TY  - CONF
AU  - Vidak Vasić, Milica
AU  - Radovanović, Lidija
AU  - Radojević, Zagorka
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7357
AB  - The study makes a unique effort to characterize all the necessary characteristics of refractory clays and products fired at
temperatures between 1100 and 1300 °C on a laboratory level. For 19 composite samples from the recently opened
reservoir, thorough instrumental and ceramic-technological data are presented. The potential for using Serbian raw
refractory clays from the recently discovered deposit is investigated. The composites had a variety of qualities and varied
in composition, but they were majorly composed of kaolinite and illite and had a significant share of fluxes. The samples
had high quantities of clay minerals and organic matter, which is seen as the most intense mass loss in the 400–600 °C
range. Low-duty and high-duty refractories could be distinguished by their refractoriness over 1581 °C. This parameter
was mostly influenced by the content of alumina and kaolinite within the materials. Hydraulically-pressed ceramic tiles,
following the firing stage, showed water absorption was between 9.02–1.42 % and a modulus of rupture of 16.5 – 53.6
MPa. Color is determined by spectrophotometer and correlated to the composition of the initial clay and fired products.
For the lining of ceramic and glass furnaces, the majority of these clays can be used as natural refractory materials. Some
of the samples' organic content has a detrimental effect on the fast-firing procedure, since the occurrence of the entrapped
air (bloating).
PB  - Belgrade : Association of Metallurgical Engineers of Serbia (AMES)
C3  - Congress Proceedings / 5th Metallurgical & Materials Engineering Congress of South-East Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023
T1  - Raw kaolinitic-illitic clays for the production of refractory ceramics
EP  - 22
SP  - 17
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7357
ER  - 

@conference{
author = "Vidak Vasić, Milica and Radovanović, Lidija and Radojević, Zagorka",
year = "2023",
abstract = "The study makes a unique effort to characterize all the necessary characteristics of refractory clays and products fired at
temperatures between 1100 and 1300 °C on a laboratory level. For 19 composite samples from the recently opened
reservoir, thorough instrumental and ceramic-technological data are presented. The potential for using Serbian raw
refractory clays from the recently discovered deposit is investigated. The composites had a variety of qualities and varied
in composition, but they were majorly composed of kaolinite and illite and had a significant share of fluxes. The samples
had high quantities of clay minerals and organic matter, which is seen as the most intense mass loss in the 400–600 °C
range. Low-duty and high-duty refractories could be distinguished by their refractoriness over 1581 °C. This parameter
was mostly influenced by the content of alumina and kaolinite within the materials. Hydraulically-pressed ceramic tiles,
following the firing stage, showed water absorption was between 9.02–1.42 % and a modulus of rupture of 16.5 – 53.6
MPa. Color is determined by spectrophotometer and correlated to the composition of the initial clay and fired products.
For the lining of ceramic and glass furnaces, the majority of these clays can be used as natural refractory materials. Some
of the samples' organic content has a detrimental effect on the fast-firing procedure, since the occurrence of the entrapped
air (bloating).",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia (AMES)",
journal = "Congress Proceedings / 5th Metallurgical & Materials Engineering Congress of South-East Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023",
title = "Raw kaolinitic-illitic clays for the production of refractory ceramics",
pages = "22-17",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7357"
}

Vidak Vasić, M., Radovanović, L.,& Radojević, Z.. (2023). Raw kaolinitic-illitic clays for the production of refractory ceramics. in Congress Proceedings / 5th Metallurgical & Materials Engineering Congress of South-East Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023
Belgrade : Association of Metallurgical Engineers of Serbia (AMES)., 17-22.
https://hdl.handle.net/21.15107/rcub_technorep_7357

Vidak Vasić M, Radovanović L, Radojević Z. Raw kaolinitic-illitic clays for the production of refractory ceramics. in Congress Proceedings / 5th Metallurgical & Materials Engineering Congress of South-East Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023. 2023;:17-22.
https://hdl.handle.net/21.15107/rcub_technorep_7357 .

Vidak Vasić, Milica, Radovanović, Lidija, Radojević, Zagorka, "Raw kaolinitic-illitic clays for the production of refractory ceramics" in Congress Proceedings / 5th Metallurgical & Materials Engineering Congress of South-East Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023 (2023):17-22,
https://hdl.handle.net/21.15107/rcub_technorep_7357 .

TY  - JOUR
AU  - Mijatović, Nevenka
AU  - Vasić, Milica
AU  - Miličić, Ljiljana
AU  - Radomirović, Milena
AU  - Radojević, Zagorka
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5193
AB  - In this paper, the main subject concerns comparing different techniques to prepare raw clay samples for energy-dispersive X-ray fluorescence spectrometry (EDXRF). Three kinds of sample preparation procedures are examined, such as loose powder, pressed pellet, and fired pressed pellet. The fired pressed pellet approach was observed as a part of universal sample preparation for physic, mechanical, and instrumental analysis, which has not been previously tested as a solution in chemical analysis by the EDXRF method. The observed sample preparation techniques were compared by calculating the parameters of validation (recoveries, limit of detection - LOD, limit of quantification - LOQ, precision, and expanded uncertainties of measurements) of 11 elements (Si, Al, Fe, Ca, Mg, K, Na, Ti, P, Mn, and S) using 15 certified reference materials (CRMs). Calibration curves were created and evaluated using 30 reference materials (RM) for all three approaches. Results proved that the fired pressed pellet is the most practical and precise approach for sample preparation of raw clays.
PB  - Elsevier B.V.
T2  - Talanta
T1  - Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays
SP  - 123844
VL  - 252
DO  - 10.1016/j.talanta.2022.123844
ER  - 

@article{
author = "Mijatović, Nevenka and Vasić, Milica and Miličić, Ljiljana and Radomirović, Milena and Radojević, Zagorka",
year = "2023",
abstract = "In this paper, the main subject concerns comparing different techniques to prepare raw clay samples for energy-dispersive X-ray fluorescence spectrometry (EDXRF). Three kinds of sample preparation procedures are examined, such as loose powder, pressed pellet, and fired pressed pellet. The fired pressed pellet approach was observed as a part of universal sample preparation for physic, mechanical, and instrumental analysis, which has not been previously tested as a solution in chemical analysis by the EDXRF method. The observed sample preparation techniques were compared by calculating the parameters of validation (recoveries, limit of detection - LOD, limit of quantification - LOQ, precision, and expanded uncertainties of measurements) of 11 elements (Si, Al, Fe, Ca, Mg, K, Na, Ti, P, Mn, and S) using 15 certified reference materials (CRMs). Calibration curves were created and evaluated using 30 reference materials (RM) for all three approaches. Results proved that the fired pressed pellet is the most practical and precise approach for sample preparation of raw clays.",
publisher = "Elsevier B.V.",
journal = "Talanta",
title = "Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays",
pages = "123844",
volume = "252",
doi = "10.1016/j.talanta.2022.123844"
}

Mijatović, N., Vasić, M., Miličić, L., Radomirović, M.,& Radojević, Z.. (2023). Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays. in Talanta
Elsevier B.V.., 252, 123844.
https://doi.org/10.1016/j.talanta.2022.123844

Mijatović N, Vasić M, Miličić L, Radomirović M, Radojević Z. Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays. in Talanta. 2023;252:123844.
doi:10.1016/j.talanta.2022.123844 .

Mijatović, Nevenka, Vasić, Milica, Miličić, Ljiljana, Radomirović, Milena, Radojević, Zagorka, "Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays" in Talanta, 252 (2023):123844,
https://doi.org/10.1016/j.talanta.2022.123844 . .

