoroughly analyzed and the activation induced changes in the properties were recorded. The activation is energetically and economically unlikely sustainable procedure therefore it is necessary that the process is optimized. Optimization of the mica activation was based on the assessment of the effects of processing parameters (number of rotor revolutions, current intensity, activation period, circumferential rotor speed and mill capacity) on the product quality parameters (mesh sizes, cumulative oversizes, average grain size, level of micronization kinetics, mesh size appropriate to 95% micronized product cumulative undersize and specific surface area). The activation product parameters in all experimental sequences were obtained by analytical procedure based on Rosin-Rammler-Sperling equation. Response surface method, Standard score analysis and Principal component analysis were used for assessing the effect of process variables on the final quality of product parameters. Developed models showed r2 values in the range of 0.677-0.962 and they were able to accurately predict quality parameters in a wide range of processing parameters. Standard score analysis highlighted that the optimal sample was obtained using sieve mesh of 80μm set of processing parameters (SS=0.81). Multiple comparison tests revealed that the optimal variation in the processing parameters could reduce the negative effect of mica Pregled naučnih i stručnih rezultata u 2015. godini 25 samples inherent properties on the final score and improve activation procedure energetic and economic sustainability. Keywords: milling; grain size; optimization; response surface analysis; principal component analysis.

A. Terzić, L. Pezo, Z. Radojević, Lj. Andrić

OPTIMIZATION OF AL2O3 SYNTHESIS PROCEDURE USED IN PRODUCTION OF COMPOSITE CERAMIC MATERIALS 47th International October Conference on Mining and Metallurgy, Bor, 2015, 191-196. Activation process variables influence on final quality of the product parameters assessment was conveyed in order to optimize of Al2O3 thermo-mechanical synthesis. Response surface method, Standard score analysis and Principal component analysis were used for optimization. Established mathematical models precisely predicted quality parameters in a broad range of processing parameters. Standard Score Analysis showed that the optimal output was obtained with sieve mesh of 120μm set of processing parameters. Diverse comparison analyses disclosed that optimal set of activation process parameters could reduce negative effect of γ-Al2O3 immanent properties on final score, and enhance rate of γ to α transition which would improve energetic and economic sustainability of activation applied in processing of alumina used in production of high-temperature ceramics.

Keywords: Al2O3; milling; thermal applications; statistical analysis, analytical modeling.

Lj. Andrić, A. Terzić, S. Pašalić, M. Petrov, D. Radulović

ACTIVATION OF PHOSPHATES FOR APPLICATION IN COMPOSITE CERAMIC MATERIALS 47th International October Conference on Mining and Metallurgy, Bor, 2015, 77- 82. The aim of the investigation was to increase the reactivity of the comminuted phosphate ore for application in composite ceramic materials. The vibratory and 26 Institut za ispitivanje materijala a.d. Beograd planetary mills were used as mechanical activators during experimental research. The obtained results highlighted presence of both amorphous and crystallized forms appearing in the observed phosphate ore mixture due to the specific genetic conditions which rarely occur in deposits. The heterogenic composition of the ore useful phosphoric part gave optimal results during the leaching test. For the first time, the experiments of phosphate mechano-chemical activation from Lisina ore deposit were performed in order to improve its reactivity. Keywords: planetary mill, vibratory mill, reactivity, crystal structure, apatite.

M. Vasić, Z. Radojević

NON - ISOTHERMAL DRYING PROCESS OPTIMISATION - DRYING OF CLAY TILES IOP Conf. Series: Materials Science and Engineering 95, 2015, 12-25. doi:10.1088/1757-897X/95/1/012025 In our previous studies we have developed a model for determination of the variable effective diffusivity and identification of the exact transition points between possible drying mechanisms. The next goal was to develop a drying regime which could in advance characterize the real non isothermal process of drying clay tiles. In order to do this four isothermal experiments were recorded. Temperature and humidity were maintained at 350C / 75%; 450C / 70%; 450C / 60% and 500C / 60%; respectively in each experiment. All experimentally collected data were analyzed and the exact transition points between possible drying mechanisms were detected. Characteristic drying period (time) for each isothermal drying mechanism was also detected. The real, non isothermal drying process was approximated by 5 segments. In each of these segments approximately isothermal drying condition were maintained. Temperature and humidity of the drying air, in the first four segments, was maintained on the same level as in recorded isothermal experiments while in the fifth segment, it were maintained at 700C / 40%. The duration of the first four segments were calculated from the diagrams Deff – t respectively for each experiment. The clay tile in experiment five was dried without cracking using the proposed non isothermal drying regime.

Pregled naučnih i stručnih rezultata u 2015. godini 27 SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U IZVODU (M34)

A. Terzić, L. Pezo, Lj. Andrić, Z. Radojević

OPTIMIZATION OF MECHANICAL ACTIVATION OF DIFFERENT RAW MATERIALS USED IN PRODUCTION OF HIGH- TEMPERATURE CERAMICS Serbian Ceramic Society Conference Advanced Ceramic and Application IV – New frontiers in multifunctional material science and processing, Belgrade, 2015, 69. The assessment of the activation process variables influence on the final quality of the product parameters was conveyed in order to optimize the mechanical treatments of the different raw materials (mica, talc and alumina) used in the production of high-temperature ceramics. The modification in the behavior of activated samples has been correlated to the particle size distribution effect produced by activation via an ultra-centrifugal mill. The differences in the set of the process parameters determined before and after raw materials activation and their influence on the grain-size distribution related characteristics have been studied. The mechanical treatments are regarded as either energetically or economically unsustainable procedures, therefore the activations were optimized on basis of assessment of the process variables (number of rotor revolutions, current intensity, activation period, circumferential rotor speed and mill capacity) effect on the final quality of product parameters (mesh sizes of the sieves, accumulated retained masses, average grain size, level of micronization kinetics, mesh size appropriate to 95% of accumulated passing mass and specific surface area). The activated product parameters in all experimental sequences were obtained by the analytical procedure based on Rosin-Rammler-Sperling equation. Response Surface Method, Standard Score Analysis and Principal Component Analysis were used as means of the optimization. The established mathematical models were able to precisely predict the quality parameters in a broad range of processing parameters. Developed models showed r2 values in the range of 0.714- 0.988 for investigated raw materials. Standard Score Analysis highlighted that the optimal sample was obtained using sieve mesh of 80μm set of processing parameters (SS=0.81) for mica, sieve mesh of 120μm set of processing 28 Institut za ispitivanje materijala a.d. Beograd parameters (SS=1.0) for talc, and sieve mesh of 120μm set of processing parameters (SS=0.96) for alumina. Multiple comparison tests revealed that the optimal variation in the processing parameters could reduce the negative effect of raw materials inherent properties on the final score which would improve energetic and economic sustainability of the activation applied for the processing of raw materials utilized in production of high-temperature ceramics. Keywords: mica; talc; alumina; ceramics; grain size; thermal applications; analytical modeling.

A. Terzić, Lj. Andrić, Lj. Miličić, Z. Radojević

ENERGY TRANSFER AND CONVERSION RECORDED ON MECHANICALLY ACTIVATED FLY ASH GRAINS 3rd International Conference Modern Technologies in Industrial Engineering – Mod Tech 2015, Mamaia, Romania, 2015, 64. The fly ash activation through mechanical milling is usually applied to improve the ash properties in order to get composite materials with higher characteristics. The activation technology based on mechanical energy action applied on treated materials and is conducted by ultra-fine milling. In order to increase the reactivity of lignite coal fly ash this paper focuses on optimization of mechanical activation period. Also, the influence of the ash activation parameters on the grain-size distribution related characteristics was studied during this research. The ash grain inertia measurement through automatic grain counter (AGC) was performed. Due this mechanically activated grains are the most convenient mineral form for measurement of grain inertia since energy change that occurs in the mill material system is recorded by them. The ash grains energy and properties could be changed by mechanical forces. The ash was thoroughly analyzed, particularly in its activated state, primarily by means of the X-ray diffraction method for a reliable identification of the crystal phases and changes in the crystallinity, followed by comparison of the SEM microphotographs of its initial and activated state. Keywords: milling; grain size; ceramic materials; mechanical activator; recycling. Pregled naučnih i stručnih rezultata u 2015. godini 29

Z. Radojević, A. Terzić, M. Vasić, M. Arsenović

NON-TYPICAL DEFECTS ON SURFACES OF CERAMIC AND ROOF TILES: NATURE AND THE CAUSES 3rd International Conference Modern Technologies in Industrial Engineering – Mod Tech 2015, Mamaia, Romania, 2015, 255. This research was conducted to identify the nature and the cause of non-typical defects which appeared on the visible surfaces of ceramic and roof tiles. Microstructural analysis was conducted via optical microscope and scanning electron microscope coupled with energy dispersive spectrometer. Ceramic tiles contained black spots and dark brown clusters with yellow halos. Black spots originated from carbon contained in starting glaze raw materials. EDS analysis of clusters of dark-brown color in the pores showed the presence of Fe, which is found to affect the quality of the visible tile surface. Non-homogeneities on the roof tiles surfaces appeared in the form of stains and manifested after immersions in water or aspersing water on the tile surface. The cause of inhomogeneities was a local phenomenon due to the porous structure of micro cracks caused by coarse metallic grains that are imported with the raw materials. Keywords: ceramic tiles; roof tiles; surface defects; impurities; microstructural analysis.

A. Terzić, Lj.Kocić, V. Mitić, Z.Radojević, Lj. Pavlović, V. Pavlović

THE APPLICATION OF FRACTAL ANALYSIS IN INVESTIGATION OF SYNTHESIZED Α-ALUMINA MICROSTRUCTURE AND PROPERTIES Serbian Ceramic Society Conference Advanced Ceramic and Application IV – New frontiers in multifunctional material science and processing, Belgrade, 2015, 70. The structure and performances of high temperature ceramic materials based on alumina is controlled by application of different technological methods for induction of transition of Al2O3 from its gamma to alpha phase. The thermo- mechanical synthesis is one of the most frequently applied methods in the production of α-Al2O3. This procedure requires extensive mechanical milling of the γ-Al2O3, which is combined with thermal treatment. In this paper, the 30 Institut za ispitivanje materijala a.d. Beograd microstructure and grain-size related properties of alumina in a variety of its transformations have been investigated. Also, the impact of the mechanical processing parameters on the alumina grain-size distribution affiliated characteristics and on the γ to α phase transformation rate were studied. The moderation in the alumina samples behavior has been correlated to the granulometric and mineralogical changes induced by activation via an ultra- centrifugal mill. Microstructural investigations were carried out using scanning electron microscope equipped with energy dispersive spectrometer. Grain size distribution was determined via cyclo-sizer. The new correlation between microstructure and obtained properties of activated alumina, based on fractal geometry and contact surface probability, has been developed. Using the fractals and statistics of the grains contact surface, a reconstruction of microstructure configurations, as grains shapes or intergranular contacts, has been successfully done. Obtained results indicated that fractal analysis and statistics model for contact surfaces of different shapes were very important for the prognosis of α-

Al2O3 microstructure and properties. The morphology of alumina grains highlighted the validity of developing new structure analytical methods, based on different grains’ shape geometries. The grains contact model based on ellipsoidal geometry was presented as new modeling tool for structure research of activated alumina. The directions of possible material properties prognosis are determined according to the correlations synthesis–structure–property. The statistical approach to the investigation of activated Al2O3 grains will improve energetic and economic sustainability of the activation applied in the processing of alumina used in production of high-temperature ceramics.

Kywords: Al2O3; high-temperaturte ceramics; grain size; thermal applications; microstructure; fractals; grain contact surface.

Pregled naučnih i stručnih rezultata u 2015. godini 31 SAOPŠTENJE SA SKUPA NACIONALNOG ZNAČAJA ŠTAMPANO U CELINI (M63)

M. Arsenović, L. Pezo, S. Stanković, Z. Radojević

PREDVIĐANJE KVALITETA OPEKARSKIH PROIZVODA NA OSNOVU HEMIJSKOG SASTAVA POLAZNE SIROVINE Nacionalna konferencija sa međunarodnim učešćem Građevinski materijali u savremenom graditeljstvu, DIMK, Beograd, 2015, 59-66. Kvalitet opekarskih sirovina značajno varira u pogledu hemijskih, mineraloških, granulometrijskih i keramičko-tehnoloških karakteristika. Da bi se utvrdile matematičke zakonitosti, analizirano je 139 uzoraka opekarskih sirovina iz Srbije. Utvrđeno je da je matematički model koji najbolje opisuje vezu između sadržaja makro oksida u sirovinama i osobina pečenih proizvoda u obliku polinoma drugog reda (r2 vrednosti između 0,926-0,967). Razvijeni modeli su u stanju da predvide osobine pečenih opekarskih proizvoda u širokom spektru sadržaja oksida i temperature pečenja. Pomoću analize varijanse dobijenih modela utvrđeno je da su najvažniji parametri koji utiču na čvrstoću pri pritisku temperatura pečenja (kvadratni članovi u modelu), kao i sadržaj CaO i SiO2. Na upijanje vode se pokazalo da su najuticajniji sadržaji CaO i SiO2 (kvadratni članovi). Ključne reči: opekarske sirovine, gotovi proizvodi, predviđanje osobina.

M. Vasić, Z. Radojević

PROUČAVANJE UTICAJA REŽIMA SUŠENJA NA KVALITET OPEKARSKIH PROIZVODA Građevinski materijali u savremenom graditeljstvu, Beograd, 2015, 101-110. Proces sušenja opekarskih proizvoda u komornim i tunelskim sušarama spada u procese sa znatnim utroškom energije. Uvođenje novih termotehničkih postrojenja visokih performansi zahteva definisanje režima sušenja u zavisnosti od svojstava sirovine od koje je proizvod oblikovan. U radu su prikazani rezultati istraživanja keramičko – tehnoloških svojstava jedne domaće opekarske sirovine a zatim i rezultati proučavanja ponašanja pri sušenju oblikovanih uzoraka. 32 Institut za ispitivanje materijala a.d. Beograd

Eksperimentalna istraživanja su obuhvatila praćenje linearnog skupljanja, kinetike sušenja oblikovanih pločica kao i određivanje fizičko – mehaničkih karakteristika osušenih i naknadno pečenih pločica. Analiza dobijenih podataka omogućila je definisanje predloga režima sušenja koji je usklađen sa prirodom i karakteristikama ispitivane opekarske sirovine. Ključne reči: sušenje, opekarski proizvodi, režim sušenja.

