TY  - JOUR
AU  - Bojović, Dragan
AU  - Terzić, Anja
AU  - Nikolić, Dragan
AU  - Janković, Ksenija
PY  - 2023
UR  - http://rims.institutims.rs/handle/123456789/503
AB  - The experimental study included the design and production of ultra-high-performance steel fiber-reinforced concrete (UHPFRC). The physical and mechanical properties of UHPFRC were investigated in a laboratory setting. To investigate the properties of UHPFR concrete, three types of concrete and over 70 samples were used. Following that, samples were created to test the anchors' load-bearing performance. Six concrete slabs with a total of 108 pre-installed anchor samples and six concrete slabs with 108 post-installed chemical anchor samples were created. The analysis of the test findings comprised all individual results as well as the definition of the relationship between the anchor's tensile load capacity and other parameters. To accurately determine the individual influence of the investigated factors as well as their combined impact, a factorial experiment, and artificial neural networks were used in addition to normal statistical numerical studies. It was determined that both approaches offer advantages. The results obtained show matches in certain parts. Due to the way data is processed in different ways, there are also significant differences between them.
T2  - Science of Sintering 2023 OnLine-First Issue 00
T1  - Determination of the effects of the rebar-cement bond parameters variation in UHPFRC using FA and ANN
DO  - 10.2298/SOS230420029B
ER  - 

@article{
author = "Bojović, Dragan and Terzić, Anja and Nikolić, Dragan and Janković, Ksenija",
year = "2023",
abstract = "The experimental study included the design and production of ultra-high-performance steel fiber-reinforced concrete (UHPFRC). The physical and mechanical properties of UHPFRC were investigated in a laboratory setting. To investigate the properties of UHPFR concrete, three types of concrete and over 70 samples were used. Following that, samples were created to test the anchors' load-bearing performance. Six concrete slabs with a total of 108 pre-installed anchor samples and six concrete slabs with 108 post-installed chemical anchor samples were created. The analysis of the test findings comprised all individual results as well as the definition of the relationship between the anchor's tensile load capacity and other parameters. To accurately determine the individual influence of the investigated factors as well as their combined impact, a factorial experiment, and artificial neural networks were used in addition to normal statistical numerical studies. It was determined that both approaches offer advantages. The results obtained show matches in certain parts. Due to the way data is processed in different ways, there are also significant differences between them.",
journal = "Science of Sintering 2023 OnLine-First Issue 00",
title = "Determination of the effects of the rebar-cement bond parameters variation in UHPFRC using FA and ANN",
doi = "10.2298/SOS230420029B"
}

Bojović, D., Terzić, A., Nikolić, D.,& Janković, K.. (2023). Determination of the effects of the rebar-cement bond parameters variation in UHPFRC using FA and ANN. in Science of Sintering 2023 OnLine-First Issue 00.
https://doi.org/10.2298/SOS230420029B

Bojović D, Terzić A, Nikolić D, Janković K. Determination of the effects of the rebar-cement bond parameters variation in UHPFRC using FA and ANN. in Science of Sintering 2023 OnLine-First Issue 00. 2023;.
doi:10.2298/SOS230420029B .

Bojović, Dragan, Terzić, Anja, Nikolić, Dragan, Janković, Ksenija, "Determination of the effects of the rebar-cement bond parameters variation in UHPFRC using FA and ANN" in Science of Sintering 2023 OnLine-First Issue 00 (2023),
https://doi.org/10.2298/SOS230420029B . .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Nikolić, Dragan
AU  - Miličić, Ljiljana
AU  - Bojović, Dragan
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/213
AB  - Metakaolin composite cements were prepared with 5 to 35 % replacement of ordinary Portland cement with metakaolin (MK), manufactured by thermal activation/calcination of domestic kaolin clay, and commercial matakaolin (CMK). Performance of the composite cements was evaluated through the setting time (initial and final), compressive strengths (for ages 2, 7, 28, 90 and 180 days) and soundness, and compared with control cement (Portland cement - CEM I). After 28 days, compressive strength was higher than that for control cement for cements prepared with addition of CMK, and with addition of up to 25 % MK.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnicki Vjesnik-Technical Gazette
T1  - Properties of composite cement with commercial and manufactured metakaolin
EP  - 687
IS  - 4
SP  - 683
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_rims_213
ER  - 

@article{
author = "Mitrović, Aleksandra and Nikolić, Dragan and Miličić, Ljiljana and Bojović, Dragan",
year = "2013",
abstract = "Metakaolin composite cements were prepared with 5 to 35 % replacement of ordinary Portland cement with metakaolin (MK), manufactured by thermal activation/calcination of domestic kaolin clay, and commercial matakaolin (CMK). Performance of the composite cements was evaluated through the setting time (initial and final), compressive strengths (for ages 2, 7, 28, 90 and 180 days) and soundness, and compared with control cement (Portland cement - CEM I). After 28 days, compressive strength was higher than that for control cement for cements prepared with addition of CMK, and with addition of up to 25 % MK.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnicki Vjesnik-Technical Gazette",
title = "Properties of composite cement with commercial and manufactured metakaolin",
pages = "687-683",
number = "4",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_rims_213"
}

Mitrović, A., Nikolić, D., Miličić, L.,& Bojović, D.. (2013). Properties of composite cement with commercial and manufactured metakaolin. in Tehnicki Vjesnik-Technical Gazette
Univ Osijek, Tech Fac, Slavonski Brod., 20(4), 683-687.
https://hdl.handle.net/21.15107/rcub_rims_213

Mitrović A, Nikolić D, Miličić L, Bojović D. Properties of composite cement with commercial and manufactured metakaolin. in Tehnicki Vjesnik-Technical Gazette. 2013;20(4):683-687.
https://hdl.handle.net/21.15107/rcub_rims_213 .

