TY  - JOUR
AU  - Đorđević, Nataša
AU  - Vlahović, Milica
AU  - Martinović, Sanja
AU  - Mihajlović, Slavica
AU  - Kašić, Vladan
AU  - Grubišić, Mirko
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/681
AB  - Concrete is a material that has been used for centuries and is often modified using polymers. In the last fifty years, synthetic polymers have been used for the modification of concrete, but also for the production of concrete. In recent decades, sulfur concrete has been an interesting product that can be used mainly in low-rise construction due to its characteristics. In this work, we used the starting mixture for the preparation of sulfur concrete (sand, elemental sulfur with the addition of modified sulfur and fillers) heated to a temperature of 120 ºC to 170 ºC and homogenized. The results of previous research on the production of sulfur concrete showed that the density of the obtained product changes depending on the type as well as the amount of filler added to the basic mixture based on raw materials. Talc, microsilicon, plate alumina and fly ash were used as fillers. The amounts of fillers were 0%, 1%, 3%, 5%, 7% and 10%.
PB  - University of Belgrade - Faculty of Mining and Geology
T2  - Underground mining engineering
T1  - Influence of type and quantity of filler on change of density of sulfur concrete
EP  - 25
IS  - 42
SP  - 19
DO  - 10.5937/podrad2342019Q
ER  - 

@article{
author = "Đorđević, Nataša and Vlahović, Milica and Martinović, Sanja and Mihajlović, Slavica and Kašić, Vladan and Grubišić, Mirko",
year = "2023",
abstract = "Concrete is a material that has been used for centuries and is often modified using polymers. In the last fifty years, synthetic polymers have been used for the modification of concrete, but also for the production of concrete. In recent decades, sulfur concrete has been an interesting product that can be used mainly in low-rise construction due to its characteristics. In this work, we used the starting mixture for the preparation of sulfur concrete (sand, elemental sulfur with the addition of modified sulfur and fillers) heated to a temperature of 120 ºC to 170 ºC and homogenized. The results of previous research on the production of sulfur concrete showed that the density of the obtained product changes depending on the type as well as the amount of filler added to the basic mixture based on raw materials. Talc, microsilicon, plate alumina and fly ash were used as fillers. The amounts of fillers were 0%, 1%, 3%, 5%, 7% and 10%.",
publisher = "University of Belgrade - Faculty of Mining and Geology",
journal = "Underground mining engineering",
title = "Influence of type and quantity of filler on change of density of sulfur concrete",
pages = "25-19",
number = "42",
doi = "10.5937/podrad2342019Q"
}

Đorđević, N., Vlahović, M., Martinović, S., Mihajlović, S., Kašić, V.,& Grubišić, M.. (2023). Influence of type and quantity of filler on change of density of sulfur concrete. in Underground mining engineering
University of Belgrade - Faculty of Mining and Geology.(42), 19-25.
https://doi.org/10.5937/podrad2342019Q

Đorđević N, Vlahović M, Martinović S, Mihajlović S, Kašić V, Grubišić M. Influence of type and quantity of filler on change of density of sulfur concrete. in Underground mining engineering. 2023;(42):19-25.
doi:10.5937/podrad2342019Q .

Đorđević, Nataša, Vlahović, Milica, Martinović, Sanja, Mihajlović, Slavica, Kašić, Vladan, Grubišić, Mirko, "Influence of type and quantity of filler on change of density of sulfur concrete" in Underground mining engineering, no. 42 (2023):19-25,
https://doi.org/10.5937/podrad2342019Q . .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Vlahović, Milica
AU  - Mihajlović, Slavica
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/820
AB  - The aim of this research was to obtain an initial characterization 
of  the  BaO  and  TiO2
components,  as  well  as  to  conduct  preliminary 
research into the possibility of activating the initial components in order to
obtain barium titanate. Chemical and X-ray structural analysis of the initial 
components  was  performed.  In  order  to  determine  the  possibility  of 
applying a mechanochemical activator and the activation time in which the 
first intermediate compounds were formed by the activation of the starting 
substances, the system was activated for 30 minutes. After this, an X-ray 
structural analysis was performed and certain changes in the crystal lattice 
of  the  starting components  were  made. X-ray  structural analysis  showed that  during  grinding,  amorphization  of  the  initial  components  occurred, 
which is the first stage in the process of obtaining titanate, as well as the 
presence  of  a  small  amount  of  barium  titanate,  which  is  indicating  the 
presence of an intermediate compound in the process of finally obtaining 
barium titanate.
PB  - Belgrade : University of Belgrade, Faculty of Mining and Geology
T2  - Undeground mining engineering
T1  - X-ray structural analysis of the BaO and TiO2 starting compounds and initial mechanochemical activation
EP  - 46
IS  - 42
SP  - 37
DO  - 10.5937/podrad2342037Q
ER  - 