Pregled naučnih i stručnih rezultata u 2015. godini 33

T 210 T 210 MECHANICAL MAŠINSTVO, ENGINEERING, HIDRAULIKA, HYDRAULICS, VAKUUMSKA VACUUM TECHNOLOGY, TEHNOLOGIJA, VIBRATION AND ACOUSTIC VIBRACIJE ENGINEERING I AKUSTIČKI INŽENJERING 34 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA SKUPA NACIONALNOG ZNAČAJA ŠTAMPANO U CELINI (M63)

A. Milenković, D. Boljević

PRIKAZ SOFTVERA ZA STATISTIČKU ANALIZU REZULTATA MONITORINGA BUKE U ŽIVOTNOJ SREDINI 59. konferencija ETRAN 2015. i 2. internacionalna konferencija IcETRAN 2015, Srebrno jezero, 2015. U ovom radu je prikazano softversko rešenje SAN−B ver. 2.1 (Statistička analiza nivoa buke) koje omogućava obradu rezultata monitoringa buke u životnoj sredini. Softver je napravljen u skladu sa standardima SRPS ISO 1996-1 i SRPS ISO 1996-2 i njime se vrši obrada i analiza podataka kontinualnih merenja buke. U radu su obrađeni tehnički detalji koji su u vezi sa samom problematikom obrade podataka, a najveći deo pažnje je posvećen objašnjenju samog softvera. Grafički korisnički interfejs (GUI) je urađen u programskom paketu Visual Basic 6.0. Ključne reči: monitoring buke u životnoj sredini; softver.

Aleksandar Milenković, Danica Boljević, Damir Savković

KAMENA VUNA KAO IZOLACIONI MATERIJAL U GRAĐEVINSKOJ AKUSTICI Nacionalna konferencija sa međunarodnim učešćem Građevinski materijali u savremenom graditeljstvu, Beograd, 2015. U građevinskoj akustici, odnosno zvučnoj zaštiti objekata, koriste se raznorodni materijali za izolaciju od zvuka, kako vazdušnog kroz zidove i tavanice tako i zvuka udara kroz međuspratne konstrukcije, a sve u cilju poboljšanja uslova prijatnijeg življenja i rada u zgradama. Postoji više mogućih načina poboljšanja tih uslova i u ovom radu će akcenat biti stavljen na izbor ispune za zvučnu izolaciju u zidovima i podovima. U radu će biti prikazani rezultati laboratorijskih ispitivanja akustičkih parametara pregradnih zidova i plivajućih podova sa kamenom vunom različitih zapreminskih gustina, debljina i koeficijenata zvučne apsorpcije, a u cilju odabira optimalnog rešenja za zahtevani kriterijum zvučne zaštite. Pregled naučnih i stručnih rezultata u 2015. godini 35

Ključne reči: zvučna izolacija, kamena vuna, koeficijent zvučne apsorpcije, pregradni zid, plivajući pod.

D. Boljević, A. Milenković, D. Savković

UTICAJ MINERALNE VUNE NA POBOLJŠANJE ZVUČNE IZOLACIONE MOĆI LAKIH MONTAŽNIH ZIDOVA OD GIPS-KARTONSKIH PLOČA 59. konferencija ETRAN 2015. i 2. internacionalna konferencija IcETRAN 2015, Srebrno jezero, 2015. U poslovnim objektima laki montažni pregradni zidovi od gipskartonskih ploča su uglavnom zamenili teške homogene zidove od opeke i bloka. U stambenim objektima istina i dalje se kao pregradni koriste homogeni zidovi od cigle i bloka, ali svakako pri adaptaciji stanova laki montažni zidovi su prvi izbor. Ono što ovakve zidove izdvaja je njihova laka konstrukcija, iako se njihove akustičke osobine mogu porediti sa „teškim“ zidovima. U zavisnosti od zahteva za vrstom pregrade odnosno od položaja takvog zida u objektu izbor tipa montažnog zida nije nimalo lak, s obzirom na to da njihove akustičke osobine zavise od vrste gipskartonskih ploča, njihove debljine, broja, ali i izbora ispune od mineralne vune kao izolacionog materijala. U radu su prikazani eksperimentalni rezultati merenja izolacione moći zida koji pokazuju doprinos mineralne vune kao i uticaj izbora vrste mineralne vune u zidu od gips-kartonskih ploča, na zvučnu izolaciju. Ključne reči: zvučna izolacija, mineralna vuna, zvučna apsorpcija, laki montažni pregradni zid.

D. Boljević, A. Milenković, D. Savković

PRIKAZ REZULTATA MEĐULABORATORIJSKOG POREĐENJA NACIONALNIH AKREDITOVANIH LABORATORIJA IZ OBLASTI MERENJA NIVOA BUKE NA OTVORENOM PROSTORU 23. telekomunikacioni forum TELFOR 2015, Beograd, 2015. Međulaboratorijska poređenja iz oblasti merenja nivoa buke u životnoj sredini u organizaciji Provajdera za ispitivanje osposobljenosti Instituta IMS u Beogradu organizovana su u avgustu mesecu ove godine na otvorenom prostoru kao deo 36 Institut za ispitivanje materijala a.d. Beograd standardnog monitoringa nivoa buke prema ažurnoj verziji metode date u standardu (SRPS) ISO 1996-2 i za slučaj koji odgovara merenju nivoa buke u slobodnom polju. U međulaboratorijskom poređenju učestvovalo je sedam akreditovanih laboratorija, od kojih su četiri bile inostrane, a tri laboratorije iz Srbije. Ključne reči: međulaboratorijsko poređenje, monitoring buke, vrednovanje performansi učesnika.

H. Kurtović, A. Milenković, D. Boljević

PROVERA MOGUĆNOSTI DA SE PRORAČUNOM ODREDI LABORATORIJSKA VREDNOST IZOLACIONE MOĆI LAKE DVOSTRUKE PREGRADE Zbornik radova 59. konferencija ETRAN 2015. i 2. internacionalna konferencija IcETRAN 2015, Srebrno jezero, 2015. U proračunima zvučne izolacije između prostorija na osnovu normi EN12354 polazi se od izolacione moći pregrada izmerene u laboratoriji, pa bilo bi od velike koristi da kao orijentacija može da posluži neki računski postupak koji bi se takve vrednosti mogle dobiti. Pokazalo se da ni u novijoj ni u starijoj literaturi nema obrazaca po kojima bi se, bar približno, proračunala laboratorijska izolaciona moć dvostruke pregrade izložene difuznom zvučnom polju, što je osnovni podatak potreban za proračun. Izuzetak od male koristi za praksu je slučaj normalne incidencije. U ovom radu su prikazani rezultati merenja izolacione moći raznih tipova lakih gipsanih pregrada. Na osnovu dobijenih rezultata analiziran je jedna metod proračuna izolacione moći koji bi dao približno iste rezultate. U radu je prikazano šta je sve potrebno poznavati i u čemu su poteškoće da se ovaj cilj postigne. Ključne reči: zvučna izolacija, pregrade između prostorija, merenja, proračun. Pregled naučnih i stručnih rezultata u 2015. godini 37

M. Mijić, A. Milenković, D. Boljević, Ž. Flajs, D. Šumarac

DINAMIČKA POBUDA ENTERIJERSKIH OBLOGA U PROSTORIJAMA SA OZVUČENJEM U KOME SE KORISTE SABVUFER ZVUČNICI Zbornik radova 59. konferencija ETRAN 2015. i 2. internacionalna konferencija IcETRAN 2015, Srebrno jezero, 2015. Savremena tehnologija audio sistema ustanovila je kao standard upotrebu sabvufera u sistemima za ozvučavanja koncertnih i pozorišnih sala. Vremenom je to postalo sastavni deo estetike savremene muzike, pa su sabvuferi neizostavni čak i u kafićima. U takvim prostorima je konstatovano da se pri uobičajenim nivoima reprodukcije zvuka javljaju značajne vibracije enterijerskih obloga, pa su registrovane pojave oštećenja staklenih svetiljki i sličnih detalja u enterijeru. Zbog toga je organizovano merenje nivoa vibracija na enterijerskim oblogama u prostorima u kojima se koriste sabvuferi. U radu su prikazani rezultati takvih merenja. Zaključeno je da postoji potreba za definisanjem minimalnih mehaničkih kriterijuma za realizaciju enterijera gipsanim oblogama kojim bise sprečile negativne posledice nastale primenom sabvufera. Ključne reči: dinamička pobuda, prostorije sa ozvučenjem, sabvufer zvučnici, enterijerske obloge.

38 Institut za ispitivanje materijala a.d. Beograd

Pregled naučnih i stručnih rezultata u 2015. godini 39

T 220 T 220 CIVIL ENGINEERING, GRAĐEVINARSTVO, HYDRAULIC ENGINEERING, HIDRAULIKA, OFFSHORE TECHNOLOGY, PRIOBALNA SOIL MECHANICS TEHNOLOGIJA, MEHANIKA TLA 40 Institut za ispitivanje materijala a.d. Beograd RAD U TEMATSKOM ZBORNIKU VODEĆEG MEĐUNARODNOG ZNAČAJA (M13)

D. Berisavljević, N. Šušić, D. Rakić

SDMT – A TOOL FOR IN SITU IDENTIFICATION OF COLLAPSIBLE SOILS Third international conference on the flat dilatometer, DMT’15, Rome, 2015, 457-463. Loess is a wind blown sediment characterized by an open structure. When moistured or excessively loaded loess structure may collapse causing major problems for engineering structures. Identification of vertical and horizontal distribution of collapse prone zones in this type of soil is a first task of geotechnical investigations. The paper presents two possible ways of identifying collapse prone zones based on SDMT results. Reliability of constrained modulus determined from DMT is also addressed. Keywords: dilatometer, loess, collapse, intermediate parameters, constrained modulus.

Pregled naučnih i stručnih rezultata u 2015. godini 41 RAD U MEĐUNARODNOM ČASOPISU (M23)

G. Hadži-Niković, K. Ðoković, S. Vujić.

EFFECT OF MATRIC SUCTION ON ACTIVE EARTH PRESSURE IN SILTY SOIL Journal of Mining Science, 2015, Vol. 2, No. 2, 66-75. Retaining structures are often driven at shallow depth well above the ground water table where the soil is in a state of unsaturated condition. Estimation of active earth pressure, which is very important in design of these structures, is based on extending Rankine theory of earth pressure with respect a functional relationship between the active pressure for an unsaturated soil and matric suction. For an unsaturated silty soil, well and long-term above the ground water table, it was determined the angle b on the basis of soil water characteristic curves SWCC. For different depth of retaining walls and various matric suction values, which can be constant or linear decreasing with depth, active earth pressure and critical height of vertical unsupported excavation were determined. The results in this paper confirm that matric suction in terrain decreases the value of active pressure force on the retaining wall and considerably increases the critical height of vertical unsupported slope. Keywords: unsaturated soil, matric suction, soil-water characteristic curve, laboratory testing, active pressure, stability of vertical slope.

J. Ćirilović, G. Mladenović, C. Queroz

IMPLEMENTATION OF PREVENTIVE MAINTENANCE IN NETWORK-LEVEL OPTIMIZATION, CASE STUDY OF THE SERBIAN LOW-VOLUME ROAD NETWORK Transport Research Record, Vol. 2, 49-55. Application of appropriate preventive maintenance (PM) treatments, at the right time, extends the service life of pavements, resulting also in various benefits: (i) to road users in terms of increase of ride comfort and safety; and (ii) to road agencies, in the reduction of future maintenance costs and improvement of the network condition. While PM treatments have usually been applied on the highly 42 Institut za ispitivanje materijala a.d. Beograd trafficked sections of the Serbian national road network, they have not been applied on the low volume part of the network. The objective of this paper is to identify appropriate PM treatments for low volume roads (LVR), model them into pavement management system (PMS), and assess the potential benefits of their application compared to the current practice, using the Serbian LVR network as a case study. The World Bank’s Road Network Evaluation Tools (RONET) model, designed to assess the current characteristics of road networks and their future performance depending on different levels of interventions (and budgets), was selected for this study. The model was modified under the study to incorporate use of PM treatments. Modifications included adjustment of the pavement deterioration curves to incorporate slower deterioration rate due to the application of crack sealing and pothole patching, as well as surface dressings or thin overlays while the pavement is still in good condition. The results indicate that the use of preventive maintenance treatment would result in increased net benefits and substantial reduction in future road agency costs compared to the maintenance scenario without preventive maintenance. Keywords: preventive maintenance, road agency costs, RONET.

Z. Berisavljević, D. Berisavljević, V. Čebašek

SHEAR STRENGTH PROPERTIES OF DIMITROVGRAD FLYSCH, SOUTHEASTERN SERBIA Bull. eng. geol. environ., Springer, Vol. 74 (3), 2015, 759-773. 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 m high, 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 Pregled naučnih i stručnih rezultata u 2015. godini 43 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 SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M33)

Hadži-Niković G ., Rakić D., Đoković K.