Mitrović, Aleksandra, Nikolić, Dragan, Miličić, Ljiljana, Bojović, Dragan, "Properties of composite cement with commercial and manufactured metakaolin" in Tehnicki Vjesnik-Technical Gazette, 20, no. 4 (2013):683-687,
https://hdl.handle.net/21.15107/rcub_rims_213 .

TY  - JOUR
AU  - Bojović, Dragan
AU  - Nikolić, Dragan
AU  - Janković, Ksenija
AU  - Lončar, Ljiljana
PY  - 2012
UR  - http://rims.institutims.rs/handle/123456789/156
AB  - Mnogi parametri utiču na karakteristike svežeg i očvrslog betona. Jedan od najvažnijih svakako jeste poroznost betona. Poroznost svežeg betona meri se količinom uvučenog vazduha. Uticaj uvučenog vazduha na beton i njegovu pritisnu čvrstoću istraživali su mnogi svetski istraživači. Na bazi tih istraživanja, izdvojene su dve, u praksi najviše korišćene, formule. Tehnike mekog programiranja, a posebno neuronske mreže, s formiranim bazama podataka laboratorijskih ispitivanja betona, otvaraju novi pristup u predviđanju uticaja količine uvučenog vazduha u svežem betonu na njegovu čvrstoću pri pritisku.
AB  - Many parameters influence on the characteristics of fresh and hardened concrete. One of the most important characteristic of concrete is its porosity. Measure the porosity of fresh concrete is measured by the amount of entrained air. The effect of entrained air in concrete on compressive strength investigated by many authors. On the bases these works we have two formulas applicable in practice. Soft programming techniques especialy neural networks and the formation of databases related to the testing in laboratories for concrete opened up new approaches in predicting the impact of the quantity of entrained air in concrete on compressive strength.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Građevinski materijali i konstrukcije
T1  - Evaluation of air content on concrete compressive strength with classical approach and neural networks
EP  - 54
IS  - 1
SP  - 47
VL  - 55
UR  - https://hdl.handle.net/21.15107/rcub_rims_156
ER  - 

@article{
author = "Bojović, Dragan and Nikolić, Dragan and Janković, Ksenija and Lončar, Ljiljana",
year = "2012",
abstract = "Mnogi parametri utiču na karakteristike svežeg i očvrslog betona. Jedan od najvažnijih svakako jeste poroznost betona. Poroznost svežeg betona meri se količinom uvučenog vazduha. Uticaj uvučenog vazduha na beton i njegovu pritisnu čvrstoću istraživali su mnogi svetski istraživači. Na bazi tih istraživanja, izdvojene su dve, u praksi najviše korišćene, formule. Tehnike mekog programiranja, a posebno neuronske mreže, s formiranim bazama podataka laboratorijskih ispitivanja betona, otvaraju novi pristup u predviđanju uticaja količine uvučenog vazduha u svežem betonu na njegovu čvrstoću pri pritisku., Many parameters influence on the characteristics of fresh and hardened concrete. One of the most important characteristic of concrete is its porosity. Measure the porosity of fresh concrete is measured by the amount of entrained air. The effect of entrained air in concrete on compressive strength investigated by many authors. On the bases these works we have two formulas applicable in practice. Soft programming techniques especialy neural networks and the formation of databases related to the testing in laboratories for concrete opened up new approaches in predicting the impact of the quantity of entrained air in concrete on compressive strength.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Građevinski materijali i konstrukcije",
title = "Evaluation of air content on concrete compressive strength with classical approach and neural networks",
pages = "54-47",
number = "1",
volume = "55",
url = "https://hdl.handle.net/21.15107/rcub_rims_156"
}

Bojović, D., Nikolić, D., Janković, K.,& Lončar, L.. (2012). Evaluation of air content on concrete compressive strength with classical approach and neural networks. in Građevinski materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 55(1), 47-54.
https://hdl.handle.net/21.15107/rcub_rims_156

Bojović D, Nikolić D, Janković K, Lončar L. Evaluation of air content on concrete compressive strength with classical approach and neural networks. in Građevinski materijali i konstrukcije. 2012;55(1):47-54.
https://hdl.handle.net/21.15107/rcub_rims_156 .

Bojović, Dragan, Nikolić, Dragan, Janković, Ksenija, Lončar, Ljiljana, "Evaluation of air content on concrete compressive strength with classical approach and neural networks" in Građevinski materijali i konstrukcije, 55, no. 1 (2012):47-54,
https://hdl.handle.net/21.15107/rcub_rims_156 .