TY  - JOUR
AU  - Vidak Vasić, Milica
AU  - Terzić, Anja
AU  - Radovanović, Željko
AU  - Radojević, Zagorka
AU  - Warr, Laurence N.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5301
AB  - Geopolymerization was investigated as an alternative to traditional ceramic products by developing a more sustainable approach that avoids thermal treatment. The study presents the first known alkali-activation of the raw clay and waste clay brick mixture using the solid to liquid ratios of 2.33 and 2.78. Several experimental sets were prepared to harden under varying conditions (2–4 days drying in 60 °C–70 °C and 3 h steam-curing). Non-activated and activated samples were analyzed for their physical and chemical properties after 14, 21, and 28 days. The tile-shaped specimens exhibited better initial drying behavior than the cubes and produced stronger materials with fewer cracks. Pre-curing in steam conditions induced higher flexural strength (13.7 MPa) and water absorption (13.13%) for the geopolymer tiles. The highest Si/Al molar ratio in the amorphous portion of 5.78 induced the best flexural strength. The geopolymerization process showed microstructural changes associated with the appearance of fibrous Na-zeolite nanocrystals. The degree of geopolymerization and zeolite formation was enhanced by steam-curing, but the microstructural stress and heterogeneity induced by the reactions resulted in higher water absorption. Ongoing reactions of amorphization in the bulk material and further crystallization at the surface are documented after 6 months of curing. This first detailed study reveals that the production of geopolymer ceramics from brick waste is possible, but further optimization of the activating solution and curing parameters is required.
PB  - Elsevier Ltd.
T2  - Applied Clay Science
T1  - Alkali-activated geopolymerization of a low illitic raw clay and waste brick mixture. An alternative to traditional ceramics
SP  - 106410
VL  - 218
DO  - 10.1016/j.clay.2022.106410
ER  - 

@article{
author = "Vidak Vasić, Milica and Terzić, Anja and Radovanović, Željko and Radojević, Zagorka and Warr, Laurence N.",
year = "2022",
abstract = "Geopolymerization was investigated as an alternative to traditional ceramic products by developing a more sustainable approach that avoids thermal treatment. The study presents the first known alkali-activation of the raw clay and waste clay brick mixture using the solid to liquid ratios of 2.33 and 2.78. Several experimental sets were prepared to harden under varying conditions (2–4 days drying in 60 °C–70 °C and 3 h steam-curing). Non-activated and activated samples were analyzed for their physical and chemical properties after 14, 21, and 28 days. The tile-shaped specimens exhibited better initial drying behavior than the cubes and produced stronger materials with fewer cracks. Pre-curing in steam conditions induced higher flexural strength (13.7 MPa) and water absorption (13.13%) for the geopolymer tiles. The highest Si/Al molar ratio in the amorphous portion of 5.78 induced the best flexural strength. The geopolymerization process showed microstructural changes associated with the appearance of fibrous Na-zeolite nanocrystals. The degree of geopolymerization and zeolite formation was enhanced by steam-curing, but the microstructural stress and heterogeneity induced by the reactions resulted in higher water absorption. Ongoing reactions of amorphization in the bulk material and further crystallization at the surface are documented after 6 months of curing. This first detailed study reveals that the production of geopolymer ceramics from brick waste is possible, but further optimization of the activating solution and curing parameters is required.",
publisher = "Elsevier Ltd.",
journal = "Applied Clay Science",
title = "Alkali-activated geopolymerization of a low illitic raw clay and waste brick mixture. An alternative to traditional ceramics",
pages = "106410",
volume = "218",
doi = "10.1016/j.clay.2022.106410"
}

Vidak Vasić, M., Terzić, A., Radovanović, Ž., Radojević, Z.,& Warr, L. N.. (2022). Alkali-activated geopolymerization of a low illitic raw clay and waste brick mixture. An alternative to traditional ceramics. in Applied Clay Science
Elsevier Ltd.., 218, 106410.
https://doi.org/10.1016/j.clay.2022.106410

Vidak Vasić M, Terzić A, Radovanović Ž, Radojević Z, Warr LN. Alkali-activated geopolymerization of a low illitic raw clay and waste brick mixture. An alternative to traditional ceramics. in Applied Clay Science. 2022;218:106410.
doi:10.1016/j.clay.2022.106410 .

Vidak Vasić, Milica, Terzić, Anja, Radovanović, Željko, Radojević, Zagorka, Warr, Laurence N., "Alkali-activated geopolymerization of a low illitic raw clay and waste brick mixture. An alternative to traditional ceramics" in Applied Clay Science, 218 (2022):106410,
https://doi.org/10.1016/j.clay.2022.106410 . .

TY  - JOUR
AU  - Vidak Vasić, Milica
AU  - Radovanović, Lidija
AU  - Pezo, Lato
AU  - Radojević, Zagorka
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5291
AB  - The usage possibility of 19 composites of raw refractory clays from Serbia containing approximately 53.29% of SiO2 and 26.73% of Al2O3 is presented. The sum of fluxing oxides was 57.74%, while these materials contained 32% of quartz, 29% of kaolinite and 26% of illite–mica. Dilatometry tests revealed a sudden shrinkage with the peak at approximately 1115 °C, owing to the formation of mullite. The refractoriness was in the range of 1581–1718 °C, which classifies the composites from low- to high-duty refractories. Based on correlation analysis, the refractoriness mostly depended on the content of alumina. The lightness of the fired test pieces was lower after firing when compared to the dry samples, and it decreased with the firing temperature from reddish to grayish. The study presents a novel attempt to define all the necessary properties of raw refractory clays and products fired at the 1100–1300 °C range on a laboratory level. Most of these clays can be used as natural refractory materials for ceramic and glass furnace lining. The organic matter in some of the samples influences negatively the fast-firing process.
PB  - Springer Science and Business Media B.V.
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories
EP  - 1803
IS  - 5
SP  - 1783
VL  - 148
DO  - 10.1007/s10973-022-11848-w
ER  - 

@article{
author = "Vidak Vasić, Milica and Radovanović, Lidija and Pezo, Lato and Radojević, Zagorka",
year = "2022",
abstract = "The usage possibility of 19 composites of raw refractory clays from Serbia containing approximately 53.29% of SiO2 and 26.73% of Al2O3 is presented. The sum of fluxing oxides was 57.74%, while these materials contained 32% of quartz, 29% of kaolinite and 26% of illite–mica. Dilatometry tests revealed a sudden shrinkage with the peak at approximately 1115 °C, owing to the formation of mullite. The refractoriness was in the range of 1581–1718 °C, which classifies the composites from low- to high-duty refractories. Based on correlation analysis, the refractoriness mostly depended on the content of alumina. The lightness of the fired test pieces was lower after firing when compared to the dry samples, and it decreased with the firing temperature from reddish to grayish. The study presents a novel attempt to define all the necessary properties of raw refractory clays and products fired at the 1100–1300 °C range on a laboratory level. Most of these clays can be used as natural refractory materials for ceramic and glass furnace lining. The organic matter in some of the samples influences negatively the fast-firing process.",
publisher = "Springer Science and Business Media B.V.",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories",
pages = "1803-1783",
number = "5",
volume = "148",
doi = "10.1007/s10973-022-11848-w"
}

Vidak Vasić, M., Radovanović, L., Pezo, L.,& Radojević, Z.. (2022). Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories. in Journal of Thermal Analysis and Calorimetry
Springer Science and Business Media B.V.., 148(5), 1783-1803.
https://doi.org/10.1007/s10973-022-11848-w

Vidak Vasić M, Radovanović L, Pezo L, Radojević Z. Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories. in Journal of Thermal Analysis and Calorimetry. 2022;148(5):1783-1803.
doi:10.1007/s10973-022-11848-w .

Vidak Vasić, Milica, Radovanović, Lidija, Pezo, Lato, Radojević, Zagorka, "Raw kaolinitic–illitic clays as high-mechanical-performance hydraulically pressed refractories" in Journal of Thermal Analysis and Calorimetry, 148, no. 5 (2022):1783-1803,
https://doi.org/10.1007/s10973-022-11848-w . .