EFFECT OF CHANGES IN MATRIC SUCTION ON SLOPE STABILITY IN NATURAL UNSATURATED SOIL XVI Conf. ECSMGE – Geotechnical Engineering for Infrastructure and Development, Edinburgh, 2015, 1561-1566. Stability analyses were performed for a real engineering-geological cross-section of unsaturated Quaternary silt sediments. Unsaturated shear strength is a function of the two stress variables: net normal stress and matric suction. Constitutive equations (unsaturated shear strength – matric suction) and (angle b – matric suction) were defined for these silty soils. These equations were established on the basis of primary constitutive relationships for unsaturated soils by soil-water characteristic curves (effective degree of saturation – matric suction). Soil-water characteristic curves were obtained from results of experimental tests on draining saturated soil samples under different pressures, performed for the first time in Serbia, in a 15 bar pressure plate extractor, according ASTM. Effective shear strength parameters c’ and ’ were also experimentally obtained from direct shear tests. Stability analyses were performed using the GLE method for different climate conditions, before and after rainfall, i.e. for different values of matric suction. Stability analyses were performed for the same groundwater level, too. It was confirmed that rainfall decreases the angle b and stability of natural unsaturated soil slopes. Decreasing the b angle of unsaturated soil, due to rainfall, decreases the safety factor of the slope faster for coarse-grained soil than for finegrained soil.

Keywords: unsaturated soil, matric suction, slope stability, natural unsaturated soil. Pregled naučnih i stručnih rezultata u 2015. godini 45

K. Đoković, J. Ćirilović, N. Šušić, G. Hadži-Niković

CORRELATIONS DEPENDENCE OF INDEX PROPERTIES AND COMPACTION PARAMETERS OF SOIL 9th International Conference: Assesment, maintance and rehabilitation of structures and settlements, Zlatibor, Serbia, 2015, 99-106. 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), plasticity index (PI), grain-size distribution and specific gravity (Gs). The samples belong to various clay types, and were obtained from cores from four earthfill dams: Rovni, Selova, Prvonek and Barje, and were control samples during soil compaction. The developed models can be used to estimate the compaction parameters: (i) in the preliminary stages of the project development, and (ii) in the course of the preliminary assessment of the suitability of a material from borrow pits for use in earthfill structures. Keywords: clay, compaction, earthfill dams, regression analyses.

K. Đoković, L. Čaki, N. Šušić, G. Hadži-Niković

RESEARCH DISPERSIVE FINEGRAIN SOILS BY PINHOLE TEST 6th International Conference Geotechnics in Civil Engineering, Vršac, 2015, 169- 174. Dispersive clays are unfavorable soils for the construction of earth structures, especially the core of earth dams, river embankments and road embankments. In the study of dispersive soils one of the main problems is the identification of this soil. Namely, the dispersive soils can not be identified by the standard identification-classification tests such as sieve analysis or tests of plasticity. The paper presents the results of identification and classification dispersive fine grain soil by pinhole test.

Keywords: dispersive clays, pinhole test. 46 Institut za ispitivanje materijala a.d. Beograd

N. Šušić, D. Berisavljević, M. Prica, K. Đoković

DLT-TEST: DETERMINING PILE BEARING CAPACITY USING A DYNAMIC METHOD Over the past several years, the use of DLT method for determining pile load- bearing capacity has been intensified both globally and domestically, as an alternative to static load tests. The main advantage of the DLT over static tests is reflected in the fact that it saves both time and money. The paper presents theoretical bases of the DLT method as well as the manner of its application in- situ. In conclusion, the paper offers an analysis of results and a procedure for determining bearing capacity of piles, using the DLT method. Keywords: pile, bearing capacity, dynamic method, principles, stress waves, weights, sensors.

R. Spielhofer, N. Vajdić, J. Ćirilović, G. Mladenović

CROSS-ASSET RISK ASSESSMENT (X-ARA) IABSE Conference – Structural Engineering: Providing Solutions to Global Challenges, 2015, Geneva, Switzerland, 977-985. This paper presents an outline of the CEDR Transnational Road Research Programme funded research project “X-ARA – cross asset risk assessment”. Objective and scope of the project are described and the approach is outlined. The main part of this paper presents the findings of a desk study, carried out during the project, on literature related to risk assessment in asset management and the current practice on risk assessment of several European road operators. Keywords: Asset management, cross asset management, risk assessment, road infrastructure.

Pregled naučnih i stručnih rezultata u 2015. godini 47 RAD U ČASOPISU NACIONALNOG ZNAČAJA (M52)

Z. Berisavljević, D. Berisavljević, V. Čebašek, D. Rakić

ANALIZE STABILNOSTI POKOSA METODAMA GRANIČNE RAVNOTEŽE I SMANJENJA PARAMETARA ČVRSTOĆE TLA Građevinar, Croatian association of civil engineers, Vol. 67, 2015, 975-983. U ovom su radu predstavljeni rezultati usporedne analize stabilnosti pokosa metodama granične ravnoteže i smanjenja parametara čvrstoće tla. Razmatrano je nekoliko pokosa uzetih iz literature ili iz geotehničke prakse. Analiziran je utjecaj vlačnog naprezanja, raspodijeljenog opterećenja, veličina konačnog elementa i parametri modela na lokaciji te oblik kritičnog loma i odgovarajuće vrijednosti faktora sigurnosti. Obje navedene metode daju slične rezultate ako se ispravno primijene u odgovarajućim računalnim programima. Ključne reči: granična ravnoteža, smanjenje parametara čvrstoće, dilatancija, optimizacija, Bezijeova krivulja, vlačna zona.

48 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA SKUPA NACIONALNOG ZNAČAJA ŠTAMPANO U CELINI (M63)

D. Berisavljević, N. Šušić, D. Rakić, G. Hadži-Niković, Z. Berisavljević ODREĐIVANJE VRSTE TLA I MIROSTRUKTURE IZ SDMT OPITA Šesto naučno-stručno međunarodno savetovanje Geotehnički aspekti građevinarstva, Savez građevinskih inženjera Srbije, 2015, 175-185. U radu je prikazan dijagram za određivanje vrste tla i prisustva mikrostrukture u tlu na osnovu rezultata SDMT opita. Vrsta tla se određuje iz veličina prelaznih parametara (ID i KD) koji su rezultat mehaničkog DMT opita, a prisustvo mikrostrukture se određuje na osnovu veličine maksimalnog modula smicanja

(G0) koji se dobija merenjem brzine smičućih talasa (Vs) u tlu korišćenem seizmičkog modula prilikom izvođenja opita. Validacija dijagrama izvršena je primenom rezultata dobijenih iz SDMT opita izvedenih na teritoriji Republike Srbije i rezultata preuzetih iz literature.

Ključne reči: seizmički dilatometar (SDMT), mikrostruktura, maksimalni modul smicanja (G0).

Z.Berisavljević, D.Rakić, N.Šušić, D.Berisavljević

DEFINISANJE PARAMETARA ČVRSTOĆE NA SMICANJE HETEROGENE FLIŠNE STENSKE MASE - DEO I (INŽENJERSKO GEOLOŠKE KARAKTERISTIKE) Šesto naučno-stručno međunarodno savetovanje Geotehnički aspekti građevinarstva, Savez građevinskih inženjera Srbije, 2015, 129-139. Ovo je prvi deo studije pod nazivom: “Definisanje parametara čvrstoće na smicanje heterogene flišne stenske mase”. U ovom delu prikazane su inženjerskogeološke karakteristike heterogenih flišnih sedimenata okoline Dimitrovgrada. Flišni sedimenti su veoma zastupljeni u našoj zemlji. Procenjuje se da je oko 15-20% trase autoputnih koridora izvedeno, ili će biti izvedeno, u flišu. Iz ovog razloga je veoma važno poznavati parametre smičuće čvrstoće fliša, koji su neophodni za procenu stabilnosti kosina. Litološka heterogenost i tektonska oštećenost čini ove materijale izuzetno nezahvalnim za rad. U zavisnosti od procentualnog učešća pešćčara i siltita izdvojeno je pet bitno Pregled naučnih i stručnih rezultata u 2015. godini 49 različitih strukturnih tipova. GSI vrednost je određena na bazi kvantifikovanog GSI dijagrama. Ispitivanje mineraloškog sastava pod mikroskopom omogućilo je detaljniju karakterizaciju stenske mase. Ključne reči: smičuća čvrstoća, GSI, SCR parameter.

Z.Berisavljević, D.Rakić, N.Šušić, D.Berisavljević

DEFINISANJE PARAMETARA ČVRSTOĆE NA SMICANJE HETEROGENE FLIŠNE STENSKE MASE - DEO I (GEOTEHNIČKE KARAKTERISTIKE) Šesto naučno-stručno međunarodno savetovanje Geotehnički aspekti građevinarstva, Savez građevinskih inženjera Srbije, 2015, 139-150. Ovo je drugi deo studije pod nazivom: “Definisanje parametara čvrstoće na smicanje heterogene flišne stenske mase”. Parametri smičuće čvrstoće definisani su prema tri kriterijuma: Mohr-Coulomb-ovom, Hoek-Brown-ovom i nelinearnoj anvelopi hiperboličkog tipa. Koristeći dostupne literaturne podatke određene su gornja i donja granična vrednost parametara za generalnu flišnu sekvencu uz pomoć nelinearne hiperboličke anvelope. Verifikacija parametara prikazana je u posebnom radu i ovde nije detaljnije razmatrana.

Ključne reči: smičuća čvrstoća, GSI, hiperbolička anvelopa, LMA algoritam.

50 Institut za ispitivanje materijala a.d. Beograd BITNO POBOLJŠAN PROIZVOD ILI TEHNOLOGIJA (M84)

K. Đoković, L. Čaki, N. Šušić, G. Hadži-Niković

MODIFIKOVANI PIN-HOLE APARAT ZA ODREĐIVANJE DISPERZIVNOSTI FINOZRNOG TLA Odluka Instituta IMS br. 3-15670 od 31.12.2014.

Pregled naučnih i stručnih rezultata u 2015. godini 51

T 230 T 230 BUILDING CONSTRUCTION VISOKA GRADNJA 52 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA SKUPA NACIONALNOG ZNAČAJA ŠTAMPANO U CELINI (M63)

M. Drpić, D. Ivanišević

PASIVNA ZAŠTITA OD POŽARA U GRAĐEVINARSTVU U OKVIRU TEHNIČKE REGULATIVE U SRBIJI I U EVROPI Građevinski materijali u savremenom graditeljstvu, Beograd, 2015, 11-18. Pasivna zaštita od požara u građevinarstvu u skladu sa tehničkom regulativom u Srbiji propisana je u okviru nekoliko pravilnika i SRPS standarda. U međuvremenu, preuzet je veliki broj EN standarda i Evrokodova – kao SRPS EN. Uloga nacionalne regulative u okviru pasivne zaštite od požara u građevinarstvu je da se preuzmu opšti principi i da se uspostave specifična nacionalna pravila. Ključne reči: pasivna zaštita od požara; građevinarstvo; nacionalna pravila.

M. Todorović

TEHNIČKI PREGLED OBJEKTA IX međunarodno naučno-stručno savetovanje Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, Zlatibor, 2015, 509-516. U radu je prikazana zakonska osnova za proceduru tehničkog pregleda objekata kroz različite periode, od 1931.god. do danas važećeg Zakona o planiranju i izgradnji i Pravilnika koji reguliše tehnički pregled objekta. Na jednom konkretnom primeru iz prakse date su manjkavosti ili propusti istog kao i neki predlozi za nova rešenja u ovoj oblasti. Ključne reči: tehnički pregled, upotrebna dozvola, petlja Radnička.

Pregled naučnih i stručnih rezultata u 2015. godini 53

T 450 T450 METAL TECHNOLOGY, TEHNOLOGIJA METALA, METALLURGY, METALURGIJA, METAL PRODUCTS PROIZVODI OD METALA 54 Institut za ispitivanje materijala a.d. Beograd RAD U VRHUNSKOM MEĐUNARODNOM ČASOPISU (M21)

B. Međo, M. Rakin, N. Gubeljak, Y. Matvienko, M. Arsić, Ž. Šarkoćević, A. Sedmak

FAILURE RESISTANCE OF DRILLING RIG CASING PIPES WITH AN AXIAL CRACK Engineering Failure Analysis, Elsevier, 2015. Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are also often exposed to damages at the external surface. A pipe segment exposed to internal pressure is examined experimentally and numerically, using the finite element method. Experimental setup included tracking of crack mouth opening displacement (CMOD) values, as well as J integral. Criteria for pipe failure are determined on the finite element (FE) models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. Several 3D models with different crack sizes are evaluated. 2D plane strain models are also examined, to determine the applicability limits of this simpli-fied approach. Integrity assessment criteria for the analysed geometries are discussed. Assessment of fracture resistance of the pipeline material is also considered in this work. Besides the standard SENB specimens, Ring specimens cut from the pipe are tested, and the results are compared. Both specimen geometries are modelled using local approach to fracture, by application of the micromechanical Complete Gurson model (CGM), devel-oped by Z.L. Zhang. It is shown that the Ring specimens have similar fracture conditions under bending load as SENB specimens. Since they are much simpler to fabricate from the pipe than standard specimens, it is concluded that they can be used for assessment of fracture of the pipes with axial cracks. Keywords: Cracked pipe, Finite element analysis, Pipe-ring specimen, Micromechanical modelling. Pregled naučnih i stručnih rezultata u 2015. godini 55

Z. Odanović, M. Ristivojević, V. Milošević-Mitić

INVESTIGATION INTO THE CAUSES OF FRACTURE IN RAILWAY FREIGHT CAR AXLE Engineering Failure Analysis, 2015, Vol. 55, 169–181. Railway axles are vital parts of railway. Their failure in the form of dynamic fracture is commonly of disastrous outcomes for railway vehicles. Accordingly, railway axles are designed to be highly reliable, while the maintenance system requires regular inspection in terms of crack initiation. However, due to complex exploitation conditions, complex stress state and multiple stress concentration, railway axles often experience fatigue failures. This occurrence has been studied in a large number of papers. This paper too sheds light on the causes of fracture occurrence in the axle of railway freight car for coal transport in a thermal power plant. Detailed analyses were conducted on the axle fracture surface and mechanical properties. Also, microstructure of the axle material, as well as on exploitation conditions and stress state was examined. Calculations indicated that, apart from working load impact, the influence of press fit joints, especially of the one between the labyrinth seal and the axle is of crucial importance for the analysis of railway axle stress state. The entire numerical–experimental analysis has shown that the considered axle failure was caused by inadequate maintenance, insufficient axle strength and adverse stress state in the railway axle critical cross-sections. Keywords: railway engineering, stress concentrations, failurediagnostics, finite element analysis, non-destructive testing

M. Burzić, M. Mango, J. Bernetić, Z. Burzić, M. Arsić

EFFECT OF VARIABLE LOAD ON CRACK INITIATION MICROALLOYED STEEL S 690-QL Metallurgy, Croatian Metallurgical Society, 2015, Vol. 54, No. 1, 55-58. The accumulation of damage in the form of initiation and growth of micro-cracks 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 56 Institut za ispitivanje materijala a.d. Beograd heat-treated. The development of new methods of testing materials, and methods relevant for assessing the behavior of structural material exploitation, enabled better characterization of the mechanical and technological properties of high- strength steel. Keywords: microalloyed steel S690QL, low cycle fatigue, strain amplitude.