TY  - CONF
AU  - Nikolić, Dragan
AU  - Bojović, Dragan
AU  - Janković, Ksenija
AU  - Lončar, Ljiljana
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/154
AB  - The mechanical properties (compressive strength and flexural strength) were investigated under different curing conditions (standard and steam curing). Silica fumes have characteristics that make them necessary in cement composites with ultra strength properties. The search for substitute products thus appears important if the use of ultra high performance concrete (UHPC) is to become more widespread in the concrete industry. Possibilities of getting ultra high performance self compacting concrete (UHPSCC) with materials available in Serbia, based on experimental work are discussed in this paper. Four series of samples were made with different types of fine reactive additives (silica fume in referent concrete was replaced with metakaolin at 20% and 40% and with fine fly ash at 20%.). The produced mixes had self compacted consistency. The compressive strength varied between 145 and 180 MPa for the steam cered specimens and between 180 and 205 MPa for the ones that had not been heat treated. Furthermore, this paper presents SEM micrographs of C-S-H phase formed after steam curing and autoclaving.
PB  - Czech Concrete Soc-Ceska Betonarska Spolecnost Cssi, Prague 1
C3  - FIB Symposium Prague 2011: Concrete Engineering for Excellence and Efficiency, Vols 1 and 2
T1  - Mix design and engineering properties of ultra high performance self compacting concrete
EP  - 356
SP  - 353
UR  - https://hdl.handle.net/21.15107/rcub_rims_154
ER  - 

@conference{
author = "Nikolić, Dragan and Bojović, Dragan and Janković, Ksenija and Lončar, Ljiljana",
year = "2011",
abstract = "The mechanical properties (compressive strength and flexural strength) were investigated under different curing conditions (standard and steam curing). Silica fumes have characteristics that make them necessary in cement composites with ultra strength properties. The search for substitute products thus appears important if the use of ultra high performance concrete (UHPC) is to become more widespread in the concrete industry. Possibilities of getting ultra high performance self compacting concrete (UHPSCC) with materials available in Serbia, based on experimental work are discussed in this paper. Four series of samples were made with different types of fine reactive additives (silica fume in referent concrete was replaced with metakaolin at 20% and 40% and with fine fly ash at 20%.). The produced mixes had self compacted consistency. The compressive strength varied between 145 and 180 MPa for the steam cered specimens and between 180 and 205 MPa for the ones that had not been heat treated. Furthermore, this paper presents SEM micrographs of C-S-H phase formed after steam curing and autoclaving.",
publisher = "Czech Concrete Soc-Ceska Betonarska Spolecnost Cssi, Prague 1",
journal = "FIB Symposium Prague 2011: Concrete Engineering for Excellence and Efficiency, Vols 1 and 2",
title = "Mix design and engineering properties of ultra high performance self compacting concrete",
pages = "356-353",
url = "https://hdl.handle.net/21.15107/rcub_rims_154"
}

Nikolić, D., Bojović, D., Janković, K.,& Lončar, L.. (2011). Mix design and engineering properties of ultra high performance self compacting concrete. in FIB Symposium Prague 2011: Concrete Engineering for Excellence and Efficiency, Vols 1 and 2
Czech Concrete Soc-Ceska Betonarska Spolecnost Cssi, Prague 1., 353-356.
https://hdl.handle.net/21.15107/rcub_rims_154

Nikolić D, Bojović D, Janković K, Lončar L. Mix design and engineering properties of ultra high performance self compacting concrete. in FIB Symposium Prague 2011: Concrete Engineering for Excellence and Efficiency, Vols 1 and 2. 2011;:353-356.
https://hdl.handle.net/21.15107/rcub_rims_154 .

Nikolić, Dragan, Bojović, Dragan, Janković, Ksenija, Lončar, Ljiljana, "Mix design and engineering properties of ultra high performance self compacting concrete" in FIB Symposium Prague 2011: Concrete Engineering for Excellence and Efficiency, Vols 1 and 2 (2011):353-356,
https://hdl.handle.net/21.15107/rcub_rims_154 .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Stanković, Srboljub J.
AU  - Nikolić, Dragan
AU  - Bojović, Dragan
AU  - Lončar, Ljiljana
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/153
AB  - The evaluation of the dynamic modulus of elasticity of twelve different concrete mix proportions as a function of the density and degradations due to freeze/thaw cycles is presented in this paper. Pore system and saturation are the main factors for concrete freeze-thaw resistance. The frequency analysis of ultrasonic waves in concrete after every 25 cycles was done. Dynamic modulus of elasticity was determination by resonance frequency analysis. This parameter is 35-50% smaller for concrete with recycled bricks as aggregate than ordinary concrete. For all concrete mixes dynamic and static (measured by destructive testing) modules of elasticity were compared.
T2  - Revista Romana de Materiale/ Romanian Journal of Materials
T1  - Determination of recycled aggregate concrete degradation by resonance frequency analysis
EP  - 25
IS  - 1
SP  - 22
VL  - 41
UR  - https://hdl.handle.net/21.15107/rcub_vinar_4253
ER  - 