TY  - JOUR
AU  - Vasić, Milica V.
AU  - Pezo, Lato L.
AU  - Zdravković, Jelena D.
AU  - Vrebalov, Marija
AU  - Radojević, Zagorka
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5091
AB  - This research describes a study of 11 selected samples of brick clays applied in roofing tile production, by using simultaneous thermal analysis. Additionally, the laboratory-sized samples were prepared and fired (850-950 °C) and technological properties were determined. Mathematical analysis was applied to sum all the experimental results and help discriminate the samples by their behavior during firing. The samples, very similar according to mineralogical and chemical content, as well as granulometry tests, were successfully grouped using principal component analysis (PCA). The PCA was used to explore and easily visualize the differences between samples. The PCA performed for differential thermal analysis (DTA), differential scanning calorimetry (DSC) and differential thermogravimetry (DTG) curves clearly showed that the heat flow was mainly influenced by carbonate content and its grain size, while DTG discriminated samples according to the contents of clay minerals and carbonates. In addition, dilatometry analysis revealed which samples underwent the highest densification during the firing process. The PCA analysis of fired products properties showed that the highest correlations were between water absorption with firing shrinkage and compressive strength.
PB  - International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Thermal, Ceramic and Technological Properties of Clays used in Production of Roofing Tiles – Principal Component Analysis
EP  - 500
IS  - 4
SP  - 487
VL  - 50
DO  - 10.2298/SOS1804487V
ER  - 

@article{
author = "Vasić, Milica V. and Pezo, Lato L. and Zdravković, Jelena D. and Vrebalov, Marija and Radojević, Zagorka",
year = "2018",
abstract = "This research describes a study of 11 selected samples of brick clays applied in roofing tile production, by using simultaneous thermal analysis. Additionally, the laboratory-sized samples were prepared and fired (850-950 °C) and technological properties were determined. Mathematical analysis was applied to sum all the experimental results and help discriminate the samples by their behavior during firing. The samples, very similar according to mineralogical and chemical content, as well as granulometry tests, were successfully grouped using principal component analysis (PCA). The PCA was used to explore and easily visualize the differences between samples. The PCA performed for differential thermal analysis (DTA), differential scanning calorimetry (DSC) and differential thermogravimetry (DTG) curves clearly showed that the heat flow was mainly influenced by carbonate content and its grain size, while DTG discriminated samples according to the contents of clay minerals and carbonates. In addition, dilatometry analysis revealed which samples underwent the highest densification during the firing process. The PCA analysis of fired products properties showed that the highest correlations were between water absorption with firing shrinkage and compressive strength.",
publisher = "International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Thermal, Ceramic and Technological Properties of Clays used in Production of Roofing Tiles – Principal Component Analysis",
pages = "500-487",
number = "4",
volume = "50",
doi = "10.2298/SOS1804487V"
}

Vasić, M. V., Pezo, L. L., Zdravković, J. D., Vrebalov, M.,& Radojević, Z.. (2018). Thermal, Ceramic and Technological Properties of Clays used in Production of Roofing Tiles – Principal Component Analysis. in Science of Sintering
International Institute for the Science of Sintering., 50(4), 487-500.
https://doi.org/10.2298/SOS1804487V

Vasić MV, Pezo LL, Zdravković JD, Vrebalov M, Radojević Z. Thermal, Ceramic and Technological Properties of Clays used in Production of Roofing Tiles – Principal Component Analysis. in Science of Sintering. 2018;50(4):487-500.
doi:10.2298/SOS1804487V .

Vasić, Milica V., Pezo, Lato L., Zdravković, Jelena D., Vrebalov, Marija, Radojević, Zagorka, "Thermal, Ceramic and Technological Properties of Clays used in Production of Roofing Tiles – Principal Component Analysis" in Science of Sintering, 50, no. 4 (2018):487-500,
https://doi.org/10.2298/SOS1804487V . .

TY  - JOUR
AU  - Vasić, Milica
AU  - Pezo, Lato
AU  - Zdravković, Jelena
AU  - Backalić, Z.
AU  - Radojević, Zagorka
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5857
AB  - The aim of this study was to test montmorillonite and hydromica type of brick clays by using simultaneous thermal analysis and dilatometry in an assessment of the suitability of brick clays to produce building elements. The plasticity coefficient and drying susceptibility were determined to discover the behavior of brick clays. Fired products' characteristics were studied by performing water absorption and compressive strength tests. All the methods were employed in the construction of the firing curves in a tunnel kiln. The results could increase the degree of certainty to lead the production process towards obtaining the desired features of brick elements.
PB  - Elsevier Sci Ltd, Oxford
T2  - Construction and Building Materials
T1  - The study of thermal behavior of montmorillonite and hydromica brick clays in predicting tunnel kiln firing curve
EP  - 879
SP  - 872
VL  - 150
DO  - 10.1016/j.conbuildmat.2017.06.068
ER  - 

@article{
author = "Vasić, Milica and Pezo, Lato and Zdravković, Jelena and Backalić, Z. and Radojević, Zagorka",
year = "2017",
abstract = "The aim of this study was to test montmorillonite and hydromica type of brick clays by using simultaneous thermal analysis and dilatometry in an assessment of the suitability of brick clays to produce building elements. The plasticity coefficient and drying susceptibility were determined to discover the behavior of brick clays. Fired products' characteristics were studied by performing water absorption and compressive strength tests. All the methods were employed in the construction of the firing curves in a tunnel kiln. The results could increase the degree of certainty to lead the production process towards obtaining the desired features of brick elements.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Construction and Building Materials",
title = "The study of thermal behavior of montmorillonite and hydromica brick clays in predicting tunnel kiln firing curve",
pages = "879-872",
volume = "150",
doi = "10.1016/j.conbuildmat.2017.06.068"
}

Vasić, M., Pezo, L., Zdravković, J., Backalić, Z.,& Radojević, Z.. (2017). The study of thermal behavior of montmorillonite and hydromica brick clays in predicting tunnel kiln firing curve. in Construction and Building Materials
Elsevier Sci Ltd, Oxford., 150, 872-879.
https://doi.org/10.1016/j.conbuildmat.2017.06.068

Vasić M, Pezo L, Zdravković J, Backalić Z, Radojević Z. The study of thermal behavior of montmorillonite and hydromica brick clays in predicting tunnel kiln firing curve. in Construction and Building Materials. 2017;150:872-879.
doi:10.1016/j.conbuildmat.2017.06.068 .

Vasić, Milica, Pezo, Lato, Zdravković, Jelena, Backalić, Z., Radojević, Zagorka, "The study of thermal behavior of montmorillonite and hydromica brick clays in predicting tunnel kiln firing curve" in Construction and Building Materials, 150 (2017):872-879,
https://doi.org/10.1016/j.conbuildmat.2017.06.068 . .

TY  - JOUR
AU  - Arsenović, Milica
AU  - Pezo, Lato
AU  - Stanković, Slavka
AU  - Radojević, Zagorka
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5756
AB  - 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 (r(2)). 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 (r(2)) 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 (chi(2)), mean bias error (MBE), mean percent error (MPE) and root mean square error (RMSE).
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - Factor space differentiation of brick clays according to mineral content: Prediction of final brick product quality
EP  - 114
SP  - 108
VL  - 115
DO  - 10.1016/j.clay.2015.07.030
ER  - 

@article{
author = "Arsenović, Milica and Pezo, Lato and Stanković, Slavka and Radojević, Zagorka",
year = "2015",
abstract = "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 (r(2)). 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 (r(2)) 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 (chi(2)), mean bias error (MBE), mean percent error (MPE) and root mean square error (RMSE).",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "Factor space differentiation of brick clays according to mineral content: Prediction of final brick product quality",
pages = "114-108",
volume = "115",
doi = "10.1016/j.clay.2015.07.030"
}

Arsenović, M., Pezo, L., Stanković, S.,& Radojević, Z.. (2015). Factor space differentiation of brick clays according to mineral content: Prediction of final brick product quality. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 115, 108-114.
https://doi.org/10.1016/j.clay.2015.07.030

Arsenović M, Pezo L, Stanković S, Radojević Z. Factor space differentiation of brick clays according to mineral content: Prediction of final brick product quality. in Applied Clay Science. 2015;115:108-114.
doi:10.1016/j.clay.2015.07.030 .