@article{
author = "Đorđević, Nataša and Vlahović, Milica and Mihajlović, Slavica",
year = "2023",
abstract = "The aim of this research was to obtain an initial characterization 
of  the  BaO  and  TiO2
components,  as  well  as  to  conduct  preliminary 
research into the possibility of activating the initial components in order to
obtain barium titanate. Chemical and X-ray structural analysis of the initial 
components  was  performed.  In  order  to  determine  the  possibility  of 
applying a mechanochemical activator and the activation time in which the 
first intermediate compounds were formed by the activation of the starting 
substances, the system was activated for 30 minutes. After this, an X-ray 
structural analysis was performed and certain changes in the crystal lattice 
of  the  starting components  were  made. X-ray  structural analysis  showed that  during  grinding,  amorphization  of  the  initial  components  occurred, 
which is the first stage in the process of obtaining titanate, as well as the 
presence  of  a  small  amount  of  barium  titanate,  which  is  indicating  the 
presence of an intermediate compound in the process of finally obtaining 
barium titanate.",
publisher = "Belgrade : University of Belgrade, Faculty of Mining and Geology",
journal = "Undeground mining engineering",
title = "X-ray structural analysis of the BaO and TiO2 starting compounds and initial mechanochemical activation",
pages = "46-37",
number = "42",
doi = "10.5937/podrad2342037Q"
}

Đorđević, N., Vlahović, M.,& Mihajlović, S.. (2023). X-ray structural analysis of the BaO and TiO2 starting compounds and initial mechanochemical activation. in Undeground mining engineering
Belgrade : University of Belgrade, Faculty of Mining and Geology.(42), 37-46.
https://doi.org/10.5937/podrad2342037Q

Đorđević N, Vlahović M, Mihajlović S. X-ray structural analysis of the BaO and TiO2 starting compounds and initial mechanochemical activation. in Undeground mining engineering. 2023;(42):37-46.
doi:10.5937/podrad2342037Q .

Đorđević, Nataša, Vlahović, Milica, Mihajlović, Slavica, "X-ray structural analysis of the BaO and TiO2 starting compounds and initial mechanochemical activation" in Undeground mining engineering, no. 42 (2023):37-46,
https://doi.org/10.5937/podrad2342037Q . .

TY  - CONF
AU  - Đorđević, Nataša
AU  - Peleš, Adriana
AU  - Obradović, Nina
AU  - Vlahović, Milica
AU  - Mihajlović, Slavica
AU  - Martinović, Sanja
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1136
AB  - The mechanical activation of the starting mixtures of cordierite (2MgO*2Al2O3*5SiO2) with
5.00 mass % TiO2 was performed in a high energy ball mill during 10-80 min. The applied compaction
pressure before the sintering process was 2t/cm2. The sintering process was performed at 1350°C
for 2h and 4h in air atmosphere. Scanning electron microscopy was performed to analyze the microstructure
of both compacted and sintered samples. Atomic force microscope was used to investigate
the surface of the sintered samples. This paper investigates the influence of prolonged sintering time
on the densities of the sintered samples, along with electrical properties.
PB  - Belgrade : Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) Society for Renewable Electrical Power Sources
PB  - Belgrade : Society for Renewable Electrical Power Sources
C3  - 9th International Conference on Renewable Electrical Power Sources
T1  - Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics
EP  - 268
SP  - 265
ER  - 