@article{
author = "Janković, Ksenija and Stanković, Srboljub J. and Nikolić, Dragan and Bojović, Dragan and Lončar, Ljiljana",
year = "2011",
abstract = "The evaluation of the dynamic modulus of elasticity of twelve different concrete mix proportions as a function of the density and degradations due to freeze/thaw cycles is presented in this paper. Pore system and saturation are the main factors for concrete freeze-thaw resistance. The frequency analysis of ultrasonic waves in concrete after every 25 cycles was done. Dynamic modulus of elasticity was determination by resonance frequency analysis. This parameter is 35-50% smaller for concrete with recycled bricks as aggregate than ordinary concrete. For all concrete mixes dynamic and static (measured by destructive testing) modules of elasticity were compared.",
journal = "Revista Romana de Materiale/ Romanian Journal of Materials",
title = "Determination of recycled aggregate concrete degradation by resonance frequency analysis",
pages = "25-22",
number = "1",
volume = "41",
url = "https://hdl.handle.net/21.15107/rcub_vinar_4253"
}

Janković, K., Stanković, S. J., Nikolić, D., Bojović, D.,& Lončar, L.. (2011). Determination of recycled aggregate concrete degradation by resonance frequency analysis. in Revista Romana de Materiale/ Romanian Journal of Materials, 41(1), 22-25.
https://hdl.handle.net/21.15107/rcub_vinar_4253

Janković K, Stanković SJ, Nikolić D, Bojović D, Lončar L. Determination of recycled aggregate concrete degradation by resonance frequency analysis. in Revista Romana de Materiale/ Romanian Journal of Materials. 2011;41(1):22-25.
https://hdl.handle.net/21.15107/rcub_vinar_4253 .

Janković, Ksenija, Stanković, Srboljub J., Nikolić, Dragan, Bojović, Dragan, Lončar, Ljiljana, "Determination of recycled aggregate concrete degradation by resonance frequency analysis" in Revista Romana de Materiale/ Romanian Journal of Materials, 41, no. 1 (2011):22-25,
https://hdl.handle.net/21.15107/rcub_vinar_4253 .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Cirović, Goran
AU  - Nikolić, Dragan
AU  - Bojović, Dragan
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/149
AB  - Preparation and microstructure of ultra high performance concrete (UHPC) have been intensively analyzed In the last few years. The mechanical properties (compressive strength and flexural strength) were investigated under different curing conditions (standard and steam curing). Silica fumes have characteristics that make them necessary in cement composites with ultra strength properties. The search for substitute products thus appears important if the use of UHPC is to become more widespread in the concrete industry. Possibilities of making ultra high performance self compacting concrete (UHPSCC) with materials available in Serbia, based on experimental work are discussed in this paper. Three series of samples were made with different types of fine reactive additives (silica fume was replaced with metakaolin at 20% and 40% and with fine fly ash at 20%). The produced mixes had self compacted consistency. The 28(th) day compressive strength varied between 165 and 195 MPa for the heat treated specimens and between 135 and 150 MPa for the ones that had not been heat treated. Furthermore, this paper presents SEM micrographs of C-S-H phase formed after steam curing and super-heated steam under preassure.
T2  - Revista Romana de Materiale/ Romanian Journal of Materials
T1  - Mechanical properties of ultra high performance self compacting concrete with different mineral admixtures
EP  - 218
IS  - 3
SP  - 211
VL  - 41
UR  - https://hdl.handle.net/21.15107/rcub_rims_149
ER  - 

@article{
author = "Janković, Ksenija and Cirović, Goran and Nikolić, Dragan and Bojović, Dragan",
year = "2011",
abstract = "Preparation and microstructure of ultra high performance concrete (UHPC) have been intensively analyzed In the last few years. The mechanical properties (compressive strength and flexural strength) were investigated under different curing conditions (standard and steam curing). Silica fumes have characteristics that make them necessary in cement composites with ultra strength properties. The search for substitute products thus appears important if the use of UHPC is to become more widespread in the concrete industry. Possibilities of making ultra high performance self compacting concrete (UHPSCC) with materials available in Serbia, based on experimental work are discussed in this paper. Three series of samples were made with different types of fine reactive additives (silica fume was replaced with metakaolin at 20% and 40% and with fine fly ash at 20%). The produced mixes had self compacted consistency. The 28(th) day compressive strength varied between 165 and 195 MPa for the heat treated specimens and between 135 and 150 MPa for the ones that had not been heat treated. Furthermore, this paper presents SEM micrographs of C-S-H phase formed after steam curing and super-heated steam under preassure.",
journal = "Revista Romana de Materiale/ Romanian Journal of Materials",
title = "Mechanical properties of ultra high performance self compacting concrete with different mineral admixtures",
pages = "218-211",
number = "3",
volume = "41",
url = "https://hdl.handle.net/21.15107/rcub_rims_149"
}

Janković, K., Cirović, G., Nikolić, D.,& Bojović, D.. (2011). Mechanical properties of ultra high performance self compacting concrete with different mineral admixtures. in Revista Romana de Materiale/ Romanian Journal of Materials, 41(3), 211-218.
https://hdl.handle.net/21.15107/rcub_rims_149

Janković K, Cirović G, Nikolić D, Bojović D. Mechanical properties of ultra high performance self compacting concrete with different mineral admixtures. in Revista Romana de Materiale/ Romanian Journal of Materials. 2011;41(3):211-218.
https://hdl.handle.net/21.15107/rcub_rims_149 .