Arsenović, Milica, Pezo, Lato, Stanković, Slavka, Radojević, Zagorka, "Factor space differentiation of brick clays according to mineral content: Prediction of final brick product quality" in Applied Clay Science, 115 (2015):108-114,
https://doi.org/10.1016/j.clay.2015.07.030 . .

TY  - JOUR
AU  - Arsenović, Milica
AU  - Stanković, Slavka
AU  - Radojević, Zagorka
AU  - Pezo, Lato
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5800
AB  - Factors influencing final clay brick properties are numerous, since the raw materials are highly heterogeneous. The chemometric approach is rarely used in analysis in this field, although it could significantly improve understanding of the overall system behavior and the quality of products. Principal component analysis (PCA) was used on a group of 139 samples collected in Serbia to discriminate groups of samples according to similarity of chemical composition and fired laboratory products properties. The focus of this study was to determine the importance of parameters that describe clay brick production and quality, depending on final usage of raw material in the clay brick industry. A fuzzy synthetic evaluation, using a membership trapezoidal function with defined optimal interval values for different types of heavy clay products, is chosen for the study. The optimal sample's chemical composition and firing temperature were chosen by the fuzzy synthetic evaluation, regarding the kind of the heavy clay product.
PB  - Expert Fachmedien GmbH
T2  - InterCeram: International Ceramic Review
T1  - The effects of chemical composition and firing temperature in heavy clay brick production - Chemometric approach
EP  - 29
IS  - 1-2
SP  - 26
VL  - 63
DO  - 10.1007/bf03401031
ER  - 

@article{
author = "Arsenović, Milica and Stanković, Slavka and Radojević, Zagorka and Pezo, Lato",
year = "2014",
abstract = "Factors influencing final clay brick properties are numerous, since the raw materials are highly heterogeneous. The chemometric approach is rarely used in analysis in this field, although it could significantly improve understanding of the overall system behavior and the quality of products. Principal component analysis (PCA) was used on a group of 139 samples collected in Serbia to discriminate groups of samples according to similarity of chemical composition and fired laboratory products properties. The focus of this study was to determine the importance of parameters that describe clay brick production and quality, depending on final usage of raw material in the clay brick industry. A fuzzy synthetic evaluation, using a membership trapezoidal function with defined optimal interval values for different types of heavy clay products, is chosen for the study. The optimal sample's chemical composition and firing temperature were chosen by the fuzzy synthetic evaluation, regarding the kind of the heavy clay product.",
publisher = "Expert Fachmedien GmbH",
journal = "InterCeram: International Ceramic Review",
title = "The effects of chemical composition and firing temperature in heavy clay brick production - Chemometric approach",
pages = "29-26",
number = "1-2",
volume = "63",
doi = "10.1007/bf03401031"
}

Arsenović, M., Stanković, S., Radojević, Z.,& Pezo, L.. (2014). The effects of chemical composition and firing temperature in heavy clay brick production - Chemometric approach. in InterCeram: International Ceramic Review
Expert Fachmedien GmbH., 63(1-2), 26-29.
https://doi.org/10.1007/bf03401031

Arsenović M, Stanković S, Radojević Z, Pezo L. The effects of chemical composition and firing temperature in heavy clay brick production - Chemometric approach. in InterCeram: International Ceramic Review. 2014;63(1-2):26-29.
doi:10.1007/bf03401031 .

Arsenović, Milica, Stanković, Slavka, Radojević, Zagorka, Pezo, Lato, "The effects of chemical composition and firing temperature in heavy clay brick production - Chemometric approach" in InterCeram: International Ceramic Review, 63, no. 1-2 (2014):26-29,
https://doi.org/10.1007/bf03401031 . .

TY  - JOUR
AU  - Vasić, Miloš
AU  - Grbavčić, Željko
AU  - Radojević, Zagorka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5769
AB  - Drying plays an important role in the production of clay tiles. In the present article, drying process is analyzed taking experimental data for several masonry clays obtained from different clay tile manufacturers and published data for different clay slabs. Calculation methods and computer programs designed for the calculation of the effective diffusion coefficient are developed. The first calculation method represents the analytical solution of the Crank equation, while the second one represents the analytical solution of the Efremov equation with boundary conditions in the form of the flux. Unlike other materials, clay tiles exhibit shrinkage during the drying process. For this reason, a shrinkage correction is included in both calculation methods. Four models (Al, A2, B1 and B2) for predicting the drying behavior are obtained as the result of the calculation cited programs. It is shown that the calculated effective diffusion coefficient determined by the designed computer programs, using experimentally obtained and selected published data sets have similar values to those of the same coefficient reported in the literature. Based on the mathematically determined prognostic values of the effective diffusion coefficient, it was concluded that there is more than 90% agreement between the experimentally recorded and the calculated drying curves.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering and Processing-Process Intensification
T1  - Determination of the moisture diffusivity coefficient and mathematical modeling of drying
EP  - 44
SP  - 33
VL  - 76
DO  - 10.1016/j.cep.2013.12.003
ER  - 

@article{
author = "Vasić, Miloš and Grbavčić, Željko and Radojević, Zagorka",
year = "2014",
abstract = "Drying plays an important role in the production of clay tiles. In the present article, drying process is analyzed taking experimental data for several masonry clays obtained from different clay tile manufacturers and published data for different clay slabs. Calculation methods and computer programs designed for the calculation of the effective diffusion coefficient are developed. The first calculation method represents the analytical solution of the Crank equation, while the second one represents the analytical solution of the Efremov equation with boundary conditions in the form of the flux. Unlike other materials, clay tiles exhibit shrinkage during the drying process. For this reason, a shrinkage correction is included in both calculation methods. Four models (Al, A2, B1 and B2) for predicting the drying behavior are obtained as the result of the calculation cited programs. It is shown that the calculated effective diffusion coefficient determined by the designed computer programs, using experimentally obtained and selected published data sets have similar values to those of the same coefficient reported in the literature. Based on the mathematically determined prognostic values of the effective diffusion coefficient, it was concluded that there is more than 90% agreement between the experimentally recorded and the calculated drying curves.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering and Processing-Process Intensification",
title = "Determination of the moisture diffusivity coefficient and mathematical modeling of drying",
pages = "44-33",
volume = "76",
doi = "10.1016/j.cep.2013.12.003"
}

Vasić, M., Grbavčić, Ž.,& Radojević, Z.. (2014). Determination of the moisture diffusivity coefficient and mathematical modeling of drying. in Chemical Engineering and Processing-Process Intensification
Elsevier Science Sa, Lausanne., 76, 33-44.
https://doi.org/10.1016/j.cep.2013.12.003

Vasić M, Grbavčić Ž, Radojević Z. Determination of the moisture diffusivity coefficient and mathematical modeling of drying. in Chemical Engineering and Processing-Process Intensification. 2014;76:33-44.
doi:10.1016/j.cep.2013.12.003 .

Vasić, Miloš, Grbavčić, Željko, Radojević, Zagorka, "Determination of the moisture diffusivity coefficient and mathematical modeling of drying" in Chemical Engineering and Processing-Process Intensification, 76 (2014):33-44,
https://doi.org/10.1016/j.cep.2013.12.003 . .