Pregled naučnih i stručnih rezultata u 2015. godini 57 RAD U MEĐUNARODNOM ČASOPISU (M23)

J. Dobrić, Z. Marković, D. Buđevac, Ž. Flajs

SPECIFIC FEATURES OF STAINLESS STEEL COMPRESSION ELEMENTS Građevinar, 2015, Vol. 67, No. 2,143–150. doi: 10.14256/JCE.1128.2014 Stainless steel has a number of features that define different behaviour of structural elements made of this material, as related to equivalent carbon steel elements. These properties, especially prominent in case of compression elements, are manifested through the nonlinear stress and strain relationship, pronounced influences of material hardening due to cold forming. Basic principles for the analysis of cold-formed stainless steel compression elements, either included in modern technical regulations, or resulting from current research, are presented in this paper. Keywords: stainless steel, cold forming, compression load, carrying capacity of cross-section, carrying capacity of element.

I.Atanasovska, D. Momčilović

SPUR GEAR MODEL FOR PREDICTION OF FATIGUE DAMAGE INITIATION IN CONTACT ZONE International Journal of Powertrains - Special Issue - Advanced Tooth Forms, Topologies and Computational Models for Low-vibration and/or High-power Density Geared Powertrains, Inderscience Publishers, Switzerland, 1-17. The objective of this paper is to give a new viewpoint in contact fatigue assessment in the spur gears. The presented research is based on up-to-date methods and multidisciplinary approach, and enables direct prediction of fatigue damage initiation in contact zones. The special attention is paid to the developing of model for precise simulation of spur gear teeth contact by finite element method (FEM). The contact stress calculation based on true contact involute geometry provides the stress gradients for theory of critical distances (TCD) 58 Institut za ispitivanje materijala a.d. Beograd application in damage initiation prediction. One particular spur gear pair is analysed for presenting the spur gear model developing.

R. Mitrović, I. Atanasovska, N. Soldat, D. Momčilović

EFFECTS OF OPERATION TEMPERATURE ON THERMAL EXPANSION AND MAIN PARAMETERS OF RADIAL BALL BEARINGS Thermal Science, Vinča Institute of Nuclear Sciences, Belgrade, 2015. doi:10.2298/TSCI141223091M The research of influence of operation temperature on the thermal expansion and main parameters of radial ball bearings is presented in this paper. The main bearing parameters are identified in accordance with the increasing requests concerning stability and load capacity. A series of Finite Element Analyses is performed for quasi-static analysis of all identified bearing parameters during contact period in referent temperature. Then, the dependence of bearing material characteristics on the operation temperature is discussed. Few series of Finite Element Analyses are performed for a particular radial ball bearing type, with characteristics in accordance with manufacturer specifications, for several operation temperatures. These two problems analyses include consideration of relation between the initial radial clearance, thermal expansion strains and contact deformations of the parts of the bearing assembly. The results for radial ball bearing parameters are monitored during a ball contact period for different temperatures and the appropriate discussion and conclusions are given. The conclusions about the contribution of developed procedure in defining the optimum operation temperature range are shown. Keywords: radial ball bearings, thermal expansion, main parameters, Finite Element Analysis.

S. Bošnjak, N. Gnjatović, D. Momčilović, I. Milenović, V. Gasić

FAILURE ANALYSIS OF THE MOBILE ELEVATING WORK PLATFORM Case Studies in Engineering Failure Analysis 3, 2015, 80–87. Pregled naučnih i stručnih rezultata u 2015. godini 59

This paper presents an investigation of the accident which occurred during startup of the extending structure from the transport position. In order to clarify the causes of crack occurrence along almost the entire surface of the lever cross- section, the authors performed visual, experimental (chemical composition, tensile properties, microhardness) as well as metallographic examinations. Stress states in the critical zone are defined by applying the finite element method (FEM). Based on the investigation results it was concluded that the lever breakdown is predominantly caused by both the ‘operating-in’ defect (the malfunction of the limit switch) and the ‘manufacturing-in’ defect (poor weld quality). The investigation results presented in this paper are important because same or similar problems could arise in supporting structures of various types of transportation, construction and mining machines. Keywords: Mobile elevating work platform, Failure, Experimental investigations, Finite element analysis.

60 Institut za ispitivanje materijala a.d. Beograd PREDAVANJE PO POZIVU SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M31)

V. Grabulov

FRACTURE MECHANICS AND STRUCTURAL INTEGRITY IN SOUTH EAST EUROPE – 47 YEARS OF DEVELOPMENT The 3rd IIW South East European Welding Congress, Welding and Joining Technologies for a Sustainable Development and Environment, Timisoara, Romania, 2015, 31-38. Development of fracture mechanics and structural integrity in South East Europe has been presented and analysed. As the starting point, the Magister thesis of Prof. Stojan Sedmak, 47 years ago (1968), under the supervision of Acad. Nikola Hajdin, has been taken. Keywords: Fracture Mechanics, Structural Integrity, welded joints, South East Europe. Pregled naučnih i stručnih rezultata u 2015. godini 61 SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M33)

B. Međo, M. Arsić, S. Bošnjak, V. Musrati, M. Rakin

STRESS ANALYSIS OF THE ADDITIONAL LOADING DEVICE OF THE BRIDGE CRANE FOR WEIGHTS UP TO 500 t

XXI International Conference on Material Handling, Constructions and Logistics – MHCL ’15, Vienna, Austria, 2015, 221-224. In this work, additional loading device of the bridge crane for loads up to 500t, used at the „Đerdap” Hydro power plant, is analysed. The main aim is to determine the stress state, especially the stress distribution along the cross sections at the position of the opening for weight attachment. The main reason for conducting this analysis was the fact that non-destructive examination (NDE) revealed some defects in the material. The stress values are determined using analytical and numerical methods. Both of them have shown that the safety factor value in the cross sections around the opening are acceptable, and that the material has sufficient remaining strength despite the defects observed using NDE. Keywords: Bridge crane, Loading device, Stress state, Stress concentration, Finite element method.

M. Arsić, S. Bošnjak, V. Grabulov, N. Milovanović, M. Minić, Z. Savić

REPAIR OF DAMAGES DETECTED AT THE SHAFT AND VENTILATION RING VANES OF THE HYDROELECTRIC GENERATING SET A2 GENERATOR AT THE HYDRO POWER PLANT ’PIROT’ 8th International Scientific - Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015, Slavonski Brod, Croatia, 2015, 13-17. 62 Institut za ispitivanje materijala a.d. Beograd

Hydro power plant ’Pirot’, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 mm. Pipeline, made of 22 mm thick pipes, has been designed and built without anchor blocks at curvatures, which is a rarity elsewhere. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. This paper contains the analysis of the state of the generator shaft on which the mechanical damages were detected, as well as the analysis of the state of vanes of the upper and lower ventilation ring designed for air cooling of the generator rotor where corrosion, erosion and, most of all, cavitation damages were detected, based on results of non-destructive testing (visual testing, penetrant testing, ultrasonic testing). Procedures for the rehabilitation of damaged components without disassembling them were defined. The execution of these procedures helped in saving approximately 100.000 €. Taking into account the period of time necessary to perform complete disassembling of components, as well as the period of time needed to perform reassembling, which is directly linked with the amount of energy the hydroelectric generating set A2 would produce during that period, the overall save would mount up to approximately 500.000 €. Keywords: hydroelectric generating set, turbine shaft, ventilator ring vane, damage repair.

M. Arsić, S. Bošnjak, M. Mladenović, N. Milovanović, Z. Savić

RECOMMENDATION FOR A NEW MODEL OF THE MAINTENANCE SYSTEM OF TURBINE AND HYDROMECHANICAL EQUIPMENT AT THE HYDRO POWER PLANT DJERDAP 1 6th International Symposium on Industrial Engineering – SIE 2015, Belgrade, 2015, 330-333. Turbine and hydro mechanical equipment at hydro power plant ’Djerdap 1’ is subjected to service conditions that lead to degradation of material of components and structures. Taking into account the rate of occurrence of failures (damages, accidents) and experience gained through long-term performing of tests it was established that main causes of material degradation are fatigue, corrosion, erosion and cavitation. Results of performed tests and researches carried out in order to identify the causes of material degradation, damaging and fracture of Pregled naučnih i stručnih rezultata u 2015. godini 63 components and structures of turbine and hydro mechanical equipment during the rehabilitation of the hydro power plant ’Djerdap 1’ showed that material degradation, damages and fractures occur due to the simultaneous influence of a large number of technological, metallurgical, structural and exploitational factors and that convenient structural solutions which would ensure mechanical reliability of components and structural integrity could be achieved only through absolute knowledge of their behaviour under various regimes of operation. On the basis of those results new system for maintenance of components and structures of turbine and hydro mechanical equipment was recommended. Keywords: Hydro power plant, turbine equipment, hydro mechanical equipment, maintenance system model.

M. Arsić, S. Bošnjak, V. Grabulov, M. Mladenović, M. Minić

ANALYSIS OF CURRENT STATE AND INTEGRITY EVALUATION OF THE PIPELINE AT HYDRO POWER PLANT ’PIROT’ 8th International Scientific - Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015, Slavonski Brod, Croatia, 2015, 5-12. Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. Pipeline has been designed and built without anchor blocks at curvatures, which is a rarity elsewhere. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regarding the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period. Those differences primarily refer to tangential movements of vertices marked with numbers 6, 7 and 8, which, compared to the period until year 2002, are in the range from 3 mm for vertex 8 to 5 mm for vertex 6. Apart from geodetic measurements, the 64 Institut za ispitivanje materijala a.d. Beograd measurement of pipe diameter in 2 directions is also being carried out permanently. Those data show that from year 2003 the diameter in horizontal direction started to increase significantly, while at the same time the diameter in vertical direction started to decrease less significantly. This paper contains the analysis of current state and integrity evaluation of the pipeline as a whole on the basis of results of non-destructive tests performed on the vital butt-welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing). Keywords: hydroelectric generating set, crack, repair technology, pipeline integrity.

M. Arsić, S. Sedmak, S. Bošnjak., M. Mladenović, Z. Savić

SELECTION OF STEELS FOR VITAL STRUCTURES AND TURBINE COMPONENTS OF THE HYDRO POWER PLANT ’DJERDAP 1’ 7th International Scientific and Expert Conference of the International TEAM Society – TEAM 2015, Belgrade, Serbia, 2015, 558-584. 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 hydroelectric generating sets A4, A5 and A6, non- destructive and destructive tests were carried out on parent material and weld metal in order to complete the state analysis and assessment of damage level and causes of damage occurrence at vital structures and components, which showed that the selection of suitable material has a crucial role regarding the safe operation of hydroelectric power plants. This paper contains comparative results of mechanical tests performed in order to obtain mechanical properties of materials used for the fabrication of the upper rings of guide vane apparatus installed in 1973 and made of steel St 3 (GOST 977-88) and those recently made through the use of steel S 235 (EN 10025-2), as well as for turbine covers, made of steels S 355 NL (EN 10025- 2) and S 355 NL + Z25 + N (EN 10025-3). Keywords: Refurbishment, turbine equipment, hydromechanical equipment, steel selection. Pregled naučnih i stručnih rezultata u 2015. godini 65

M. Arsić, V. Grabulov, S. Bošnjak, N. Milovanović, Z. Savić

TECHNOLOGY OF REPAIR WELDING IN ZONES WHERE CRACKS WERE DETECTED AT GENERATOR ROTOR HUBS OF HYDROELECTRIC GENERATING SETS AT HYDRO POWER PLANT DJERDAP 1 The 3rd South-East European Welding Congress Welding and Joining Technologies for a Sustainable Development and Environment, Timişoara, Romania, 2015, CD 1-4. During the refurbishment of the hydroelectric generating set A4 at the hydro power plant ’’Djerdap 1’’, its parts were subjected to experimental non- destructive tests in order to determine their condition. Cracks were detected at the casted part of the generator rotor hub, in the flange area towards the turbine shaft. They were 10–500 mm long (which was determined through magnetic particle testing) and 60-100 mm deep (which was determined through ultrasonic testing). The generator rotor hub was made of cast steel 25L, in accordance with the standard GOST 977-75. The repair methodology by welding/surface welding in zones where cracks were detected at the casted part of the generator rotor hub has to, due to the structural solution and function in service of the generator rotor, embrace a large number of details, carefully reconsider them and ensure carrying out of all activities with extreme care in order to enable the safe operation and continuous use of the hub. Overlooking, underestimation or incorrect perception of important details could cause significant problems regarding the operation of the hydroelectric generating set. This paper, due to the specificity of the performed repair methodology, contains the procedure for the dimensional check along with the surface welding technologyKeywords: fly ash, building products, toxic metals. Keywords: hydroelectric generating set, generator rotor hub, crack, repair technology. 66 Institut za ispitivanje materijala a.d. Beograd

S. Kirin, A. Tawengi, A. Sedmak, V. Grabulov

APPLICATION OF DESIGN OF EXPERIMENT TO WELDED JOINT TESTING The 3rd South-East European Welding Congress Welding and Joining Technologies for a Sustainable Development and Environment, Timişoara, Romania, 2015, CD 61-64 This present paper deals with the optimization of welding input process parameters to obtain sufficient crack propagation resistance of high strength low alloyed (HSLA) NIONIKRAL-70 steel welded joints, made by shielded manual metal arc welding (SMAW) process. The Taguchi’s philosophy has been applied with L4 orthogonal array design and experiments have been accordingly conducted with two different levels of process parameters e.g. preheating temperature, heat input and electrode strength. Fracture toughness was measured for each trial and results used to obtain the optimal welding parameter combination. Keywords: NIONIKRAL 70, Shielded metal arc welding, Fracture toughness, Design of Experiment.