Janković, Ksenija, Cirović, Goran, Nikolić, Dragan, Bojović, Dragan, "Mechanical properties of ultra high performance self compacting concrete with different mineral admixtures" in Revista Romana de Materiale/ Romanian Journal of Materials, 41, no. 3 (2011):211-218,
https://hdl.handle.net/21.15107/rcub_rims_149 .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Nikolić, Dragan
AU  - Bojović, Dragan
AU  - Lončar, Ljiljana
AU  - Romakov, Zoran
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/132
AB  - Procena čvrstoće pri pritisku se postavlja kao važan zadatak proizvođačima betona, naročito pri projektovanju betonskih mešavina i obezbeđenju zahtevanog kvaliteta proizvedenog betona. U radu je prikazano poređenje eksperimentalnih rezultata čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom sa rezultatima dobijenim na osnovu jednačina prikazanih u tehničkoj regulativi. Prikazan je koeficijent determinacije eksperimentalnih podataka i rezultata dobijenih na osnovu preračuna prema jednačinama datim u EN 1992-1-1, ACI 209 i tabeli za preračun datoj u SRPS U.M1.048. Prikaz zavisnosti čvrstoće pri pritisku betona na osnovu jednačina datih u radu se odnosi na određivanje zavisnosti u odnosu na vrstu upotrebljenog cementa i starosti betona negovanog na konstantnoj temperaturi.
AB  - Estimation of concrete strength is an important issue in ready-mixed concrete industry, especially, in proportioning new mixtures and for the quality assurance of the concrete produced. In this article, on the basis of the existing experimental data of compressive strength of normal and recycled aggregate concrete and equation for compressive strength calculating given in Technical regulation are compared. The accuracies of prediction by experimental data obtained in laboratory as well as by EN 1992-1-1, ACI 209 and SRPS U.M1.048 are compared on the basis of the coefficient of determination. The determination of the compressive strengths by the equation described here relies on determination of type of cement and age of concrete with the constant curing temperature.
PB  - Univerzitet u Nišu, Niš
T2  - Facta universitatis - series: Architecture and Civil Engineering
T1  - Procena čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom
T1  - The estimation of compressive strength of normal and recycled aggregate concrete
EP  - 431
IS  - 3
SP  - 419
VL  - 9
DO  - 10.2298/FUACE1103419J
ER  - 

@article{
author = "Janković, Ksenija and Nikolić, Dragan and Bojović, Dragan and Lončar, Ljiljana and Romakov, Zoran",
year = "2011",
abstract = "Procena čvrstoće pri pritisku se postavlja kao važan zadatak proizvođačima betona, naročito pri projektovanju betonskih mešavina i obezbeđenju zahtevanog kvaliteta proizvedenog betona. U radu je prikazano poređenje eksperimentalnih rezultata čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom sa rezultatima dobijenim na osnovu jednačina prikazanih u tehničkoj regulativi. Prikazan je koeficijent determinacije eksperimentalnih podataka i rezultata dobijenih na osnovu preračuna prema jednačinama datim u EN 1992-1-1, ACI 209 i tabeli za preračun datoj u SRPS U.M1.048. Prikaz zavisnosti čvrstoće pri pritisku betona na osnovu jednačina datih u radu se odnosi na određivanje zavisnosti u odnosu na vrstu upotrebljenog cementa i starosti betona negovanog na konstantnoj temperaturi., Estimation of concrete strength is an important issue in ready-mixed concrete industry, especially, in proportioning new mixtures and for the quality assurance of the concrete produced. In this article, on the basis of the existing experimental data of compressive strength of normal and recycled aggregate concrete and equation for compressive strength calculating given in Technical regulation are compared. The accuracies of prediction by experimental data obtained in laboratory as well as by EN 1992-1-1, ACI 209 and SRPS U.M1.048 are compared on the basis of the coefficient of determination. The determination of the compressive strengths by the equation described here relies on determination of type of cement and age of concrete with the constant curing temperature.",
publisher = "Univerzitet u Nišu, Niš",
journal = "Facta universitatis - series: Architecture and Civil Engineering",
title = "Procena čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom, The estimation of compressive strength of normal and recycled aggregate concrete",
pages = "431-419",
number = "3",
volume = "9",
doi = "10.2298/FUACE1103419J"
}

Janković, K., Nikolić, D., Bojović, D., Lončar, L.,& Romakov, Z.. (2011). Procena čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom. in Facta universitatis - series: Architecture and Civil Engineering
Univerzitet u Nišu, Niš., 9(3), 419-431.
https://doi.org/10.2298/FUACE1103419J

Janković K, Nikolić D, Bojović D, Lončar L, Romakov Z. Procena čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom. in Facta universitatis - series: Architecture and Civil Engineering. 2011;9(3):419-431.
doi:10.2298/FUACE1103419J .