TY  - JOUR
AU  - Arsenović, Milica
AU  - Pezo, Lato
AU  - Stanković, Slavka
AU  - Radojević, Zagorka
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5715
AB  - Compressive strength and water absorption of fired heavy clay products varies with firing temperatures, but not entirely according to linear function, as it is mostly reported in literature. Also, differential thermo-gravimetric curve shows many turnovers in all the samples tested, within observed temperature range (820-920 degrees C). The aim of this research was to find a cause for such behaviour. Except derivative weight (DW), compressive strength (CS) and water absorption (WA) are chosen as outputs that represent properties of the fired samples. These parameters can be calculated using second order polynomial models (SOPs), on the basis of content of major oxides and firing temperature, as shown in our previous research. Sensitivity analysis was used as the effective approach in testing changes observed in the SOP outputs, due to the variation of content of major oxides for +1% or -1% of their nominal value. This study reveals in more detail the most significant influence of inputs (SiO2, Al2O3, Fe2O3 and CaO content) over the outputs (DW, CS and WA) in every observed firing temperature. Addition or lowering of content of major oxides can both increase and decrease all the observed outputs, as revealed using sensitivity analysis.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Sensitivity analysis of mathematical models for final product properties: Link to DTG curve
EP  - 6285
IS  - 6
SP  - 6277
VL  - 39
DO  - 10.1016/j.ceramint.2013.01.049
ER  - 

@article{
author = "Arsenović, Milica and Pezo, Lato and Stanković, Slavka and Radojević, Zagorka",
year = "2013",
abstract = "Compressive strength and water absorption of fired heavy clay products varies with firing temperatures, but not entirely according to linear function, as it is mostly reported in literature. Also, differential thermo-gravimetric curve shows many turnovers in all the samples tested, within observed temperature range (820-920 degrees C). The aim of this research was to find a cause for such behaviour. Except derivative weight (DW), compressive strength (CS) and water absorption (WA) are chosen as outputs that represent properties of the fired samples. These parameters can be calculated using second order polynomial models (SOPs), on the basis of content of major oxides and firing temperature, as shown in our previous research. Sensitivity analysis was used as the effective approach in testing changes observed in the SOP outputs, due to the variation of content of major oxides for +1% or -1% of their nominal value. This study reveals in more detail the most significant influence of inputs (SiO2, Al2O3, Fe2O3 and CaO content) over the outputs (DW, CS and WA) in every observed firing temperature. Addition or lowering of content of major oxides can both increase and decrease all the observed outputs, as revealed using sensitivity analysis.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Sensitivity analysis of mathematical models for final product properties: Link to DTG curve",
pages = "6285-6277",
number = "6",
volume = "39",
doi = "10.1016/j.ceramint.2013.01.049"
}

Arsenović, M., Pezo, L., Stanković, S.,& Radojević, Z.. (2013). Sensitivity analysis of mathematical models for final product properties: Link to DTG curve. in Ceramics International
Elsevier Sci Ltd, Oxford., 39(6), 6277-6285.
https://doi.org/10.1016/j.ceramint.2013.01.049

Arsenović M, Pezo L, Stanković S, Radojević Z. Sensitivity analysis of mathematical models for final product properties: Link to DTG curve. in Ceramics International. 2013;39(6):6277-6285.
doi:10.1016/j.ceramint.2013.01.049 .

Arsenović, Milica, Pezo, Lato, Stanković, Slavka, Radojević, Zagorka, "Sensitivity analysis of mathematical models for final product properties: Link to DTG curve" in Ceramics International, 39, no. 6 (2013):6277-6285,
https://doi.org/10.1016/j.ceramint.2013.01.049 . .

TY  - JOUR
AU  - Arsenović, Milica
AU  - Stanković, Slavka
AU  - Radojević, Zagorka
AU  - Pezo, Lato
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5711
AB  - Many factors influence final clay brick properties, since the raw materials used are highly heterogeneous. Statistical analysis is rarely used, according to literature, but it would improve understanding of the overall system behavior and the quality of products. In this study, analysis of variance (ANOVA) showed that the most important parameters influencing compressive strength (CS) were the quadratic terms of firing temperature, CaO and SiO2 content in developed second order polynomial (SOP) models. Water absorption (WA) was mostly influenced by quadratic terms of CaO and SiO2. The most influential interchange terms in all the models were SiO2 x CaO, SiO2 x Na2O, Fe2O3 x Na2O, CaO x Na2O and CaO x K2O. Developed SOP models, which connected the influence of major oxides content and firing temperature on CS and WA, showed the highest r(2) values (0.926-0.967) obtained in the literature so far, for these naturally occurring heavy clay raw materials. Developed models were able to predict CS and WA in a wide range of chemical composition and temperature treatment data. The implementation of the SOP model is simple using the set of equations in a spreadsheet. The focus of this study was to determine the optimal composition and firing temperature, depending on final usage of the raw material in heavy clay brick industry. The study was conducted using fuzzy synthetic evaluation, through membership trapezoidal function, with pre-defined optimal interval values for every group of heavy clay products. The optimal samples chemical composition and firing temperature were chosen regarding the kind of the heavy clay product (I-solid bricks, II-hollow blocks and ceiling elements, and III-roof tiles).
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Prediction and fuzzy synthetic optimization of process parameters in heavy clay brick production
EP  - 2022
IS  - 2
SP  - 2013
VL  - 39
DO  - 10.1016/j.ceramint.2012.08.053
ER  - 

@article{
author = "Arsenović, Milica and Stanković, Slavka and Radojević, Zagorka and Pezo, Lato",
year = "2013",
abstract = "Many factors influence final clay brick properties, since the raw materials used are highly heterogeneous. Statistical analysis is rarely used, according to literature, but it would improve understanding of the overall system behavior and the quality of products. In this study, analysis of variance (ANOVA) showed that the most important parameters influencing compressive strength (CS) were the quadratic terms of firing temperature, CaO and SiO2 content in developed second order polynomial (SOP) models. Water absorption (WA) was mostly influenced by quadratic terms of CaO and SiO2. The most influential interchange terms in all the models were SiO2 x CaO, SiO2 x Na2O, Fe2O3 x Na2O, CaO x Na2O and CaO x K2O. Developed SOP models, which connected the influence of major oxides content and firing temperature on CS and WA, showed the highest r(2) values (0.926-0.967) obtained in the literature so far, for these naturally occurring heavy clay raw materials. Developed models were able to predict CS and WA in a wide range of chemical composition and temperature treatment data. The implementation of the SOP model is simple using the set of equations in a spreadsheet. The focus of this study was to determine the optimal composition and firing temperature, depending on final usage of the raw material in heavy clay brick industry. The study was conducted using fuzzy synthetic evaluation, through membership trapezoidal function, with pre-defined optimal interval values for every group of heavy clay products. The optimal samples chemical composition and firing temperature were chosen regarding the kind of the heavy clay product (I-solid bricks, II-hollow blocks and ceiling elements, and III-roof tiles).",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Prediction and fuzzy synthetic optimization of process parameters in heavy clay brick production",
pages = "2022-2013",
number = "2",
volume = "39",
doi = "10.1016/j.ceramint.2012.08.053"
}

Arsenović, M., Stanković, S., Radojević, Z.,& Pezo, L.. (2013). Prediction and fuzzy synthetic optimization of process parameters in heavy clay brick production. in Ceramics International
Elsevier Sci Ltd, Oxford., 39(2), 2013-2022.
https://doi.org/10.1016/j.ceramint.2012.08.053

Arsenović M, Stanković S, Radojević Z, Pezo L. Prediction and fuzzy synthetic optimization of process parameters in heavy clay brick production. in Ceramics International. 2013;39(2):2013-2022.
doi:10.1016/j.ceramint.2012.08.053 .

Arsenović, Milica, Stanković, Slavka, Radojević, Zagorka, Pezo, Lato, "Prediction and fuzzy synthetic optimization of process parameters in heavy clay brick production" in Ceramics International, 39, no. 2 (2013):2013-2022,
https://doi.org/10.1016/j.ceramint.2012.08.053 . .