Z. Odanović

AN ANALYSIS OF HYDROPOWER TURBINE GOVER MATERIAL DEGRADATION The 3rd South-East European Welding Congress Welding and Joining Technologies for a Sustainable Development and Environment, Timişoara, Romania, 2015, CD, 5. Components in a hydropower turbine generator undergo timedependent degradation processes such as multiaxial stresses, fatigue and corrosion. Therefore, it is desirable to prevent inservice damages, improve reliability and extend the operational life of the plant. Plant operation can lead to cracks, damages and failures forming in homogeneous materials and there is a need for weld repair on plant components, but repair work can be expensive and timeconsuming. Standard procedure before weld repairing require investigations based on NDT (Non Destructive Test) methods to define the condition of component materials and welded joints and to identify possible presence of Pregled naučnih i stručnih rezultata u 2015. godini 67 defects. The defects could be removed by machining and repaired by welding or surfacing. In case of significant and large weight components, which endured long term service, it is necessary to perform additional investigations based on destructive test methods to define eventual parent material degradation and to indicate suitability of weld repairing of the component. In this study additional analysis of the mechanical properties and microstructural features were performed on a hydropower turbine cover which was in service for 40 years. The performed analysis suggested that in this case and in similar cases of weld repairing of the equipment and industrial facilities with high security requirements, beside inspection using nondestructive technique (NDT), destructive tests should be performed to define base material degradation and before final decision about suitability for weld repairing or decision about replacement and production of the new part.

Keywords: turbine cover, steel properties, z - direction properties, weld repair suitability.

68 Institut za ispitivanje materijala a.d. Beograd RAD U VODEĆEM ČASOPISU NACIONALNOG ZNAČAJA (M51)

M. Arsić, D. Bajić, M. Mladenović, S. Sedmak, Z. Savić

ANALYSIS OF CAUSES OF DEGRADATION OF PARENT MATERIAL AND WELD METAL OF BREECHES PIPE NR. 1 OF PIPELINE III AT HYDROELECTRIC POWER PLANT ’PERUĆICA’ Energija, 2015, Vol. 17, No. 1-2, 129-133. Hydroelectric power plant ’Perućica’, which comprises 7 hydroelectric generating sets with installed power of 330 MW, is the oldest large hydroelectric power plant in Montenegro. It was put in service in 1960. High-pressure hydroelectric power plant ’Perućica’ is a complex hydroenergetic system, comprised of the 3.335 m long concrete tunnel, surge tank with a broadening and overflow, and three steel pipelines with installed 2-side Pelton turbines with horizontal shafts. Five turbines have the nominal power of 38 MW, while two have the nominal power of 58,5 MW (307 MW overall). The biggest problems at this hydroelectric power plant occur at the structure of pipeline III, in the area of breeches pipe nr. 1. Pipeline and the breeches pipe are made of micro-alloyed steel ’Nioval 47’ (steel mill ’Jesenice’). Loads in that area, which occur during the process of performing in-service functional tasks (stationary and dynamic loads) and during the disturbed process of exploitation (non-stationary dynamic loads), lead to the increase of the level of damaging of parent material and welded joints at the structural parts of the breeches pipe (collars and anchors), which endangers the integrity of the pipeline structure as a whole. The role of the collar, over which the breeches pipe leans on the foundation, is to receive static and dynamic loads (mean pressure in the pipeline of 61 bar, specific load caused by the quantity of water in the pipeline, effect of the gravitational force) and displacements that occur due to non-stationary dynamic loads, while the anchor has the role in strengthening and balancing the mass of the breeches pipe. Significant propagation of the defect at the carrying structure of breeches pipe nr. 1, mostly at parent material of the anchor and welded joint between the collar and the anchor, as well as between the pipeline and the anchor, led to the fact that in year 2012. the breeches pipe started to lean not on the collar, but on the anchor. In this paper the results of non-destructive tests performed on parent material and Pregled naučnih i stručnih rezultata u 2015. godini 69 welded joints of structural parts of the breeches pipe (collar and anchor), as well as results of destructive tests performed on parent material of the anchor are presented. Non-destructive testing included visual testing (VT), magnetic particle testing (MT) and ultrasonic testing (UT), while destructive testing included determination of chemical composition, tensile properties, impact energy and hardness. On the basis of test results it was established that the basic cause of occurrence of damage at the carrying structure of breeches pipe nr. 1 of pipeline III, or in other words of degradation of parent material of the anchor and welded joints between the collar and the anchor and between the pipeline and the anchor, was the fact that the breeches pipe started to lean not on the collar, as is specified by design, but on the anchor which could not endure all loads that occur during service. Keywords: breeches pipe, collar, anchor, material degradation, welded joints.

Arsić M., Bošnjak S., Grabulov V., Međo B., Savić Z.

INTEGRITY OF BEAM BRACES AND THREADED SPINDLE FOR CONJOINT OPERATION OF TWO 5 MN BRIDGE CRANES Energija, 2015, Vol. 17, No. 1-2, 319-324. The beam connects two bridge cranes with the overall lifting capacity of 500 t (2x250 t) and enables their simultaneous conjoint operation during the refurbishment or capital repair of hydroelectric equipment at the hydro power plant ''Djerdap 2''. Two braces are being installed instead of two hooks when that situation occurs. Braces are loaded with 250 t (2.5 MN) each, while threaded spindle is loaded with 500 t (5 MN). Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises state analysis, behaviour and loosening diagnostics, service life evaluation and refurbishment of structures, which means that, beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw gets detected by means of non-destructive tests, this discipline also comprises structural stress state analysis. Detection of internal defects by means of ultrasonic testing was performed in order to analyze the state of braces and of the threaded spindle.On the basis of performed analytical calculations it was determined that their integrity would not be jeopardized during the refurbishment or capital repair of hydroelectric equipment at the hydro power plant ''Djerdap 2''. 70 Institut za ispitivanje materijala a.d. Beograd

Keywords: cranes, non-destructive testing, braces, threaded spindle, structural integrity.

Pregled naučnih i stručnih rezultata u 2015. godini 71

B 003 B 003 ECOLOGY EKOLOGIJA 72 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U IZVODU (M34)

N. Damjanović, Z. Davidović, T. Spasojević-Šantić

ECOLOGICAL AND ECONOMIC ASPECTS OF USE BIO- LUBRICANTS AND CONVENTIONAL LUBRICANTS The 48th Lubricants and Base Oils Symposium, Rovinj, Croatia, 2015, 25. It is believed that more than 50% of produced lubricants during and after the operation is due directly or indirectly mature to the environment. For these reasons, in areas where the application of lubricant is related to the total "loss" in the environment, there is a tendency to replace conventional oil with bio- lubricants respectively environmentally acceptable lubricants. From an environmental point of view, the advantages of using vegetable oil as compared to conventional mineral oils are non-toxicity, biodegradability, renewability, good lubricity, high flash point and viscosity index, low volatility, savings and conservation of non-renewable resources, less dependence on non- renewable resources, reduce emissions greenhouse gases and increase agricultural production. From an economic point of view, bio-lubricants price is higher compared to conventional lubricants since in production of bio-lubricants is used as a base vegetable oils (triglycerides) or synthetic fatty acid esters, and the fact that the list of components or additives is significantly limited. Accordingly, in this paper we define the "ecological footprint" of a liter conventional mineral oil compared with one liter of bio-lubricant for the lubrication of chain saws, since it is mentioned lubricant used in highly-sensitive application areas, complex forest ecosystem.The aim of this paper is to present the "pure life cycle" through LCA (Life Cycle Assessment) for both types of lubricants and environmental parameters expressed in economic terms to encourage reflection on the further development of this sector, while also raising awareness of end-users. Key words: biolubricants, ecological footprint, LCA (Life Cycle Assessment).

Pregled naučnih i stručnih rezultata u 2015. godini 73

P 420 T 150 PETROLOGY, PETROLOGIJA, MINERALOGY, MINERALOGIJA, GEOCHEMISTRY GEOHEMIJA 74 Institut za ispitivanje materijala a.d. Beograd SAOPŠTENJE SA MEĐUNARODNOG SKUPA ŠTAMPANO U CELINI (M33)

I. Delić-Nikolić, L. Kurešević, O. Vušović

SUSTAINABLE PRESERVATION OF OBJECTS AND MONUMENTS INCORPORATING NATURAL STONE 3rd international conference The importance of place, Sarajevo, 2015, 435-444. Sustainable preservation of objects and monuments incorporating natural stone demands connaissance of materials' properties, and of processes and factors initiating and controlling the deterioration. Today the exploration of weathering degradation is a separate scientific field with its own methodology, involving in situ examinations and laboratory examinations and testing. A well designed systematic approach to sustainable preservation of objects and monuments is a long-term process, starting with acquisition and analysis of data pertaining to object/monument and its history, and ending with providing suggested measures for its conservation and maintenance, plus prevention of future damage. This paper presents some of the wide span of working experience of the stone and aggregate laboratory of the IMS Institute from Belgrade. Keywords: cultural heritage, natural stone, monument preservation.

I. Delić-Nikolić, O. Vušović, L. Kurešević

CONTRIBUTION TO EXAMINATION AND TESTING OF THE HISTORICAL HERITAGE – EXAMINATION OF THE NATURAL STONE STATUE ON THE ZEMUN GYMNASIUM ROOF 9th International Conference Assessment, Maintenance and Rehabilitation of Structures and Settlements, Zlatibor, 2015, 635-642. Stone deterioration phenomenon affects, in varying degree, every stone built into edifices or monuments. It can be a consequence of the natural deterioration process due to weathering or anthropogenic impact, such as neglect, inadequate protection etc. Sustainable preservation of the monuments demands connaissance of both the deterioration processes and materials' properties. Pregled naučnih i stručnih rezultata u 2015. godini 75

This paper presents the results of examination and testing of the natural stone statue positioned at the roof of Zemun gymnasium building performed in situ and in the laboratory, and the conclusions based on these examinations. Keywords: statue, Zemun gymnasium, natural stone, stone deterioration.

M. Cocić, M. Logar,V. Tasić, S. Dević

OPERATING MODE SELECTION IN ORDER TO INCREASE THE ENERGY EFFICIENCY OF THE GLASS-CERAMIC MATERIALS PRODUCTION The Third International Conference on Electrical Power Renewable Sources, Belgrade, Serbia, 2015, 257-263. Intensive development of the human society is based on the development of the industrial production and energetics. Hence, the need for more comprehensive research and exploitation of mineral resources. The manufacturing processes of non-ferrous metals and their alloys, particularly the flotation enrichment and metallurgical processing of waste materials, cause the major environmental pollution problems. Flotation waste dumps and slag from smelters devasted large areas of land and there are sources of the permanent pollution of soil, water and air. This paper present the characterization of the Final flotation waste, originated from the RTB Bor Company, in order to examine the possibilities of its application for the production of new glass-ceramic materials Chemical and phase composition of the Final flotation waste is determined by RFA, XRPD and SEM analysis. The kinetics of sintering was studied (different modes of heating: (1 °C/min, 29 °C/min i 43 °C/min) in order to find the optimal conditions for the sintering without deformation of the body and with a minimal consumption of the electricity and time. The phase composition of the final flotation waste is determined: fayalite (40%), magnetite (25%) and glass (35%). It is determined that the heating regime of 29 °C/ min is optimal for the energy-efficient and economical production process of the glass-ceramic materials. Keywords: final flotation waste (FFW), energy efficiency, kinetics of sintering, glassceramics. 76 Institut za ispitivanje materijala a.d. Beograd

S. Dević, L. Kurešević and M. Cocić

MINERALOGICAL CHARACTERIZATION OF THE ZEOLITIC TUFFS AND ASPECTS OF ITS APPLICATION IN AGRICULTURE XXIII International conference Ecological truth ECO-IST'15, Kopaonik, 2015, 471-479. The paper is based on determining the mineralogical character of zeolitic tuff from the territory of South Serbia. Based on the results obtained using the methods of optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, differential thermal analysis and X-ray Diffraction, the mineralogical character of zeolitic tuff has been determined. Zeolite of South Serbian deposits is characterized by the presence of the mineral Clinoptilolite. Content of Clinoptilolite in zeolitic tuffs in the area of South Serbia is extremely high (ranging up to 90%), which is a great advantage in terms of its applicability. Bearing in mind the significant characteristics of the mineral Clinoptilolite for application in various industry branches, zeolitic deposits of the mentioned areas are underutilized. For this reason, the ultimate goal of this paper is to encourage the application of zeolitic tuff in various branches of agriculture. Keywords: zeolitic tuff, clinoptilolite, agriculture.