Janković, Ksenija, Nikolić, Dragan, Bojović, Dragan, Lončar, Ljiljana, Romakov, Zoran, "Procena čvrstoće pri pritisku betona sa prirodnim i recikliranim agregatom" in Facta universitatis - series: Architecture and Civil Engineering, 9, no. 3 (2011):419-431,
https://doi.org/10.2298/FUACE1103419J . .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Bojović, Dragan
AU  - Nikolić, Dragan
AU  - Lončar, Ljiljana
AU  - Romakov, Zoran
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/128
AB  - Predmet istraživanja su betoni spravljeni sa recikliranom opekom kao agregatom. Eksperimentalni rad je obuhvatio više vrsta betona spravljenih sa istom količinom cementa (385 kg/m3) i istom konzistencijom (sleganje oko 1 cm). Kao agregat je korišćena reciklirana opeka i kombinacija reciklirane opeke i prirodnog rečnog agregata. Posmatran je uticaj upotrebljenih frakcija drobljene opeke i njihovog procentualnog učešća na čvrstoću pri pritisku, upijanje vode i otpornost prema dejstvu mraza. Na osnovu rezultata eksperimentalnih istraživanja može se zaključiti da se primenom reciklirane opeke kao agregata dobija novi kompozitni materijal sa zadovoljavajućim fizičko - mehaničkim karakteristikama.
AB  - The investigation included concrete made by using recycled brick as aggregate. Experimental work included several types of concrete made with the same cement content (385 kg/m3), and same consistency (slump about 1 cm). Recycled brick and combination of natural river aggregate and recycled brick were used as aggregates. The influence of percentage and grain size of crushed brick aggregate on concrete compressive strength, water absorption and frost resistance were observed. On the basis of the results obtained during experimental research, a general conclusion can be drawn that the application of recycled concrete as aggregate can lead to new composites with satisfactory physical-mechanical properties.
PB  - Univerzitet u Nišu, Niš
T2  - Facta universitatis - series: Architecture and Civil Engineering
T1  - Otpornost prema dejstvu mraza betona sa agregatom od drobljene opeke
T1  - Frost resistance of concrete with crushed brick as aggregate
EP  - 162
IS  - 2
SP  - 155
VL  - 8
DO  - 10.2298/FUACE1002155J
ER  - 

@article{
author = "Janković, Ksenija and Bojović, Dragan and Nikolić, Dragan and Lončar, Ljiljana and Romakov, Zoran",
year = "2010",
abstract = "Predmet istraživanja su betoni spravljeni sa recikliranom opekom kao agregatom. Eksperimentalni rad je obuhvatio više vrsta betona spravljenih sa istom količinom cementa (385 kg/m3) i istom konzistencijom (sleganje oko 1 cm). Kao agregat je korišćena reciklirana opeka i kombinacija reciklirane opeke i prirodnog rečnog agregata. Posmatran je uticaj upotrebljenih frakcija drobljene opeke i njihovog procentualnog učešća na čvrstoću pri pritisku, upijanje vode i otpornost prema dejstvu mraza. Na osnovu rezultata eksperimentalnih istraživanja može se zaključiti da se primenom reciklirane opeke kao agregata dobija novi kompozitni materijal sa zadovoljavajućim fizičko - mehaničkim karakteristikama., The investigation included concrete made by using recycled brick as aggregate. Experimental work included several types of concrete made with the same cement content (385 kg/m3), and same consistency (slump about 1 cm). Recycled brick and combination of natural river aggregate and recycled brick were used as aggregates. The influence of percentage and grain size of crushed brick aggregate on concrete compressive strength, water absorption and frost resistance were observed. On the basis of the results obtained during experimental research, a general conclusion can be drawn that the application of recycled concrete as aggregate can lead to new composites with satisfactory physical-mechanical properties.",
publisher = "Univerzitet u Nišu, Niš",
journal = "Facta universitatis - series: Architecture and Civil Engineering",
title = "Otpornost prema dejstvu mraza betona sa agregatom od drobljene opeke, Frost resistance of concrete with crushed brick as aggregate",
pages = "162-155",
number = "2",
volume = "8",
doi = "10.2298/FUACE1002155J"
}

Janković, K., Bojović, D., Nikolić, D., Lončar, L.,& Romakov, Z.. (2010). Otpornost prema dejstvu mraza betona sa agregatom od drobljene opeke. in Facta universitatis - series: Architecture and Civil Engineering
Univerzitet u Nišu, Niš., 8(2), 155-162.
https://doi.org/10.2298/FUACE1002155J

Janković K, Bojović D, Nikolić D, Lončar L, Romakov Z. Otpornost prema dejstvu mraza betona sa agregatom od drobljene opeke. in Facta universitatis - series: Architecture and Civil Engineering. 2010;8(2):155-162.
doi:10.2298/FUACE1002155J .