TY  - JOUR
AU  - Arsenović, Milica
AU  - Stanković, Slavka
AU  - Pezo, Lato
AU  - Mančić, Lidija
AU  - Radojević, Zagorka
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5708
AB  - Loess clays are commonly used to produce bricks. Heavy clays, taken at location near Zrenjanin, Serbia, are used as a representative raw material in this study. The sample, containing about 28% of clay sized particles, is enriched using two more plastic heavy clays from neighboring locations. Chemical and mineralogical content of clays is determined, as well as particle size distribution. Optimization of the processing parameters during the bricks production, i. e. temperature (900–1100 °C), and concentration of 2 clays combined addition (both in the range of 0–10%), is done based on the following independent parameters: compressive strength (CS), water absorption (WA), firing shrinkage (FS), weight loss during firing (WLF) and apparent density expressed as volume mass of cubes (VMC). Developed models showed r2 values in the range of 0.822–0.998, and they were able to accurately predict CS, WA, FS, WLF and VMC in a wide range of processing parameters. The optimum conditions are determined by the response surface method (RSM), coupled with the fuzzy synthetic evaluation (FSE) algorithm, using membership trapezoidal function, with defined optimal interval values, depending on a final usage of the raw material in heavy clay brick industry.
PB  - Elsevier
T2  - Ceramics International
T1  - Optimization of the production process through response surface method: Bricks made of loess
EP  - 3075
IS  - 3
SP  - 3065
VL  - 39
DO  - 10.1016/j.ceramint.2012.09.086
UR  - https://hdl.handle.net/21.15107/rcub_dais_341
ER  - 

@article{
author = "Arsenović, Milica and Stanković, Slavka and Pezo, Lato and Mančić, Lidija and Radojević, Zagorka",
year = "2013",
abstract = "Loess clays are commonly used to produce bricks. Heavy clays, taken at location near Zrenjanin, Serbia, are used as a representative raw material in this study. The sample, containing about 28% of clay sized particles, is enriched using two more plastic heavy clays from neighboring locations. Chemical and mineralogical content of clays is determined, as well as particle size distribution. Optimization of the processing parameters during the bricks production, i. e. temperature (900–1100 °C), and concentration of 2 clays combined addition (both in the range of 0–10%), is done based on the following independent parameters: compressive strength (CS), water absorption (WA), firing shrinkage (FS), weight loss during firing (WLF) and apparent density expressed as volume mass of cubes (VMC). Developed models showed r2 values in the range of 0.822–0.998, and they were able to accurately predict CS, WA, FS, WLF and VMC in a wide range of processing parameters. The optimum conditions are determined by the response surface method (RSM), coupled with the fuzzy synthetic evaluation (FSE) algorithm, using membership trapezoidal function, with defined optimal interval values, depending on a final usage of the raw material in heavy clay brick industry.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Optimization of the production process through response surface method: Bricks made of loess",
pages = "3075-3065",
number = "3",
volume = "39",
doi = "10.1016/j.ceramint.2012.09.086",
url = "https://hdl.handle.net/21.15107/rcub_dais_341"
}

Arsenović, M., Stanković, S., Pezo, L., Mančić, L.,& Radojević, Z.. (2013). Optimization of the production process through response surface method: Bricks made of loess. in Ceramics International
Elsevier., 39(3), 3065-3075.
https://doi.org/10.1016/j.ceramint.2012.09.086
https://hdl.handle.net/21.15107/rcub_dais_341

Arsenović M, Stanković S, Pezo L, Mančić L, Radojević Z. Optimization of the production process through response surface method: Bricks made of loess. in Ceramics International. 2013;39(3):3065-3075.
doi:10.1016/j.ceramint.2012.09.086
https://hdl.handle.net/21.15107/rcub_dais_341 .

Arsenović, Milica, Stanković, Slavka, Pezo, Lato, Mančić, Lidija, Radojević, Zagorka, "Optimization of the production process through response surface method: Bricks made of loess" in Ceramics International, 39, no. 3 (2013):3065-3075,
https://doi.org/10.1016/j.ceramint.2012.09.086 .,
https://hdl.handle.net/21.15107/rcub_dais_341 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Radojević, Zagorka
AU  - Miličić, Ljiljana
AU  - Pavlović, Ljubica
AU  - Aćimović, Zagorka
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5697
AB  - Odlaganje letećeg pepela dobijenog u procesu sagorevanja uglja u termo-elektranama predstavlja veliki rizik za prirodnu sredinu zbog mogućnosti luženja opasnih čestica kao što su toksični metali. Takođe, opasnost od izluživanja je prisutna čak i kada je leteći pepeo ugrađen u konstukcioni kompozit. Leteći pepeli sa različitih deponija su upotrebljeni za spravljanje uzoraka različitih kompozita (malter, beton ili opeka) pri čemu na pepelu nije sproveden nikakav fizički ili termički pred-tretman. Ispitivano je luženje potencijalno toksičnih elemenata prisutnih u proizvodima na bazi letećeg pepela. Praćeno je izluživanje i mogući uticaj na prirodnu sredinu 11 potencijalno opasnih elemenata: Pb, Cd, Zn, Cu, Ni, Cr, Hg, As, Ba, Sb i Se. Sprovedeno je detaljno istraživanje fizičko-hemijskih svojstava letećeg pepela, sa posebnim naglaskom na ispitivanju hemijskog sastava i prisutnosti elemenata u tragovima. Fizičko-hemijska svojstva pepela su ispitivana sledećim metodama: X-ray fluorescenicija, difrakciona termička analiza i X-ray difrakciona metoda. Skenirajući elektronski mikroskop je primenjen u mikrostukturnoj analizi. Rezultati su pokazali da se većina elemenata lakše izlužuje iz pepela nego kompozita spravljenih na bazi pepela. Izluživanje svih ispitivanih toksičnih elemenata je bilo u dozvoljenim granicama što znači da se ispitivani leteći pepeo može upotrebiti u proizvodnji konstrukcionih materijala.
AB  - The disposal of fly ash generated in coal based power-plants may pose a significant risk to the environment due to the possible leaching of hazardous pollutants, such as toxic metals. Also, there is a risk of leaching even when fly ash is built in the construction composites. Fly ashes from various landfills were applied in several composite samples (mortar, concrete and brick) without any physical or thermal pre-treatment. The leachability of the potentially toxic pollutants from the fly ash based products was investigated. The leaching behaviour and potential environmental impact of 11 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 fly ash, with an accent on trace elements and the chemical composition investigation is included. Physicochemical properties of fly ash were investigated by means of X-ray fluorescence, differential thermal analysis and X-ray diffraction methods. Scanning electron microscopy was used in microstructure analysis. The results show that most of the elements are more easily leachable from the fly ash in comparison to the fly ash based composites. The leaching of investigated pollutants is within allowed range thus investigated fly ashes can be reused in construction materials production.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Luženje potencijalno toksičnih elemenata iz kompozita na bazi otpadnih sirovina
T1  - Leaching of the potentially toxic pollutants from composites based on waste raw material
EP  - 383
IS  - 3
SP  - 373
VL  - 18
DO  - 10.2298/CICEQ111128013T
ER  - 