@conference{
author = "Đorđević, Nataša and Peleš, Adriana and Obradović, Nina and Vlahović, Milica and Mihajlović, Slavica and Martinović, Sanja",
year = "2021",
abstract = "The mechanical activation of the starting mixtures of cordierite (2MgO*2Al2O3*5SiO2) with
5.00 mass % TiO2 was performed in a high energy ball mill during 10-80 min. The applied compaction
pressure before the sintering process was 2t/cm2. The sintering process was performed at 1350°C
for 2h and 4h in air atmosphere. Scanning electron microscopy was performed to analyze the microstructure
of both compacted and sintered samples. Atomic force microscope was used to investigate
the surface of the sintered samples. This paper investigates the influence of prolonged sintering time
on the densities of the sintered samples, along with electrical properties.",
publisher = "Belgrade : Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) Society for Renewable Electrical Power Sources, Belgrade : Society for Renewable Electrical Power Sources",
journal = "9th International Conference on Renewable Electrical Power Sources",
title = "Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics",
pages = "268-265"
}

Đorđević, N., Peleš, A., Obradović, N., Vlahović, M., Mihajlović, S.,& Martinović, S.. (2021). Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics. in 9th International Conference on Renewable Electrical Power Sources
Belgrade : Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) Society for Renewable Electrical Power Sources., 265-268.

Đorđević N, Peleš A, Obradović N, Vlahović M, Mihajlović S, Martinović S. Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics. in 9th International Conference on Renewable Electrical Power Sources. 2021;:265-268..

Đorđević, Nataša, Peleš, Adriana, Obradović, Nina, Vlahović, Milica, Mihajlović, Slavica, Martinović, Sanja, "Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics" in 9th International Conference on Renewable Electrical Power Sources (2021):265-268.

TY  - JOUR
AU  - Martinović, Sanja
AU  - Vlahović, Milica
AU  - Đorđević, Nataša
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1166
AB  - Modifikacija konvencionalnih građevinskih materijala obično se izvodi upotrebom različitih otpadnih materijala. U ovom istraživanju biće prikazana upotreba sekundarnog sumpora kao veziva u betonu. Sumporni beton je termoplastični kompozit koji se sastoji od mineralnog agregata i punila, sa sumporom kao vezivom na temperaturi višoj od tačke očvršćavanja sumpora. Ovaj relativno nov građevinski materijal može da zameni konvencionalni Portland cementni beton u raznim konstrukcijama. U ovom radu biće prikazana svojstva sumpornog betona, kao i rezultati ispitivanja njegove postojanosti u agresivnim sredinama. U cilju ispitivanja svojstava, primenjene su destruktivne i nedestruktivne metode, dok su svojstva korelisana sa strukturommaterijala.
AB  - Modification of conventional building materials is commonly realized using different waste materials. In this research, the use of secondary sulfur as binding agent in concrete was analyzed. Sulfur concrete is a thermoplastic composite made of mineral aggregate and filler, with sulfur as a binder at temperature above the hardening point of sulfur. This relatively new building material can possibly replace conventional Portland cement concrete in many branches of construction. Also, in this research, sulfur concrete properties were examined, as well as its quality in the presence of the induced destruction agent. Destructive and nondestructive methods were applied and the material properties correlated with the structure.
PB  - Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina
T2  - XII Simpozijum sa međunarodnim učešćem „Rudarstvo 2021“
T1  - Possibilities of waste sulfur valorization in eco-friendly products
EP  - 101
SP  - 84
ER  - 

@article{
author = "Martinović, Sanja and Vlahović, Milica and Đorđević, Nataša",
year = "2021",
abstract = "Modifikacija konvencionalnih građevinskih materijala obično se izvodi upotrebom različitih otpadnih materijala. U ovom istraživanju biće prikazana upotreba sekundarnog sumpora kao veziva u betonu. Sumporni beton je termoplastični kompozit koji se sastoji od mineralnog agregata i punila, sa sumporom kao vezivom na temperaturi višoj od tačke očvršćavanja sumpora. Ovaj relativno nov građevinski materijal može da zameni konvencionalni Portland cementni beton u raznim konstrukcijama. U ovom radu biće prikazana svojstva sumpornog betona, kao i rezultati ispitivanja njegove postojanosti u agresivnim sredinama. U cilju ispitivanja svojstava, primenjene su destruktivne i nedestruktivne metode, dok su svojstva korelisana sa strukturommaterijala., Modification of conventional building materials is commonly realized using different waste materials. In this research, the use of secondary sulfur as binding agent in concrete was analyzed. Sulfur concrete is a thermoplastic composite made of mineral aggregate and filler, with sulfur as a binder at temperature above the hardening point of sulfur. This relatively new building material can possibly replace conventional Portland cement concrete in many branches of construction. Also, in this research, sulfur concrete properties were examined, as well as its quality in the presence of the induced destruction agent. Destructive and nondestructive methods were applied and the material properties correlated with the structure.",
publisher = "Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina",
journal = "XII Simpozijum sa međunarodnim učešćem „Rudarstvo 2021“",
title = "Possibilities of waste sulfur valorization in eco-friendly products",
pages = "101-84"
}