Janković, Ksenija, Bojović, Dragan, Nikolić, Dragan, Lončar, Ljiljana, Romakov, Zoran, "Otpornost prema dejstvu mraza betona sa agregatom od drobljene opeke" in Facta universitatis - series: Architecture and Civil Engineering, 8, no. 2 (2010):155-162,
https://doi.org/10.2298/FUACE1002155J . .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Bojović, Dragan
AU  - Nikolić, Dragan
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/124
AB  - By using crushed brick as aggregate, the structure of concrete can be effectively modeled and materials with very different physical-mechanical characteristics can be obtained. Determination of the influence of polymer admixture on some modified concrete properties is shown in this paper. Experimental work included several types of concrete made with different cement content (250 or 350 kg/m(3)), and same consistency (slump about 5 cm). Few types of concrete made with 4% admixture of polymer (dry material) by weight of cement. Recycled brick or combination of river sand and recycled brick were used as aggregates. Results of determination of concrete compressive and bending strength, modulus of elasticity, coefficient of thermal conductivity, resistance to freezing-thawing, water permeability, shrinkage and creep, and stress - strain diagram were observed.
T2  - Revista Romana de Materiale/ Romanian Journal of Materials
T1  - Some properties of concrete based on recycled bricks
EP  - 227
IS  - 3
SP  - 222
VL  - 40
UR  - https://hdl.handle.net/21.15107/rcub_rims_124
ER  - 

@article{
author = "Janković, Ksenija and Bojović, Dragan and Nikolić, Dragan",
year = "2010",
abstract = "By using crushed brick as aggregate, the structure of concrete can be effectively modeled and materials with very different physical-mechanical characteristics can be obtained. Determination of the influence of polymer admixture on some modified concrete properties is shown in this paper. Experimental work included several types of concrete made with different cement content (250 or 350 kg/m(3)), and same consistency (slump about 5 cm). Few types of concrete made with 4% admixture of polymer (dry material) by weight of cement. Recycled brick or combination of river sand and recycled brick were used as aggregates. Results of determination of concrete compressive and bending strength, modulus of elasticity, coefficient of thermal conductivity, resistance to freezing-thawing, water permeability, shrinkage and creep, and stress - strain diagram were observed.",
journal = "Revista Romana de Materiale/ Romanian Journal of Materials",
title = "Some properties of concrete based on recycled bricks",
pages = "227-222",
number = "3",
volume = "40",
url = "https://hdl.handle.net/21.15107/rcub_rims_124"
}

Janković, K., Bojović, D.,& Nikolić, D.. (2010). Some properties of concrete based on recycled bricks. in Revista Romana de Materiale/ Romanian Journal of Materials, 40(3), 222-227.
https://hdl.handle.net/21.15107/rcub_rims_124

Janković K, Bojović D, Nikolić D. Some properties of concrete based on recycled bricks. in Revista Romana de Materiale/ Romanian Journal of Materials. 2010;40(3):222-227.
https://hdl.handle.net/21.15107/rcub_rims_124 .

Janković, Ksenija, Bojović, Dragan, Nikolić, Dragan, "Some properties of concrete based on recycled bricks" in Revista Romana de Materiale/ Romanian Journal of Materials, 40, no. 3 (2010):222-227,
https://hdl.handle.net/21.15107/rcub_rims_124 .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Nikolić, Dragan
AU  - Bojović, Dragan
AU  - Lončar, Ljiljana
PY  - 2010
UR  - http://rims.institutims.rs/handle/123456789/120
AB  - Značajno mesto u primeni novih materijala u građevinarstvu zauzima upotreba betona ultra visokih čvrstoća. Struktura, svojstva i tehnologija izrade ove vrsta betona se intenzivno proučava poslednjih petnaest godina. U ovom radu je prikazana mogućnost dobijanja betona ultra visokih čvrstoća na osnovu eksperimentalnih istraživanja primenom komponentnih materijala dostupnih u Srbiji. Spravljene su tri serije uzoraka sa različitim vrstama cemenata. Korišćena su čelična vlakna dužine 8mm i poprečnog preseka 0.175mm. Prikazana su fizičko-mehanička svojstva betona ultra visokih čvrstoća i analizirana je mikrostruktura ovog kompozita.
AB  - Modern civil engineering is characterized with increased application of Ultra-high strength concrete (UHSC). Structure, properties and manufacturing technologies of UHSC are intensively analyzed in the last fifteen years. Possibilities of getting UHSC designed with the materials that are available in Serbian market, were tested in the experimental work; they are shown in this paper. Three series of samples were made with different types of cement. Steel fibers were used: length 8 mm, diameter 0.175 mm. Physical-mechanical properties of UHSC are presented and microstructure of concrete was observed, as well.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Materijali i konstrukcije
T1  - Neka svojstva betona ultra visokih čvrstoća
EP  - 51
IS  - 1
SP  - 43
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_rims_120
ER  - 

@article{
author = "Janković, Ksenija and Nikolić, Dragan and Bojović, Dragan and Lončar, Ljiljana",
year = "2010",
abstract = "Značajno mesto u primeni novih materijala u građevinarstvu zauzima upotreba betona ultra visokih čvrstoća. Struktura, svojstva i tehnologija izrade ove vrsta betona se intenzivno proučava poslednjih petnaest godina. U ovom radu je prikazana mogućnost dobijanja betona ultra visokih čvrstoća na osnovu eksperimentalnih istraživanja primenom komponentnih materijala dostupnih u Srbiji. Spravljene su tri serije uzoraka sa različitim vrstama cemenata. Korišćena su čelična vlakna dužine 8mm i poprečnog preseka 0.175mm. Prikazana su fizičko-mehanička svojstva betona ultra visokih čvrstoća i analizirana je mikrostruktura ovog kompozita., Modern civil engineering is characterized with increased application of Ultra-high strength concrete (UHSC). Structure, properties and manufacturing technologies of UHSC are intensively analyzed in the last fifteen years. Possibilities of getting UHSC designed with the materials that are available in Serbian market, were tested in the experimental work; they are shown in this paper. Three series of samples were made with different types of cement. Steel fibers were used: length 8 mm, diameter 0.175 mm. Physical-mechanical properties of UHSC are presented and microstructure of concrete was observed, as well.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Materijali i konstrukcije",
title = "Neka svojstva betona ultra visokih čvrstoća",
pages = "51-43",
number = "1",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_rims_120"
}