@article{
author = "Terzić, Anja and Radojević, Zagorka and Miličić, Ljiljana and Pavlović, Ljubica and Aćimović, Zagorka",
year = "2012",
abstract = "Odlaganje letećeg pepela dobijenog u procesu sagorevanja uglja u termo-elektranama predstavlja veliki rizik za prirodnu sredinu zbog mogućnosti luženja opasnih čestica kao što su toksični metali. Takođe, opasnost od izluživanja je prisutna čak i kada je leteći pepeo ugrađen u konstukcioni kompozit. Leteći pepeli sa različitih deponija su upotrebljeni za spravljanje uzoraka različitih kompozita (malter, beton ili opeka) pri čemu na pepelu nije sproveden nikakav fizički ili termički pred-tretman. Ispitivano je luženje potencijalno toksičnih elemenata prisutnih u proizvodima na bazi letećeg pepela. Praćeno je izluživanje i mogući uticaj na prirodnu sredinu 11 potencijalno opasnih elemenata: Pb, Cd, Zn, Cu, Ni, Cr, Hg, As, Ba, Sb i Se. Sprovedeno je detaljno istraživanje fizičko-hemijskih svojstava letećeg pepela, sa posebnim naglaskom na ispitivanju hemijskog sastava i prisutnosti elemenata u tragovima. Fizičko-hemijska svojstva pepela su ispitivana sledećim metodama: X-ray fluorescenicija, difrakciona termička analiza i X-ray difrakciona metoda. Skenirajući elektronski mikroskop je primenjen u mikrostukturnoj analizi. Rezultati su pokazali da se većina elemenata lakše izlužuje iz pepela nego kompozita spravljenih na bazi pepela. Izluživanje svih ispitivanih toksičnih elemenata je bilo u dozvoljenim granicama što znači da se ispitivani leteći pepeo može upotrebiti u proizvodnji konstrukcionih materijala., The disposal of fly ash generated in coal based power-plants may pose a significant risk to the environment due to the possible leaching of hazardous pollutants, such as toxic metals. Also, there is a risk of leaching even when fly ash is built in the construction composites. Fly ashes from various landfills were applied in several composite samples (mortar, concrete and brick) without any physical or thermal pre-treatment. The leachability of the potentially toxic pollutants from the fly ash based products was investigated. The leaching behaviour and potential environmental impact of 11 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 fly ash, with an accent on trace elements and the chemical composition investigation is included. Physicochemical properties of fly ash were investigated by means of X-ray fluorescence, differential thermal analysis and X-ray diffraction methods. Scanning electron microscopy was used in microstructure analysis. The results show that most of the elements are more easily leachable from the fly ash in comparison to the fly ash based composites. The leaching of investigated pollutants is within allowed range thus investigated fly ashes can be reused in construction materials production.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Luženje potencijalno toksičnih elemenata iz kompozita na bazi otpadnih sirovina, Leaching of the potentially toxic pollutants from composites based on waste raw material",
pages = "383-373",
number = "3",
volume = "18",
doi = "10.2298/CICEQ111128013T"
}

Terzić, A., Radojević, Z., Miličić, L., Pavlović, L.,& Aćimović, Z.. (2012). Luženje potencijalno toksičnih elemenata iz kompozita na bazi otpadnih sirovina. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Savez hemijskih inženjera, Beograd., 18(3), 373-383.
https://doi.org/10.2298/CICEQ111128013T

Terzić A, Radojević Z, Miličić L, Pavlović L, Aćimović Z. Luženje potencijalno toksičnih elemenata iz kompozita na bazi otpadnih sirovina. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2012;18(3):373-383.
doi:10.2298/CICEQ111128013T .

Terzić, Anja, Radojević, Zagorka, Miličić, Ljiljana, Pavlović, Ljubica, Aćimović, Zagorka, "Luženje potencijalno toksičnih elemenata iz kompozita na bazi otpadnih sirovina" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 18, no. 3 (2012):373-383,
https://doi.org/10.2298/CICEQ111128013T . .

TY  - JOUR
AU  - Arsenović, Milica
AU  - Radojević, Zagorka
AU  - Stanković, Slavka
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5736
AB  - The aim of this study was to test utilization possibilities of industrial sludge in masonry industry, as well as risk of toxic elements leaching potential. Sludge is generated in a hot-dip galvanizing process after waste water neutralization. This waste is considered to be hazardous due to the presence of toxic elements, which can be fixed within heavy clay matrix after thermal treatment. Relatively large amounts of toxic metals were found in used raw materials, but their leachability reduces to a negligible level after firing at 1020 degrees C. The results show that sludge can be used to produce eco-friendly bricks.
PB  - Elsevier Sci Ltd, Oxford
T2  - Construction and Building Materials
T1  - Removal of toxic metals from industrial sludge by fixing in brick structure
EP  - 14
SP  - 7
VL  - 37
DO  - 10.1016/j.conbuildmat.2012.07.002
ER  - 

@article{
author = "Arsenović, Milica and Radojević, Zagorka and Stanković, Slavka",
year = "2012",
abstract = "The aim of this study was to test utilization possibilities of industrial sludge in masonry industry, as well as risk of toxic elements leaching potential. Sludge is generated in a hot-dip galvanizing process after waste water neutralization. This waste is considered to be hazardous due to the presence of toxic elements, which can be fixed within heavy clay matrix after thermal treatment. Relatively large amounts of toxic metals were found in used raw materials, but their leachability reduces to a negligible level after firing at 1020 degrees C. The results show that sludge can be used to produce eco-friendly bricks.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Construction and Building Materials",
title = "Removal of toxic metals from industrial sludge by fixing in brick structure",
pages = "14-7",
volume = "37",
doi = "10.1016/j.conbuildmat.2012.07.002"
}

Arsenović, M., Radojević, Z.,& Stanković, S.. (2012). Removal of toxic metals from industrial sludge by fixing in brick structure. in Construction and Building Materials
Elsevier Sci Ltd, Oxford., 37, 7-14.
https://doi.org/10.1016/j.conbuildmat.2012.07.002

Arsenović M, Radojević Z, Stanković S. Removal of toxic metals from industrial sludge by fixing in brick structure. in Construction and Building Materials. 2012;37:7-14.
doi:10.1016/j.conbuildmat.2012.07.002 .

Arsenović, Milica, Radojević, Zagorka, Stanković, Slavka, "Removal of toxic metals from industrial sludge by fixing in brick structure" in Construction and Building Materials, 37 (2012):7-14,
https://doi.org/10.1016/j.conbuildmat.2012.07.002 . .

TY  - JOUR
AU  - Vasić, Miloš
AU  - Radojević, Zagorka
AU  - Grbavčić, Željko
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5669
AB  - Cilj ovog rada je da se na primeru dve opekarske gline sa različitih lokaliteta odredi efektivni koeficijenat difuzije na osnovu eksperimentalno snimljenih krivih sušenja. Razvijen je metod i napravljena su dva kompjuterska programa za određivanje ovog koeficijenta, koji se zasnivaju na matematičkom rešavanju Fikove, odnosno Krankove difuzione jednačine. Po prvi put uzeto je u razmatranje i skupljanje opekarskih proizvoda u toku sušenja a odgovarajuća korekcija je uneta u proračun. Rezultati pokazuju da su vrednosti efektivnog koeficijenta difuzije određeni kompjuterskim programima (sa korekcijom i bez korekcije na skupljanje opekarskih proizvoda) reda veličine koje su navedene u literaturi za druge vrste opekarskih glina. Na osnovu matematičkim putem prognoziranih vrednosti efektivnog koeficijenta difuzije konstatovano je, da bez obzira na polazni mineraloški sastav opekarske sirovine, postoji 90 % slaganja prognoziranih krivih sušenja sa eksperimentalno snimljenim krivima sušenja. Za slučaj kada je uvedena u proračune i korekcija na skupljanje opekarskih proizvoda ovo slaganje je još veće.
AB  - The aim of this study was to calculate the effective diffusion coefficient based on experimentally recorded drying curves for two masonry clays obtained from different localities. The calculation method and two computer programs based on the mathematical calculation of the Second Fick Law and the Cranck Diffusion Equation were developed. Masonry product shrinkage during drying was taken into consideration for the first time and the appropriate correction was entered into the calculation. The results presented in this paper show that the values of the effective diffusion coefficient determined by the designed computer programs (with and without the correction for shrinkage) have similar values to those available in the literature for the same coefficient for different clays. Based on the mathematically determined prognostic value of the effective diffusion coefficient, it was concluded that, whatever the initial mineralogical composition of the clay, there is 90 % agreement of the calculated prognostic drying curves with the experimentally recorded ones. When a shrinkage correction of the masonry products is introduced into the calculation step, this agreement is even better.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline
T1  - Calculation of the effective diffusion coefficient during the drying of clay samples
EP  - 533
IS  - 4
SP  - 523
VL  - 77
DO  - 10.2298/JSC110717191V
ER  - 