S. Dević, M. Cocić,

OPTICAL MICROSCOPY AS A METHOD OF MINERALOGICAL CHARACTERIZATION OF MATERIALS IN FERROUS METALLURGY 47th International October Conference on Mining and Metallurgy – IOC, Bor, 2015, 33-37. In the steel industry are used and produce various materials. Depending on the technological process (production of agglomerate, iron and steel, steel subsequent ladle metallurgy, continuous casting steel and others),used ore and other mineral resources. At the same time created secondary raw materials such as slag, dust and sludge. In order to control and research related to the manufacturing process or the evaluation of secondary raw materials is carried out mineralogical characterization. An important method of characterization Optical microscopy is most commonly used in combination with XRPD. The paper presents the results Pregled naučnih i stručnih rezultata u 2015. godini 77 of optical microscopy in the characterization of materials used in the ferrous metallurgy. Keywords: mineral and secondary raw materials, slag, dust.

S.Dević,

BLAST FURNACE SLAG – IMPORTANT SECONDARY RAW MATERIAL FOR IRON METALLURGY X Međunarodni simpozijum o reciklažnim tehnologijama i održivom razvoju Bor, Serbia, 2015, 44-50. Blast Furnace slag is a very important secondary raw material obtained in the technological process of iron and steel production. In addition, there is Blast Furnace slime, converter slag, mixer slag, mixer dust and other secondary raw materials. All enumerated secondary raw materials are more or less successfully applied in different industrial branches. Blast Furnace slag is mostly utilized in our country's cement industry and road maintenance. A survey of only some of the results of mineralogical-chemical testing of Blast Furnace slag in Železara Smederevo is given in this paper, which results were obtained during the characterization and control of the same in a longer time period. The selected results determine the characteristic of Blast Furnace slag, and the paper itself gives a contribution to better knowledge of this secondary raw material obtained in the iron production process. Keywords: slag, Blast furnace, secondary raw materials.

78 Institut za ispitivanje materijala a.d. Beograd RAD U VODEĆEM ČASOPISU NACIONALNOG ZNAČAJA (M51)

Z. Slović, Lj. Nedeljković, K. Raić, S. Dević

A NUMERICAL ANALYSIS AS A GOOD TOOL FOR A PREDICTION OF FINAL SULPHOR STEEL LADLE CONTENT Metallurgical and Materials Engineering, 2015, Vol. 21, No. 3, 143-154. This work presents the industrial results of sulfur level prediction at the end of vacuum degassing (VD) of low carbon Al-Si killed steels. The effect of plant conditions, such as slag chemistry, temperature, oxygen levels of the molte steel, and slag weight on desulphurization was investigated based on the measured results and thermodynamic calculations. The variables which influence steel desulfurization such as the sulfur capacity, the initial sulfur content, and the amount of ladle slag at the end of the VD process are also defined. The desulfurization procedure was numerically analyzed using the results of 31 heats under real plant conditions in which the measured final sulfur content had been reduced to less than of 10 ppm. A method for prediction of the slag amount based on the material balance of sulfur and aluminum is also presented. The values of the sulfur capacity were determined according to the well-known KTH and optical basicity based models. The obtained results of the regression equation show a predictive final sulfur level ability of R=0.911. This was proved as satisfactory.

Keywords: numerical analysis, sulphur prediction, VD degassing, Al-Si killed steels, sulphide capacity.

Pregled naučnih i stručnih rezultata u 2015. godini 79 SAOPŠTENJE SA SKUPA NACIONALNOG ZNAČAJA ŠTAMPANO U CELINI (M63)

L. Kurešević, O. Vušović, I. Delić-Nikolić

MINERALOŠKO-PETROLOŠKA I GEOHEMIJSKA KARAKTERIZACIJA PLEMENITOG KAMENA IZ LEŽIŠTA UGLJAREVAC (CENTRALNA SRBIJA) 1. kongres geologa u Bosni i Hercegovini sa međunarodnim učešćem, Tuzla, 2015, 9. Gemstone deposit Ugljarevac is situated within the ophiolite sequence, the Central deep fault of the Vardar zone, around 8 km south from Stragari in central Serbia. The deposit is of endogenic, hydrothermal origin, formed as veins and stockworks in the altered serpentinite host rock. Present gemstone types include chalcedony varieties (jasper, colourless and green chalcedony, more rarely sard and carnelian), opal, and subordinate quartz (rock crystal) and silicified magnesite. Ore body shape is difficult to infer due to field surface vegetation coverage, but it is most probably nearly isometric, but elongated along the fault zone that has served as a circulatory conduit. Petrochemical characterization of the gemstone, namely chalcedony and jasper varieties aimed at obtaining data necessary for definition of genetic process and preliminary check of the possibility of use of the present gemstone types for production of jewellery and other decorative items. Examinations have included binocular microscope examination, X-ray emission fluorescent analysis and X- ray diffraction analysis. The examination results have shown that, as in other gemstone deposits of this type in the area, gemstones have been formed in two main phases of hydrothermal activity. Since the processes of gel solidification of magnesite and jasper haven't been completed before they were impregnated with the second phase silica (colourless chalcedony veinlets), it can be concluded that the first phase has been followed by a second phase after a relatively short break in hydrothermal circulation activity, most probably caused by an intermittent tectonic activity. Regarding the gemstone potentiality, brown jasper veins are solid and completely impregnated with younger phase chalcedony, which adds to its aesthetics and 80 Institut za ispitivanje materijala a.d. Beograd hardness, and that enables the easier and cheaper (mass mechanical) processing. Red jasper on the other hand has aesthetically more pleasing colour and is impregnated incompletely with second phase silica – bluish chalcedony with agate structure and sporadic quartz geodes, but it often has poriferous zones, which must be avoided when choosing the material for processing into decorative items. Keywords: gemstone, chalcedony, jasper, Vardar zone.

O. Vušović, I. Delić-Nikolić, L. Kurešević

PRILOG REKONSTRUKCIJI ZGRADE SINAGOGE U SUBOTICI – VEŠTAČKI KAMEN SA SOKLE Međunarodna konferencija Savremena dostignuća u građevinarstvu 2015, Subotica, 2015, 23-27. Sinagoga u Subotici je sagrađena 1902. godine i proglašena je za spomenik kulture. Ona je jedno od najvrednijih srednjoevropskih ostvarenja i UNESKO je uvrstio u listu Svetske kulturne baštine. Uzorak za ispitivanja potiče od veštačkog kamena sa sokle i u radu su prezentovani rezultati hemijskih, mineraloško- petroloških ispitivanja i rezultati dobijeni na skenirajućem elektronskom mikroskopu SEM-EDS analize. Keywords: Sinagoga, spomenik kulture, ispitivanje.

O. Vušović, I. Delić-Nikolić, L. Kurešević

PRILOG ISTRAŽIVANJU I ISPITIVANJU ISTORIJSKE BAŠTINE – ISPITIVANJE VEŠTAČKOG KAMENA SA SPOMENIKA SRPSKIM RATNICIMA 1912-1918. U POLUMIRU 9. naučno-stručno međunarodno savetovanje Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, Zlatibor, 2015, 629-634. Spomenik u Polumiru kod Kraljeva je spomenik srpskim vojnicima palim u ratovima od 1912. do 1918. godine. Na ispitivanom uzorku – komadu veštačkog kamena, odnosno sitnozrnog betona koji potiče sa figure vojnika urađena su mineraloško-petrološka ispitivanja, ispitivanje zapreminske mase, upijanja vode, pritisne čvrstoće i približno određivanje komponentnog sastava. Mineraloško- Pregled naučnih i stručnih rezultata u 2015. godini 81 petrološkom analizom je utvrđeno da se veštački kamen sastoji od više slojeva sa različitim odnosom sastojaka – kamenog agregata i veziva. Agregat potiče od karbonatnih stena – pretežno krečnjaka, manjim delom mermera. Keywords: spomenik, ispitivanje, Polumir.

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Pregled naučnih i stručnih rezultata u 2015. godini 83

DOCTORAL DISSERTATIONS DOKTORSKE DISERTACIJE

84 Institut za ispitivanje materijala a.d. Beograd

Dejan Momčilović

RAZVOJ METODA ZA POVEĆANJE RADNOG VEKA I POUZDANOSTI MAŠINSKIH SISTEMA U USLOVIMA ZAMORA Doktorska disertacija odbranjena 27.02.2015. godine na Mašinskom fakultetu Univerziteta u Beogradu. U ovom radu prikazan je razvoj metoda za procenu nastanka i širenja zamornih prslina u cilju povećanja radnog veka i pouzdanosti mašinskih elemenata i mašinskih sistema u uslovima zamora. Detaljno je izložena i analizirana dostupna naučna literatura iz teorijskih postavki fenomena zamora. Posebno je analizirana primena postojećih metoda i teorija na rešavanje problema zamornih oštećenja i otkaza kod mašinskih elemenata. Razvijanje novih metoda za procenu nastanka zamornih prslina izloženo je sa različitih aspekata, s obzirom da se radi o rezultatima multidisciplinarnih istraživanja ovog fenomena, uz primenu i interkorporiranje dostupnih savremenih analitičkih , numeričkih i eksperimentalnih metoda. Posebna pažnja posvećena je verifikaciji razvijenih metoda, kroz nekoliko pristupa. Za verifikaciju su korišćeni sopstveni eksperimentalni rezultati, kao i rezultati drugih autora. U cilju boljeg razumevanja razvijenih metoda, a pre svega metodologije širokih mogućnosti primene, detaljno je opisana primena na konkretnom i veoma složenom problemu otkaza mašinskog elementa u uslovima zamornog opterećenja. Ključne reči: povećanje radnog veka, pouzdanost, radni vek, mašinski sistem, zamor, otkaz, mašinski element, lom, korozija.

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ORGANIZATION ORGANIZACIJA OF CONFERENCES STRUČNIH SKUPOVA 86 Institut za ispitivanje materijala a.d. Beograd

ŠESTO MEĐUNARODNO NAUČNO-STRUČNO SAVETOVANJE GEOTEHNIČKI ASPEKTI GRAĐEVINARSTVA Vršac, Hotel “Srbija”, 2-6. novembar 2015.

Organizatori: Savez građevinskih inženjera Srbije Srpsko društvo za mehaniku tla i geotehničko inženjerstvo Inženjerska komora Srbije GP Rasing d.o.o. Vršac Institut IMS Beograd

Uspešno održana savetovanja o geotehničkim aspektima građevinarstva na Kopaoniku 2005., u Sokobanji 2007. i 2013, i Zlatiboru 2009. i 2011. godine podstaklo je organizatore da organizuju šesto savetovanje sa istom osnovnom tematikom. Raznolikost geotehničkih uslova u našoj zemlji i socio-ekonomski odnosi u društvu, kao i položaj naše zemlje u svetu tokom poslednjih dvadeset godina, doveli su do zaostajanja za razvijenijim zemljama sveta u oblasti građevinske geotehnike. Zbog toga postoji potreba da se rezimiraju dosadašnji rezultati i dostignuća u ovoj važnoj oblasti u širokom spektru segmenata i to od metoda primenjenih geotehničkih terenskih istražnih radova, laboratorijskih ispitivanja, primene savremenih teorijskih i numeričkih postupaka, metodologije analize i projektovanja, kao i u oblasti praktične građevinske operative. Ovom prilikom razmenjena su iskustva stručnjaka različitih profila i specijalnosti koji se bave geotehnikom kao što su: građevinski inženjeri - geotehničari, inženjerski geolozi, konstruktori, hidroinženjeri i inženjeri koji se bave saobraćajnicama. Savetovanje treba da ukaže na orijentaciju glavnih pravaca razvoja ove struke koji bi odgovarali uslovima i potrebama u ovoj fazi izgradnje naše zemlje. Pored toga, to je prilika da se razmotri i stanje naše regulative u ovoj oblasti i potreba Pregled naučnih i stručnih rezultata u 2015. godini 87 njenog usaglašavanja sa najnovijim dokumentima Evrokodova koji se od nedavno primenjuju u zemljama Evropske Unije. Savetovanje je uvršteno u program obuke kontinuiranog profesionalnog usavršavanja članova Inženjerske komore Srbije.

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KONFERENCIJA GRAĐEVINSKI MATERIJALI U SAVREMENOM GRADITELJSTVU Građevinski fakultet, Beograd, 19. jun 2015.

Organizatori: Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije Institut IMS Beograd Univerzitet u Beogradu, Građevinski fakultet Inženjerska komora Srbije

Društvo za ispitivanje i istraživanje materijala i konstrukcija (DIMK) Srbije u sklopu svojih aktivnosti permanentno organizuje susrete naučnika, istraživača i stručnjaka koji se bave problematikom materijala i konstrukcija. Ovi susreti se prevashodno organizuju u cilju razmene informacija i saradnje na područjima teorijskih i eksperimentalnih istraživanja , a posebno u segmentu metodologija ispitivanja i istraživanja koje se primenjuju na tim područjima. Ove godine realizovana je jednodnevna konferencija na kojoj su inženjeri i istraživači sa najšireg područja graditeljstva imali priliku da izlože rezultate svojih istraživanja i ispitivanja na području savremenih materijala. S obzirom na to, osnovni cilj konferencije je bio da se stručnoj i naučnoj javnosti saopšte rezultati ostvareni na tom polju, kao i mogućnosti praktične primene novih materijala, uključujući tu i aspekte energetske efikasnosti i ekološke performanse materijala. Konferencija je uvrštena u Program permanentnog usavršavanja članova Inženjerske komore Srbije.