Janković, K., Nikolić, D., Bojović, D.,& Lončar, L.. (2010). Neka svojstva betona ultra visokih čvrstoća. in Materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 53(1), 43-51.
https://hdl.handle.net/21.15107/rcub_rims_120

Janković K, Nikolić D, Bojović D, Lončar L. Neka svojstva betona ultra visokih čvrstoća. in Materijali i konstrukcije. 2010;53(1):43-51.
https://hdl.handle.net/21.15107/rcub_rims_120 .

Janković, Ksenija, Nikolić, Dragan, Bojović, Dragan, Lončar, Ljiljana, "Neka svojstva betona ultra visokih čvrstoća" in Materijali i konstrukcije, 53, no. 1 (2010):43-51,
https://hdl.handle.net/21.15107/rcub_rims_120 .

TY  - JOUR
AU  - Janković, Ksenija
AU  - Bojović, Dragan
AU  - Lončar, Ljiljana
AU  - Kačarević, Zoran
AU  - Nikolić, Dragan
PY  - 2007
UR  - http://rims.institutims.rs/handle/123456789/65
AB  - Nove vrste betona u svetskoj praksi su u stalnoj upotrebi. Primena samozbijajućih betona u Srbiji je počela pre nekoliko godina. Za izgradnju Avalskog tornja koristiće se ova vrsta betona. Potrebe za dobrom završnom obradom, kratkim rokovima kao i nižom cenom izgradnje uputili su izvođača na primenu samozbijajućih betona.
AB  - In the world, new kinds of concrete are constantly being put to use. In the last few years we have made self-compacting concrete in Serbia. This kind of concrete will be use for construction of Avala tower. The contractor chose self-compacting concrete because of the need for excellent finishing, short deadlines and lower cost of building.
PB  - Univerzitet u Novom Sadu - Građevinski fakultet, Subotica
T2  - Zbornik radova Građevinskog fakulteta, Subotica
T1  - Projektovanje betonskih mešavina za izgradnju Avalskog tornja
T1  - Mix design of concrete for Avala tower
EP  - 120
IS  - 16
SP  - 115
UR  - https://hdl.handle.net/21.15107/rcub_rims_65
ER  - 

@article{
author = "Janković, Ksenija and Bojović, Dragan and Lončar, Ljiljana and Kačarević, Zoran and Nikolić, Dragan",
year = "2007",
abstract = "Nove vrste betona u svetskoj praksi su u stalnoj upotrebi. Primena samozbijajućih betona u Srbiji je počela pre nekoliko godina. Za izgradnju Avalskog tornja koristiće se ova vrsta betona. Potrebe za dobrom završnom obradom, kratkim rokovima kao i nižom cenom izgradnje uputili su izvođača na primenu samozbijajućih betona., In the world, new kinds of concrete are constantly being put to use. In the last few years we have made self-compacting concrete in Serbia. This kind of concrete will be use for construction of Avala tower. The contractor chose self-compacting concrete because of the need for excellent finishing, short deadlines and lower cost of building.",
publisher = "Univerzitet u Novom Sadu - Građevinski fakultet, Subotica",
journal = "Zbornik radova Građevinskog fakulteta, Subotica",
title = "Projektovanje betonskih mešavina za izgradnju Avalskog tornja, Mix design of concrete for Avala tower",
pages = "120-115",
number = "16",
url = "https://hdl.handle.net/21.15107/rcub_rims_65"
}

Janković, K., Bojović, D., Lončar, L., Kačarević, Z.,& Nikolić, D.. (2007). Projektovanje betonskih mešavina za izgradnju Avalskog tornja. in Zbornik radova Građevinskog fakulteta, Subotica
Univerzitet u Novom Sadu - Građevinski fakultet, Subotica.(16), 115-120.
https://hdl.handle.net/21.15107/rcub_rims_65

Janković K, Bojović D, Lončar L, Kačarević Z, Nikolić D. Projektovanje betonskih mešavina za izgradnju Avalskog tornja. in Zbornik radova Građevinskog fakulteta, Subotica. 2007;(16):115-120.
https://hdl.handle.net/21.15107/rcub_rims_65 .

Janković, Ksenija, Bojović, Dragan, Lončar, Ljiljana, Kačarević, Zoran, Nikolić, Dragan, "Projektovanje betonskih mešavina za izgradnju Avalskog tornja" in Zbornik radova Građevinskog fakulteta, Subotica, no. 16 (2007):115-120,
https://hdl.handle.net/21.15107/rcub_rims_65 .