@article{
author = "Vasić, Miloš and Radojević, Zagorka and Grbavčić, Željko",
year = "2012",
abstract = "Cilj ovog rada je da se na primeru dve opekarske gline sa različitih lokaliteta odredi efektivni koeficijenat difuzije na osnovu eksperimentalno snimljenih krivih sušenja. Razvijen je metod i napravljena su dva kompjuterska programa za određivanje ovog koeficijenta, koji se zasnivaju na matematičkom rešavanju Fikove, odnosno Krankove difuzione jednačine. Po prvi put uzeto je u razmatranje i skupljanje opekarskih proizvoda u toku sušenja a odgovarajuća korekcija je uneta u proračun. Rezultati pokazuju da su vrednosti efektivnog koeficijenta difuzije određeni kompjuterskim programima (sa korekcijom i bez korekcije na skupljanje opekarskih proizvoda) reda veličine koje su navedene u literaturi za druge vrste opekarskih glina. Na osnovu matematičkim putem prognoziranih vrednosti efektivnog koeficijenta difuzije konstatovano je, da bez obzira na polazni mineraloški sastav opekarske sirovine, postoji 90 % slaganja prognoziranih krivih sušenja sa eksperimentalno snimljenim krivima sušenja. Za slučaj kada je uvedena u proračune i korekcija na skupljanje opekarskih proizvoda ovo slaganje je još veće., The aim of this study was to calculate the effective diffusion coefficient based on experimentally recorded drying curves for two masonry clays obtained from different localities. The calculation method and two computer programs based on the mathematical calculation of the Second Fick Law and the Cranck Diffusion Equation were developed. Masonry product shrinkage during drying was taken into consideration for the first time and the appropriate correction was entered into the calculation. The results presented in this paper show that the values of the effective diffusion coefficient determined by the designed computer programs (with and without the correction for shrinkage) have similar values to those available in the literature for the same coefficient for different clays. Based on the mathematically determined prognostic value of the effective diffusion coefficient, it was concluded that, whatever the initial mineralogical composition of the clay, there is 90 % agreement of the calculated prognostic drying curves with the experimentally recorded ones. When a shrinkage correction of the masonry products is introduced into the calculation step, this agreement is even better.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline, Calculation of the effective diffusion coefficient during the drying of clay samples",
pages = "533-523",
number = "4",
volume = "77",
doi = "10.2298/JSC110717191V"
}

Vasić, M., Radojević, Z.,& Grbavčić, Ž.. (2012). Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 77(4), 523-533.
https://doi.org/10.2298/JSC110717191V

Vasić M, Radojević Z, Grbavčić Ž. Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline. in Journal of the Serbian Chemical Society. 2012;77(4):523-533.
doi:10.2298/JSC110717191V .

Vasić, Miloš, Radojević, Zagorka, Grbavčić, Željko, "Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline" in Journal of the Serbian Chemical Society, 77, no. 4 (2012):523-533,
https://doi.org/10.2298/JSC110717191V . .

TY  - JOUR
AU  - Lalić, Željko
AU  - Arsenović, Milica
AU  - Janaćković, Đorđe
AU  - Vasić, Miloš
AU  - Radojević, Zagorka
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1365
AB  - In this paper are presented testing results during process of fast drying at conditions of increased temperature. Three different masonry raw materials were examined using recircular laboratory dryer with air recirculation. It is concluded that samples containing more clay minerals and having better bind qualities are appropriate for increased temperature fast drying appliance. Raw materials which do not belong to the mentioned group can not be used in these processes, even in the case of slower drying regime, although their both physical and mechanical (technological) characteristics do not refer to such behavior.
T2  - Revista Romana de Materiale/ Romanian Journal of Materials
T1  - Influence of increased temperature on clay fast drying process
EP  - 179
IS  - 3
SP  - 175
VL  - 39
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1365
ER  - 

@article{
author = "Lalić, Željko and Arsenović, Milica and Janaćković, Đorđe and Vasić, Miloš and Radojević, Zagorka",
year = "2009",
abstract = "In this paper are presented testing results during process of fast drying at conditions of increased temperature. Three different masonry raw materials were examined using recircular laboratory dryer with air recirculation. It is concluded that samples containing more clay minerals and having better bind qualities are appropriate for increased temperature fast drying appliance. Raw materials which do not belong to the mentioned group can not be used in these processes, even in the case of slower drying regime, although their both physical and mechanical (technological) characteristics do not refer to such behavior.",
journal = "Revista Romana de Materiale/ Romanian Journal of Materials",
title = "Influence of increased temperature on clay fast drying process",
pages = "179-175",
number = "3",
volume = "39",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1365"
}

Lalić, Ž., Arsenović, M., Janaćković, Đ., Vasić, M.,& Radojević, Z.. (2009). Influence of increased temperature on clay fast drying process. in Revista Romana de Materiale/ Romanian Journal of Materials, 39(3), 175-179.
https://hdl.handle.net/21.15107/rcub_technorep_1365

Lalić Ž, Arsenović M, Janaćković Đ, Vasić M, Radojević Z. Influence of increased temperature on clay fast drying process. in Revista Romana de Materiale/ Romanian Journal of Materials. 2009;39(3):175-179.
https://hdl.handle.net/21.15107/rcub_technorep_1365 .

Lalić, Željko, Arsenović, Milica, Janaćković, Đorđe, Vasić, Miloš, Radojević, Zagorka, "Influence of increased temperature on clay fast drying process" in Revista Romana de Materiale/ Romanian Journal of Materials, 39, no. 3 (2009):175-179,
https://hdl.handle.net/21.15107/rcub_technorep_1365 .

TY  - JOUR
AU  - Lalić, Z.
AU  - Radojević, Zagorka
AU  - Janaćković, Đorđe
AU  - Vasić, R.
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1037
AB  - The influence of the correlation between the drying constant and the diffusion coefficient of the liquid on the behavior of two raw materials for brick manufacturing during their drying process was examined. The test was performed in a laboratory dryer with air recirculation. It has been observed that the behavior of some raw materials during "fast" drying process regimes does not depend only on external drying conditions, but also depend on internal controlling mechanisms, in this case moisture diffusion in the slab.
PB  - Techna Srl, Faenza
T2  - Industrial Ceramics
T1  - Influence of drying constant and diffusivity on clay drying behavior
EP  - 6
IS  - 1
SP  - 1
VL  - 27
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1037
ER  - 

@article{
author = "Lalić, Z. and Radojević, Zagorka and Janaćković, Đorđe and Vasić, R.",
year = "2007",
abstract = "The influence of the correlation between the drying constant and the diffusion coefficient of the liquid on the behavior of two raw materials for brick manufacturing during their drying process was examined. The test was performed in a laboratory dryer with air recirculation. It has been observed that the behavior of some raw materials during "fast" drying process regimes does not depend only on external drying conditions, but also depend on internal controlling mechanisms, in this case moisture diffusion in the slab.",
publisher = "Techna Srl, Faenza",
journal = "Industrial Ceramics",
title = "Influence of drying constant and diffusivity on clay drying behavior",
pages = "6-1",
number = "1",
volume = "27",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1037"
}

Lalić, Z., Radojević, Z., Janaćković, Đ.,& Vasić, R.. (2007). Influence of drying constant and diffusivity on clay drying behavior. in Industrial Ceramics
Techna Srl, Faenza., 27(1), 1-6.
https://hdl.handle.net/21.15107/rcub_technorep_1037

Lalić Z, Radojević Z, Janaćković Đ, Vasić R. Influence of drying constant and diffusivity on clay drying behavior. in Industrial Ceramics. 2007;27(1):1-6.
https://hdl.handle.net/21.15107/rcub_technorep_1037 .

Lalić, Z., Radojević, Zagorka, Janaćković, Đorđe, Vasić, R., "Influence of drying constant and diffusivity on clay drying behavior" in Industrial Ceramics, 27, no. 1 (2007):1-6,
https://hdl.handle.net/21.15107/rcub_technorep_1037 .