Martinović, S., Vlahović, M.,& Đorđević, N.. (2021). Possibilities of waste sulfur valorization in eco-friendly products. in XII Simpozijum sa međunarodnim učešćem „Rudarstvo 2021“
Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina., 84-101.

Martinović S, Vlahović M, Đorđević N. Possibilities of waste sulfur valorization in eco-friendly products. in XII Simpozijum sa međunarodnim učešćem „Rudarstvo 2021“. 2021;:84-101..

Martinović, Sanja, Vlahović, Milica, Đorđević, Nataša, "Possibilities of waste sulfur valorization in eco-friendly products" in XII Simpozijum sa međunarodnim učešćem „Rudarstvo 2021“ (2021):84-101.

TY  - CONF
AU  - Vlahović, Milica
AU  - Savić, Aleksandar
AU  - Martinović, Sanja
AU  - Đorđević, Nataša
AU  - Stević, Zoran
AU  - Volkov Husović, Tatjana
PY  - 2020
UR  - https://ritnms.itnms.ac.rs/handle/123456789/813
AB  - Electric power in Serbia is predominantly provided by thermal power plants. All of eleven existing
thermal power plants in Serbia use coal, mainly lignite in the electricity production process
thus generating about 6 million tons of fly ash per year. The estimated amount of fly ash from thermal
power plants accumulated in Serbian landfills exceeds 200 million tons. On the other hand, during
the last decades, respecting the principles of ecologically sustainable development has been imposed
on industries, and one of them is the construction industry. Due to the presence of amorphous SiO2
and Al2O3, fly ash as pozzolanic material is convenient for the production of concrete and mortar.
Consequently, multiple positive effects can be expected by the proper consumption of fly ash- reducing
landfills and improving concrete properties. The idea of this study is to analyze the possibility of
recycling fly ash from a thermal power plant by replacing a part of common mineral filler- limestone
in the production of self-compacting concrete (SCC). Properties of conventional SCC with limestone
and compositions with different fly ash content were compared. Considering that requirements for SCC should be satisfied and all properties remain or enhance in the case of fly ash addition, this
study proved that all designed concretes can be used for structural applications.
AB  - Električnu energiju u Srbiji pretežno obezbeđuju termoelektrane. Svih jedanaest termoelektrana
u Srbiji koriste ugalj, uglavnom lignit u procesu proizvodnje električne energije, čime se
godišnje generiše oko 6 miliona tona letećeg pepela. Procenjena količina letećeg pepela iz termoelektrana
akumulirana na deponijama u Srbiji prelazi 200 miliona tona. S druge strane, poslednjih
decenija poštovanje principa ekološki održivog razvoja nametnuto je industrijama, a jedna od njih je
i građevinska. Zahvaljujući prisustvu amorfnog SiO2 i Al2O3, pepeo kao pucolanski materijal pogodan
je za proizvodnju betona i maltera. Zbog toga se pravilnom upotrebom letećeg pepela mogu
očekivati višestruki pozitivni efekti- smanjenje deponija i poboljšanje svojstava betona. Ideja ovog
istraživanja je analiziranje mogućnosti recikliranja letećeg pepela iz termoelektrane tako što će delimično
zameniti uobičajeni mineralni punioc- krečnjak u proizvodnji samozbijajućeg betona (SCC).
Upoređena su svojstva konvencionalnog SCC sa krečnjakom i kompozicija sa različitim sadržajem
pepela. S obzirom da je u slučaju dodatka letećeg pepela potrebno da budu zadovoljeni zahtevi za
SCC, kao i da svojstva betona ostanu ista ili poboljšana, ova studija je pokazala da se sve dizajnirane
smeše mogu koristiti za konstrukcijske primene.
PB  - Belgrade : Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) Society for Renewable Electrical Power Sources
C3  - 8th International Conference on Renewable Electrical Power Sources
T1  - Enhancing properties of concrete by addition of fly ash from a thermal power plant for application in geothermal systems
EP  - 86
SP  - 77
ER  - 