Pregled naučnih i stručnih rezultata u 2015. godini 89

RESEARCH PROJECTS NAUČNI PROJEKTI FINANCED BY THE FINANSIRANI OD STRANE MINISTRY OF EDUCATION, MINISTARSTVA SCIENCE AND PROSVETE, NAUKE TECHNOLOGICAL I TEHNOLOŠKOG DEVELOPMENT RAZVOJA 90 Institut za ispitivanje materijala a.d. Beograd

NAUČNI PROJEKTI FINANSIRANI OD STRANE MINISTARSTVA PROSVETE, NAUKE I TEHNOLOŠKOG RAZVOJA

TEHNOLOŠKI RAZVOJ

Ev. Naziv projekta broj

35002 Razvoj novih metodologija Dr Miodrag Arsić, revitalizacje turbinske i rukovodilac projekta hidromehaničke opreme Dr Vencislav Grabulov hidroelektrana u zavisnosti od uzroka degradacije materijala Dr Zoran Odanović Nebojša Milovanović

36014 Geotehnički aspekti istraživanja Dr Nenad Šušić, i razvoja savremenih rukovodilac projekta tehnologija građenja i sanacija Mr Ksenija Đoković deponija komunalnog otpada Dušan Berisavljević Jelena Ćirilović

36017 Istraživanje mogućnosti Dr Aleksandra Mitrović primene otpadnih i recikliranih Dr Ksenija Janković materijala u betonskim kompozitima, sa ocenom uticaja Mr Dragan Bojović na životnu sredinu, u cilju Ljiljana Lončar promocije održivog građevinarstva u Srbiji Marko Stojanović

35011 Integritet opreme pod pritiskom Dr Dejan Momčilović pri istovremenom delovanju Mr Vujadin Aleksić zamarajućeg opterećenja i temperature Pregled naučnih i stručnih rezultata u 2015. godini 91

35006 Održivost i unapređenje Dr Miodrag Arsić mašinskih sistema u energetici i

transportu primenom forenzičkog inženjerstva, eko i robust dizajna

35029 Razvoj metodologija za Dr Dejan Momčilović povećanje radne sposobnosti,

pouzdanosti i energetske efikasnosti mašinskih sistema u energetici

35040 Razvoj savremenih metoda Željko Flajs dijagnostike i ispitivanja

mašinskih struktura

INTEGRALNA I INTERDISCIPLINARNA ISTRAŽIVANJA

Ev. Naziv projekta broj

45008 Razvoj i primena Dr Zagorka Radojević multifunkcionalnih materijala na Dr Anja Terzić bazi domaćih sirovina modernizacijom tradicionalnih Dr Milica Arsenović tehnologija Dr Miloš Vasić Ljiljana Miličić Ivana Delić

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OSNOVNA ISTRAŽIVANJA

Ev. Naziv projekta broj

186010 Minerali Srbije: sastav, struktura, Dr Snežana Dević geneza, primena i doprinos održanju životne sredine

172005 Uticaj nano i mikrostrukturnih Dr Zoran Odanović konstituenata na sintezu i karakteristike savremenih kompozitnih materijala sa metalnom osnovom

174004 Mikromehanički kriterijumi Dr Vencislav Grabulov oštećenja i loma

172057 Usmerena sinteza, struktura i Dr Anja Terzić svojstva multifunkcionalnih materijala

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AWARDS AND NAGRADE RECOGNITIONS I PRIZNANJA 94 Institut za ispitivanje materijala a.d. Beograd

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SELECTED ODABRANE BUSINESS REFERENCES STRUČNE REFERENCE 98 Institut za ispitivanje materijala a.d. Beograd

U ovom odeljku dat je pregled ključnih usluga koje je Institut IMS izvršio u 2015. 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, mašinske industrije i energetike. Pregled referenci dat je po organizacionim celinama.

Pregled naučnih i stručnih rezultata u 2015. godini 99

THE CENTRE CENTAR FOR MATERIALS ZA MATERIJALE 100 Institut za ispitivanje materijala a.d. Beograd

CENTAR ZA MATERIJALE

Laboratorija za kamen i agregat R.b. Referenca 1. Laboratorijska ispitivanja uzoraka tehničkog i arhitektonskog kamena, šljunka i peska u cilju realizacije geoloških istraživanja ležišta 2. Ispitivanje tehničkog i arhitektonskog kamena, ispitivanje kamenih agregata, atestiranje kamenih agregata, ispitivanje na prisustva azbesta (preko 1.200 analiza za preko 100 različitih naručilaca)

3. Ispitivanje materijala sa kulturno-istorijskih spomenika: - istorijski malter sa sinagoge u Subotici, - istorijski malter sa tvrđave Novo brdo, - istorijski malter sa crkve Svetog Pavla u Kotoru - istorijski malter i kamen sa tvrđave Kastel u Banjaluci - istorijski malter i kamen sa crkve Svete Tereze Avilske u Subotici - istorijski malter i kamen sa crkve Svetog Đorđa na Oplencu - kamen sa skulpture na krovu Zemunske gimnazije

Pregled naučnih i stručnih rezultata u 2015. godini 101

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Laboratorija za građevinsku keramiku R.b. Referenca Investitor 1. Elaborat o oceni kvaliteta opekarske Univerzum-Kubršnica sirovine sa ležišta Vaganac kod Topole Aranđelovac 2. Elaborat o oceni kvaliteta opekarske Univerzum-Kubršnica sirovine sa ležišta Vićija kod Aranđelovca Aranđelovac 3. Elaborat o kvalitetu kiselgura i oceni Carlsberg Srbija d.o.o. mogućnosti njegove primene kao dodatka Čelarevo u proizvodnji opekarskih proizvoda

4. Elaborat o oceni kvaliteta opekarske Fantini Scianatico sirovine sa ležišta Mihailovac d.o.o. Beograd

5. Elaborat o oceni kvaliteta opekarske IGK Polet a.d. sirovine sa ležišta Bereg Novi Bečej

6. Elaborat o oceni kvaliteta opekarske IGK Polet a.d. sirovine sa ležišta Garajevac Novi Bečej

7. Studija o rezultatima dijagnosticiranja IGM Dilj d.o.o. temperaturnog režima rada tunelske peći Vinkovci, Hrvatska posle rekonstrukcije, sa preporukama za optimizaciju procesa pečenja u pogonu 1

8. Studija o rezultatima dijagnosticiranja Status Integral d.o.o. temperaturnog režima rada tunelske peći Kraljevo posle rekonstrukcije, sa preporukama za optimizaciju procesa pečenja u pogonu Vojvoda Prijezda, Stalać

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Laboratorija za beton R.b. Referenca 1. Završne ocene kvaliteta betona za objekte izvedene u Srbiji za firmu Širbegović grupa – GMT Konstrukcije, Gračanica, BiH 2. Kontrola kvaliteta betona na projektu: Most Zemun-Borča, za China Road and Bridge Corporation – Serbia 3. Kontrola kvaliteta ugrađenih materijala tokom izvođenja radova na autoputu E-80, deonica Čiflik – Staničenje, za Construcciones Rubau – Ogranak Niš 4. Pod-konsultant za nadzor građevinskih radova na autoputu E 75 (Grabovnica – Lovosoje), za Louis Berger 5. Kontrola kvaliteta betona na gradilištu: Paralelni put Bela - Palanka Pirot, za Ferbild 6. Tekuća kontrola kvaliteta betona na gradilištu: Autoput E-763, deo 3: Obrenovac – Ub, za China Shandong International Economic & Technical, Ogranak Beograd 7. 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 8. Kontrola kvaliteta na deonica autoputa E-75 Grdelica – Caričina Dolina za AZVI 9. Kontrola kvaliteta na deonica autoputa E-75 Caričina Dolina – tunel Manajle za firmu Ogranak Prijedorputevi B Beograd

Laboratorija za akustiku i vibracije R.b. Referenca Investitor 1. Merenje nivoa komunalne buke na teritoriji Grad Novi Sad grada Novog sada u periodu od juna 2014. Gradska uprava za godine do maja 2015. godine zaštitu životne sredine 104 Institut za ispitivanje materijala a.d. Beograd

Laboratorija za veziva, hemiju i maltere R.b. Referenca Investitor 1. Uspostavljanje fabričke kontrole JP Elektroprivreda proizvodnje ODG gipsa u Srbije, Beograd termoelektranama JP EPS (TENT A, TENT B, TE Kostolac B) 2. Uspostavljanje fabričke prijemne kontrole JP Elektroprivreda sorbenta za ODG malih blokova (ispod 300 Srbije, Beograd MW) u termoelektranama JP EPS (TENT A, TE Kolubara A, TE Morava i TE Kostolac A) 3. Uspostavljanje fabričke prijemne kontrole JP Elektroprivreda sorbenta za ODG vlažnim postupkom u Srbije, Beograd termoelektranama JP EPS (TENT A, TENT B, i TE Kostolac B)

4. Uspostavljanje fabričke kontrole JP Elektroprivreda proizvodnje letećeg pepela u Srbije, Beograd termoelektranama JP EPS (TENT A, TENT B, TE Kolubara, TE Kostolac A i TE Kostolac B)

5. Valorizacija šljake iz TE JP Elektroprivreda Srbije, Beograd

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Laboratorija za toplotnu tehniku i zaštitu od požara R.b. Referenca Investitor 1. Termovizijska snimanja postrojenja u JP Elektroprivreda realnim pogonskim uslovima, u Srbije, Beograd PD Termoelektrane i stacionarnom toplotnom režimu pri kopovi Kostolac različitim nazivnim snagama bloka, radi prikupljanja informacija neophodnih za termotehničku analizu postrojenja. Ispitivanja su izvršena metodom IC- termovizijskog snimanja objekata, sa naknadnom kvantitativnom i/ili kvalitativnom analizom termograma i ocenom temperaturnog stanja površine i toplotnih fenomena objekta. Termovizijsko snimanje recirkulacionih kanala kotla na bloku 1 TE Kostolac B, Drmno 2. Termovizijsko snimanje cevovoda JP Elektroprivreda visokog pritiska na bloku 1 TE Kostolac Srbije, Beograd B, Drmno PD Termoelektrane i kopovi Kostolac 3. Termovizijsko snimanje kotla na bloku 1 JP Elektroprivreda TE Kostolac B, Drmno Srbije, Beograd PD Termoelektrane i kopovi Kostolac 4. Termovizijsko snimanje dimnog kanala JP Elektroprivreda na bloku 1 TE Kostolac B, Drmno Srbije, Beograd PD Termoelektrane i kopovi Kostolac 5. Termovizijsko snimanje kućišta turbine JP Elektroprivreda na bloku 1 TE Kostolac B, Drmno Srbije, Beograd PD Termoelektrane i kopovi Kostolac 106 Institut za ispitivanje materijala a.d. Beograd

6. Termovizijsko snimanje vratanaca kotla JP Elektroprivreda na bloku B1 TE Kostolac B, Drmno Srbije, Beograd PD Termoelektrane i kopovi Kostolac

7. Ispitivanja požarne otpornosti građevinskih elemenata i konstrukcija, negorivosti materijala, toplotna ispitivanja, proračuni iz toplotne zaštite zgrada i stručna mišljenja iz oblasti preventivne zaštite od požara u građevinarstvu (preko 200 ispitivanja, proračuna i stručnih mišljena, za više od 60 naručilaca)

8. Sopstveni razvoj automatizovanog sistema za ispitivanje negorivosti materijala u skladu sa ispitnim standardom EN ISO 1182

9. Razvoj softvera računarskog sistema za merenje, praćenje, nadzor i upravljanje procesom ispitivanja otpornosti prema požaru građevinskih elemenata i konstrukcija

Laboratorija za hidroizolacije i antikorozionu zaštitu (AKZ) R.b. Referenca Investitor 1. Interceptor za BVK Beograd Grad Beograd (hidroizolacija) 2. Stari most preko Tamiša kod Pančeva Direkcija za izgradnju (AKZ) grada Pančeva 3. Đerdap I Kladovo (AKZ) JP EPS

4. Petlja Batajnica (hidroizolacija i AKZ) MBA Miljković

5. Koridor 11 (hidroizolacija) Koridori Srbije

6. Most Zemun – Borča sa pristupnim CRBC, Kina saobraćajnicama (hidroizolacija)

Pregled naučnih i stručnih rezultata u 2015. godini 107

Laboratorija za drvo i sintetičke materijale R.b. Referenca Naručilac ispitivanja 1. Laboratorijska ispitivanja građevinske Roloplast d.o.o. stolarije - prozora, balkonskih vrata i Kovačica segmenata fasada na vodonepropustljivost, Topwood d.o.o. vazdušnu propustljivost i otpornost na Beograd udare ASCI d.o.o., Beograd Tehnomarket d.o.o. Pančevo 2. Laboratorijsko ispitivanje vodovodnih i Peštan d.o.o. kanalizacionih cevi Aranđelovac Poliester a.d. Priboj JP Vodovod, Pirot 3. Laboratorijsko ispitivanje termoizolacionih Austrotherm d.o.o. materijala – ekspandiranih (EPS) i Valjevo i Niš ekstrudiranih (XPS) polistirena i mineralne Masterplast YU d.o.o. vune Subotica Fibrotermica, Grčka VANAS, Grčka JUB d.o.o. Šimanovci 108 Institut za ispitivanje materijala a.d. Beograd

4. Laboratorijska ispitivanja ploča iverica u Špik Ivanjica d.o.o. svrhu sertifikacije J.U.A. Frischeis d.o.o. Nova Pazova Pinoles d.o.o. Beograd, DIPO d.o.o. Beograd, TECASI d.o.o. Kruševac 5. Terensko ispitivanje građevinske stolarije Objekat ACC na objektu-ispitivanje otpornosti na udar Podogorica kiše GTC 41 Novi Beograd

6. Terensko ispitivanje drveta na objektu Termika d.o.o Beograd JP Beograd HE Đerdap 1, Kladovo

Pregled naučnih i stručnih rezultata u 2015. godini 109

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CENTAR ZA METALE I ENERGETIKU

Laboratorija za ispitivanje metala, Kontrolno telo, Laboratorija za etaloniranje mehaničkih veličina R.b. Referenca Investitor

1. Ispitivanje opreme u elektrani tokom JP EPS BEOGRAD četvrte etape revitalizacije – He Đerdap 1 Ogranak HE Đerdap (IBR, IR, tehnologije zavarivanja, prijem HE ĐERDAP 1 opreme u fabrikama u zemlji i inostranstvu, procena preostalog veka)

