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  - Nešić, Aleksandra
AU  - Ružić, Jovana
AU  - Gordić, Milan V.
AU  - Ostojić, Sanja
AU  - Micić, Darko
AU  - Onjia, Antonije
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3696
AB  - In this work, the new biodegradable blend films composed of natural polymer pectin and synthetic polymer polyvinylpyrrolidone were obtained through casting process. The concentration of glycerol in all formulations was constant (2% v/v), while the amount of polyvinylpyrrolidone varied from 20 to 60% by mass of pectin. The molecular interactions between two components were elucidated by FTIR-ATR spectroscopy, while functional properties of these films were carried out by determination of puncture resistance, tensile strength, thermal stability, water vapor barrier, wettability and printability. The blending of pectin with PVP led to an improvement of mechanical resistance, barrier properties and hydrophobicity of these films for 57%, 58 and 24%, respectively, remaining adequate thermal stability. Since pectin and PVP are nontoxic, food-grade and biodegradable materials, this research present an ecosustainable approach to provide films with satisfied physical properties for use as packaging material of non-food products, such as water-treatment products (detergents, biocides, agrochemical compounds).
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Part B-Engineering
T1  - Pectin-polyvinylpyrrolidone films: A sustainable approach to the development of biobased packaging materials
EP  - 61
SP  - 56
VL  - 110
DO  - 10.1016/j.compositesb.2016.11.016
ER  - 

@article{
author = "Nešić, Aleksandra and Ružić, Jovana and Gordić, Milan V. and Ostojić, Sanja and Micić, Darko and Onjia, Antonije",
year = "2017",
abstract = "In this work, the new biodegradable blend films composed of natural polymer pectin and synthetic polymer polyvinylpyrrolidone were obtained through casting process. The concentration of glycerol in all formulations was constant (2% v/v), while the amount of polyvinylpyrrolidone varied from 20 to 60% by mass of pectin. The molecular interactions between two components were elucidated by FTIR-ATR spectroscopy, while functional properties of these films were carried out by determination of puncture resistance, tensile strength, thermal stability, water vapor barrier, wettability and printability. The blending of pectin with PVP led to an improvement of mechanical resistance, barrier properties and hydrophobicity of these films for 57%, 58 and 24%, respectively, remaining adequate thermal stability. Since pectin and PVP are nontoxic, food-grade and biodegradable materials, this research present an ecosustainable approach to provide films with satisfied physical properties for use as packaging material of non-food products, such as water-treatment products (detergents, biocides, agrochemical compounds).",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Part B-Engineering",
title = "Pectin-polyvinylpyrrolidone films: A sustainable approach to the development of biobased packaging materials",
pages = "61-56",
volume = "110",
doi = "10.1016/j.compositesb.2016.11.016"
}

Nešić, A., Ružić, J., Gordić, M. V., Ostojić, S., Micić, D.,& Onjia, A.. (2017). Pectin-polyvinylpyrrolidone films: A sustainable approach to the development of biobased packaging materials. in Composites Part B-Engineering
Elsevier Sci Ltd, Oxford., 110, 56-61.
https://doi.org/10.1016/j.compositesb.2016.11.016

Nešić A, Ružić J, Gordić MV, Ostojić S, Micić D, Onjia A. Pectin-polyvinylpyrrolidone films: A sustainable approach to the development of biobased packaging materials. in Composites Part B-Engineering. 2017;110:56-61.
doi:10.1016/j.compositesb.2016.11.016 .

Nešić, Aleksandra, Ružić, Jovana, Gordić, Milan V., Ostojić, Sanja, Micić, Darko, Onjia, Antonije, "Pectin-polyvinylpyrrolidone films: A sustainable approach to the development of biobased packaging materials" in Composites Part B-Engineering, 110 (2017):56-61,
https://doi.org/10.1016/j.compositesb.2016.11.016 . .

TY  - JOUR
AU  - Nešić, Aleksandra
AU  - Panić, Vesna
AU  - Ostojić, Sanja
AU  - Micić, Darko
AU  - Pajić-Lijaković, Ivana
AU  - Onjia, Antonije
AU  - Veličković, Sava
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3415
AB  - This article described the synthesis and characterization of new copolymer hydrogels containing two hydrophilic units-methacrylic acid (MAA) and 2-Acrylamido-2-methylpropane sulfonic acid (AMPS). The resulting hydrogels were characterized by various techniques: FTIR, Elemental analysis, SEM, Dynamic Molecular simulation, Dynamic-Mechanical analysis and DSC in order to confirm the structure of hydrogels and to predict the best ratio composition with enhanced physical chemical properties. The swelling behavior in water was studied as a function of ratio of monomers and their concentration in medium. An increase in AMPS content led to expansion of network and increase in swelling degree capacity in water. An increase in AMPS content did not significantly influence the glass transition temperature of copolymers, indicated that the physical properties of initial components were preserved. The equal amount of monomers contributed to the highest strength of hydrogels. Meanwhile, the introduction of AMPS to the system was an effective method for improving the performances of the poly(methacrylic acid)- based hydrogels.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid
EP  - 163
SP  - 156
VL  - 174
DO  - 10.1016/j.matchemphys.2016.02.063
ER  - 

@article{
author = "Nešić, Aleksandra and Panić, Vesna and Ostojić, Sanja and Micić, Darko and Pajić-Lijaković, Ivana and Onjia, Antonije and Veličković, Sava",
year = "2016",
abstract = "This article described the synthesis and characterization of new copolymer hydrogels containing two hydrophilic units-methacrylic acid (MAA) and 2-Acrylamido-2-methylpropane sulfonic acid (AMPS). The resulting hydrogels were characterized by various techniques: FTIR, Elemental analysis, SEM, Dynamic Molecular simulation, Dynamic-Mechanical analysis and DSC in order to confirm the structure of hydrogels and to predict the best ratio composition with enhanced physical chemical properties. The swelling behavior in water was studied as a function of ratio of monomers and their concentration in medium. An increase in AMPS content led to expansion of network and increase in swelling degree capacity in water. An increase in AMPS content did not significantly influence the glass transition temperature of copolymers, indicated that the physical properties of initial components were preserved. The equal amount of monomers contributed to the highest strength of hydrogels. Meanwhile, the introduction of AMPS to the system was an effective method for improving the performances of the poly(methacrylic acid)- based hydrogels.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid",
pages = "163-156",
volume = "174",
doi = "10.1016/j.matchemphys.2016.02.063"
}

Nešić, A., Panić, V., Ostojić, S., Micić, D., Pajić-Lijaković, I., Onjia, A.,& Veličković, S.. (2016). Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 174, 156-163.
https://doi.org/10.1016/j.matchemphys.2016.02.063

Nešić A, Panić V, Ostojić S, Micić D, Pajić-Lijaković I, Onjia A, Veličković S. Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid. in Materials Chemistry and Physics. 2016;174:156-163.
doi:10.1016/j.matchemphys.2016.02.063 .

Nešić, Aleksandra, Panić, Vesna, Ostojić, Sanja, Micić, Darko, Pajić-Lijaković, Ivana, Onjia, Antonije, Veličković, Sava, "Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid" in Materials Chemistry and Physics, 174 (2016):156-163,
https://doi.org/10.1016/j.matchemphys.2016.02.063 . .

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  - 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 .