@conference{
author = "Vlahović, Milica and Savić, Aleksandar and Martinović, Sanja and Đorđević, Nataša and Stević, Zoran and Volkov Husović, Tatjana",
year = "2020",
abstract = "Electric power in Serbia is predominantly provided by thermal power plants. All of eleven existing
thermal power plants in Serbia use coal, mainly lignite in the electricity production process
thus generating about 6 million tons of fly ash per year. The estimated amount of fly ash from thermal
power plants accumulated in Serbian landfills exceeds 200 million tons. On the other hand, during
the last decades, respecting the principles of ecologically sustainable development has been imposed
on industries, and one of them is the construction industry. Due to the presence of amorphous SiO2
and Al2O3, fly ash as pozzolanic material is convenient for the production of concrete and mortar.
Consequently, multiple positive effects can be expected by the proper consumption of fly ash- reducing
landfills and improving concrete properties. The idea of this study is to analyze the possibility of
recycling fly ash from a thermal power plant by replacing a part of common mineral filler- limestone
in the production of self-compacting concrete (SCC). Properties of conventional SCC with limestone
and compositions with different fly ash content were compared. Considering that requirements for SCC should be satisfied and all properties remain or enhance in the case of fly ash addition, this
study proved that all designed concretes can be used for structural applications., Električnu energiju u Srbiji pretežno obezbeđuju termoelektrane. Svih jedanaest termoelektrana
u Srbiji koriste ugalj, uglavnom lignit u procesu proizvodnje električne energije, čime se
godišnje generiše oko 6 miliona tona letećeg pepela. Procenjena količina letećeg pepela iz termoelektrana
akumulirana na deponijama u Srbiji prelazi 200 miliona tona. S druge strane, poslednjih
decenija poštovanje principa ekološki održivog razvoja nametnuto je industrijama, a jedna od njih je
i građevinska. Zahvaljujući prisustvu amorfnog SiO2 i Al2O3, pepeo kao pucolanski materijal pogodan
je za proizvodnju betona i maltera. Zbog toga se pravilnom upotrebom letećeg pepela mogu
očekivati višestruki pozitivni efekti- smanjenje deponija i poboljšanje svojstava betona. Ideja ovog
istraživanja je analiziranje mogućnosti recikliranja letećeg pepela iz termoelektrane tako što će delimično
zameniti uobičajeni mineralni punioc- krečnjak u proizvodnji samozbijajućeg betona (SCC).
Upoređena su svojstva konvencionalnog SCC sa krečnjakom i kompozicija sa različitim sadržajem
pepela. S obzirom da je u slučaju dodatka letećeg pepela potrebno da budu zadovoljeni zahtevi za
SCC, kao i da svojstva betona ostanu ista ili poboljšana, ova studija je pokazala da se sve dizajnirane
smeše mogu koristiti za konstrukcijske primene.",
publisher = "Belgrade : Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) Society for Renewable Electrical Power Sources",
journal = "8th International Conference on Renewable Electrical Power Sources",
title = "Enhancing properties of concrete by addition of fly ash from a thermal power plant for application in geothermal systems",
pages = "86-77"
}

Vlahović, M., Savić, A., Martinović, S., Đorđević, N., Stević, Z.,& Volkov Husović, T.. (2020). Enhancing properties of concrete by addition of fly ash from a thermal power plant for application in geothermal systems. in 8th International Conference on Renewable Electrical Power Sources
Belgrade : Union of Mechanical and Electrotechnical Engineers and Technicians of Serbia (SMEITS) Society for Renewable Electrical Power Sources., 77-86.

Vlahović M, Savić A, Martinović S, Đorđević N, Stević Z, Volkov Husović T. Enhancing properties of concrete by addition of fly ash from a thermal power plant for application in geothermal systems. in 8th International Conference on Renewable Electrical Power Sources. 2020;:77-86..

Vlahović, Milica, Savić, Aleksandar, Martinović, Sanja, Đorđević, Nataša, Stević, Zoran, Volkov Husović, Tatjana, "Enhancing properties of concrete by addition of fly ash from a thermal power plant for application in geothermal systems" in 8th International Conference on Renewable Electrical Power Sources (2020):77-86.