2. Ispitivanje materijala bez razaranja JP EPS BEOGRAD Ogranak RB Kolubara Kolubara metal

3. Ispitivanja bez razaranja zavarenih spojeva GAT DOO na spravi B-2000 (tračni transporter) koji je Novi Sad montiran na montažnom placu RB Kolubara u Zeokama 4. Ispitivanje glavnih parovodnih linija RA, JP EPS BEOGRAD RB, RC i ispitivanje prestrujnih parovoda Ogranak TE Nikola na blokovima A3, A4, A5 u TENT a Tesla A (IBR, IR, replike) 5. Ispitivanje turbinske opreme na blokovima JP EPS BEOGRAD A1, A3, A4, A5 i A6 (IBR, IR, replike) Ogranak TE Nikola Tesla A 6. Fabrički prijem opreme za HE Đerdap 1 JP EPS BEOGRAD (mehaničko-tehnološke osobine) pri izradi i Ogranak HE Đerdap sanaciji delova hidroagregata u fabrici HE ĐERDAP 1 LMZ, Silovie Mašini, Rusija) Pregled naučnih i stručnih rezultata u 2015. godini 111

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7. Ispitivanja bez razaranja na cevnom sistemu JP EPS BEOGRAD kotla i cevovodima visokog pritiska i Ogranak ekspertiza materijala – TE Kostolac B TE KO Kostolac 8. Ispitivanje hemijskog sastava i mehaničkih China Machinery osobina betonskog čelika Engineering Corporation (CMEC) Beijing, China 9. Ispitivanje betonskog čelika Arcelor Mittal Zenica d.o.o. Zenica 10. Ispitivanje betonskog čelika Metalfer Steel Mill d.o.o. Sremska Mitrovica 11. Ispitivanje mehaničkih osobina vijaka, Markant navrtki i podloški Valjevo 12. Ispitivanja proizvoda od gvožđa i čelika Ogranak Terna S.A. (armatura, užad za prednaprezanje, cevi...) Serbia, Beograd 13. Etaloniranje uređaja za merenje mehaničkih EPS Beograd, Ogranak veličina RB Kolubara Poliester, Priboj La Farge, Beočin Holcim, N.Popovac Krušik, Valjevo Azvirt, Beograd Železara Smederevo JAT Tehnika, Beograd Lasta, Beograd Energoprojekt niskogradnja, Beograd

Pregled naučnih i stručnih rezultata u 2015. godini 113

THE CENTRE CENTAR FOR ROADS ZA PUTEVE AND GEOTECHNICS I GEOTEHNIKU 114 Institut za ispitivanje materijala a.d. Beograd

CENTAR ZA PUTEVE I GEOTEHNIKU

Laboratorija za geotehniku R.b. Referenca Ispitivanje šipova – Statičko probno opterećenje

1. Most preko kanala DTD, Fmax=6.000 kN, Novi Sad

2. Vetropark, Kula

3. Fabrika Tigar u Pirotu

4. Aviv Park, Zrenjanin

5. Naselje Dr Ivana Ribara, Novi Beograd Ispitivanje šipova – DLT metoda

6. Mostovi na koridoru XI, ispitano je više od 15 šipova tokom 2015.

7. Mostovi na autoputu Banja Luka – Doboj, BiH, ispitano je 4 šipa

8. Objekti u sklopu kompleksa Beograd na Vodi, ispitano je 3 šipa

9. Ispitano je više od 10 šipova za industrijska postrojenja i stambeno- poslovne komplekse na teritoriji Republike Srbije Ispitivanje šipova – SIT metoda

10. Objekti na trasi autoputa Banja Luka – Doboj, BiH, ispitano je više od 100 šipova u periodu 2014-2015.

11. Objekti na trasi koridora X i XI u Republici Srbiji, ispitano je više od 300 šipova u periodu 2013-2015.

12. Ispitano je više od 3.000 šipova za objekte različitih namena na teritoriji Republike Srbije

Pregled naučnih i stručnih rezultata u 2015. godini 115

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Projekti sanacije klizišta

13. Sanacija klizišta na državnim putevima I i II reda na teritoriji Republike Srbije u okolini Ljubovije, Svilajnca, Kraljeva, Guče, Valjeva, Kruševca, Uba, Rudnika, Leskovca, Novog Pazara Geotehnički elaborati

14. Geotehnički elaborat za potrebe modernizacije železničke pruge Novi Sad – Subotica – granica sa Mađarskom

15. Studija upotreba letećeg pepela termoelektrana za stabilizaciju tla, samozbijajući i valjani beton (RCC) sa osvrtom na trajnost cementnih maltera i sitnozrnih betona

16. Mostovi na autoputu E 75 LOT 1 Grdelica – Caričina Dolina (za 6 mostova)

Pregled naučnih i stručnih rezultata u 2015. godini 117

THE CENTRE FOR CENTAR ZA STRUCTURES KONSTRUKCIJE AND PRESTRESSING I PREDNAPREZANJE 118 Institut za ispitivanje materijala a.d. Beograd

CENTAR ZA KONSTRUKCIJE I PREDNAPREZANJE Odeljenje za prednaprezanje R.b. Referenca Investitor 1. Primena sistema prednaprezanja SPB i SPB Ogranak Integral SUPER i radovi na prednaprezanju Inženjering Beograd konstrukcija mostova: Kučajska dolina, Južna Morava 1, Južna Morava 2 i Koznička reka, na

autoputu E-75, deonica Caričina dolina –

Vladičin Han, lot 5, poddeonica Caričina dolina – Tunel Manajle 2. Prednaprezanje geotehničkih sidara na MaksPro d.o.o. Zemun potpornom zidu L4, na autoputu E-75, deonica Caričina dolina – Vladičin Han, lot 5, poddeonica Caričina dolina – Tunel Manajle 3. Primena sistema prednaprezanja SPB i SPB Asa Ibelik d.o.o. SUPER i radovi na prednaprezanju Beograd konstrukcije Mosta preko Podvrške reke na državnom putu IB reda kod Milutinovca, na deonici Kladovo – Brza Palanka 4. Primena sistema prednaprezanja SPB i SPB Ingrap-Omni d.o.o. SUPER i radovi na prednaprezanju Beograd konstrukcije Mosta preko reke Obnice za naselje Velinovići u Valjevu 5. Primena sistema prednaprezanja SPB i SPB GP Nikolić d.o.o. SUPER i radovi na prednaprezanju Kraljevo konstrukcije Mosta preko Jovanovačke reke u naselju Veliki Bračin kod Ražnja 6. Specijalistički stručni nadzor rada pogona za Martini Gradnja d.o.o. adheziono prednaprezanje elemenata Inđija

Pregled naučnih i stručnih rezultata u 2015. godini 119

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Odeljenje za sanacije, projektovanje i nadzor R.b. Referenca Investitor 1. Glavni projekat rekonstrukcije objekata JP Čistoća i zelenilo, centra za selekciju otpada u Subotici Subotica 2. Glavni projekat sanacije čeličnog mosta JP Direkcija za preko reke Ibar u Kraljevu na putu M-5 izgradnju grada Kraljeva

3. Glavni projekat konstrukcije stambeno- Gradnja, Osjek poslovnog objekta u Osijeku

4. Idejni projekat rekonstrukcije mosta “Češka Opština Sombor ćuprija” na kanalu Bezdan – Vrbas na prostoru KO Bački Monoštor

5. Procena uticaja izvođenja otvora za Glečer, Beograd montažu procesne opreme na stabilnost dimnjaka TO Cerak u Beogradu

6. Projekat za građevinsku dozvolu mosta JP Direkcija za “Čuđak” preko lopatnice i mosta preko izgradnju grada Musine reke Kraljeva

7. Tehnički pregled rezervoara u objektu SkPg JP Transnafta Fruska Gora

8. Tehnički izveštaj o izvršenom vizuelnom JP Putevi Srbije pregledu dva propusta na km 613+798,656, 612+327,434 Auto-puta E-75

9. Tehnički pregled i Elaborat o kvalitetu Veletržnica – Beograd izvedenih radova i stepenu izgrađenosti d.o.o. objekta Veletržnice u Beogradu

10. Stručni nadzor nad radovima rušenja Telekom Srbija objekta magacina oštećenog u požaru Pregled naučnih i stručnih rezultata u 2015. godini 121

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11. Stručni nadzor nad radovima BIA rekonstrukcije, sanacije i adaptacije objekta OPN 75/18 – balistički tunel

12. Tehnička kontrola projekata za objekte na JP Direkcija za teritoriji Opštine Lajkovac uređenje i izgradnju Opštine Lajkovac

Laboratorija za ispitivanje konstrukcija R.b. Referenca Investitor

1. Ispitivanje probnim opterećenjem na 22 konstrukcije mostova u Republici Srbiji

2. Ispitivanje stenskih ankera probnim Euro Alliance Tunnels opterećenjem – Koridor X, autoput E-75, JSC deonica : Niš – granica sa Republikom Makedonijom, tuneli „Predejane“ i „Manajle“

3. Ispitivanje stenskih ankera probnim TRACE GROUP opterećenjem – Koridor X, autoput E-80, HOLD PLC deonica : obilaznica oko Dimitrovgrada

4. Istražni radovi na objektu DO1 i DO2, JP Elektroprivreda TENT A, Obrenovac Srbije

5. Ispitivanje rotornog bagera srednjeg JP Elektroprivreda kapaciteta „AMECO“ u TENT A Srbije

Pregled naučnih i stručnih rezultata u 2015. godini 123

CERTIFICATION BODY SERTIFIKACIONO TELO 124 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 ad 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. Saradnja sa češkim institutom TZUS, Prag nastavljena je i u 2015. godini kroz zajedničko sprovođenje sertifikacije proizvoda prema harmonizovanim evropskim standardima, kao i kroz održavanje obuka u cilju pripreme osoblja Instituta IMS za predstojeće izmene regulative.

R.b. Referenca Investitor 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. FIBRAN S.A., Thessaloniki, Greece 5. SIKA d.o.o., Beograd, Srbija 6. LAFARGE BFC d.o.o., Beočin, Srbija

Pregled naučnih i stručnih rezultata u 2015. godini 125

CONTROL BODY KONTROLNO TELO 126 Institut za ispitivanje materijala a.d. Beograd

KONTROLNO TELO INSTITUTA IMS

Krajem 2014. Kontrolno telo je dobilo sertifikat o akreditaciji ATS br. 06-170. Akreditacija obuhvata oblasti kontrolisanja koje se sprovode u Centru za metale i energetiku: 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). Prva nadzorna poseta ATS-a je realizovana u julu 2015. Proveravački tim ATS nije konstatovao ni jednu neusaglašenost. U toku 2015. Kontrolno telo, tj. Centar za metale i energetiku, je uspešno realizovao značajan broj kontrolisanja u TE Kostolac B – Drmno, kao i u Rusiji i Češkoj na prijemu opreme za He Đerdap 1, Kladovo. U junu 2015. Centar za metale i energetiku je u saradnji sa Kontrolnim telom dobio Ugovor za prijem opreme za HE Đerdap 1 u Ruskoj Federaciji. Pripremljena je dokumentacija i u oktobru 2015. god. podnet zahtev za imenovanje za novu opremu pod pritiskom i nerastavljive spojeve prema „Pravilniku o tehničkim zahtevima za projektovanje, izradu i ocenjivanje usaglašenosti opreme pod pritiskom“ („Sl.glasnik RS“ br. 87/11). kod Ministarstva za rudarstvo i energetiku.

Pregled naučnih i stručnih rezultata u 2015. godini 127

PT PROVIDER PT PROVAJDER 128 Institut za ispitivanje materijala a.d. Beograd

PIMS - PROVAJDER ZA ISPITIVANJE OSPOSOBLJENOSTI INSTITUT IMS Institut IMS, kao provajder za ispitivanje osposobljenosti primenom međulaboratorijskih poređenja, svoje aktivnosti realizuje posredstvom fleksibilne organizacione celine PIMS i ispitnih laboratorija akreditovanih kod nacionalnog akreditacionog tela.

R.b. Referenca Učesnici 1. Program ispitivanja osposobljenosti PIO Institut za javno BUK/a broj 01/15: Nivo buke u životnoj zdravlje Kragujevac sredini (buka drumskog saobraćaja) prema Zavod za javno (SRPS) ISO 1996-2 zdravlje Istarske županije, Pula, Hrvatska Zavod za istraživanje i sigurnost, Zagreb, Hrvatska ING Atest, Split, Hrvatska Zavod za unapređivanje sigurnosti, Osijek, Hrvatska Institut IMS, Centralna laboratorija za ispitivanje materijala Rudarski institut, Beograd Pregled naučnih i stručnih rezultata u 2015. godini 129

2. Program ispitivanja osposobljenosti PIO Institut za CEM/fhm broj 01/15: Fizička, hemijska i građevinarstvo, mehanička svojstva cementa (CEM I građevinske materijale 42,5R) prema (SRPS) EN 196-1, (SRPS) i nemetale, Tuzla, EN 196-2, t. 4 i 5, (SRPS) EN 196-3 i Bosna i Hercegovina (SRPS) EN 196-6, t. 3 i 4 GP Mostogradnja, Beograd Institut za puteve, Beograd Cemex Hrvatska, Kaštel Sućurac, Hrvatska Institut IMS, Centralna laboratorija za ispitivanje materijala Našicecement, Našice, Hrvatska Gradežen Institut Makedonija, Skopje, Makedonija Holcim (Srbija), Paraćin Centralna putna laboratorija, Veternik Titan cementara Kosijerić, Kosjerić 130 Institut za ispitivanje materijala a.d. Beograd

3. Program ispitivanja osposobljenosti PIO ICECON, Bucharest, KER/fm broj 01/15: Fizička i mehanička Romania svojstva keramičkih pločica (33 cm x 33 Keramika Kanjiža cm) prema (SRPS) EN ISO 10545-3 i Institut IMS, Centralna (SRPS) EN ISO 10545-4 laboratorija za ispitivanje materijala Zorka-keramika, Šabac Labkonsult Plus, Sofia, Bulgaria