TY  - JOUR
AU  - Radević, Aleksandar
AU  - Despotović, Iva
AU  - Zakić, Dimitrije
AU  - Orešković, Marko
AU  - Jevtić, Dragica
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/962
AB  - Recycled concrete aggregate (RCA), obtained by crushing of original (old) concrete, consists of natural aggregate grains and a cement mortar matrix. The presence of old adhered cement mortar, which has higher porosity than natural aggregate, causes unfavourable properties of RCA. The research conducted in order to improve the quality of RCA and to enable its greater application in the construction industry is presented in this paper. Therefore, RCA was subjected to quality improvement treatments with hydrochloric acid and carbon dioxide (accelerated carbonation). The first procedure was aimed at partially removing the adhered cement mortar and the second at reinforcing the cement matrix. The physical, mechanical and chemical properties of all three types of RCA were tested. After the pre-soaking acid treatment (0.1 mol/dm(3) HCl), RCA showed reduced water absorption (up to 3%); the process of accelerated carbonation also led to reduced water absorption (13-20%) as well as to improved mechanical properties (similar to 10%). A scanning electron microscopy investigation revealed that the carbonation process, as expected, significantly reduces porosity of RCA. The overall results show that if RCA is obtained by crushing of compact, high-quality concrete, the procedures of aggregate quality improvement are not necessary.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Influence of acid treatment and carbonation on the properties of recycled concrete aggregate
EP  - 30
IS  - 1
SP  - 23
VL  - 24
DO  - 10.2298/CICEQ161202014R
ER  - 

@article{
author = "Radević, Aleksandar and Despotović, Iva and Zakić, Dimitrije and Orešković, Marko and Jevtić, Dragica",
year = "2018",
abstract = "Recycled concrete aggregate (RCA), obtained by crushing of original (old) concrete, consists of natural aggregate grains and a cement mortar matrix. The presence of old adhered cement mortar, which has higher porosity than natural aggregate, causes unfavourable properties of RCA. The research conducted in order to improve the quality of RCA and to enable its greater application in the construction industry is presented in this paper. Therefore, RCA was subjected to quality improvement treatments with hydrochloric acid and carbon dioxide (accelerated carbonation). The first procedure was aimed at partially removing the adhered cement mortar and the second at reinforcing the cement matrix. The physical, mechanical and chemical properties of all three types of RCA were tested. After the pre-soaking acid treatment (0.1 mol/dm(3) HCl), RCA showed reduced water absorption (up to 3%); the process of accelerated carbonation also led to reduced water absorption (13-20%) as well as to improved mechanical properties (similar to 10%). A scanning electron microscopy investigation revealed that the carbonation process, as expected, significantly reduces porosity of RCA. The overall results show that if RCA is obtained by crushing of compact, high-quality concrete, the procedures of aggregate quality improvement are not necessary.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Influence of acid treatment and carbonation on the properties of recycled concrete aggregate",
pages = "30-23",
number = "1",
volume = "24",
doi = "10.2298/CICEQ161202014R"
}

Radević, A., Despotović, I., Zakić, D., Orešković, M.,& Jevtić, D.. (2018). Influence of acid treatment and carbonation on the properties of recycled concrete aggregate. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Savez hemijskih inženjera, Beograd., 24(1), 23-30.
https://doi.org/10.2298/CICEQ161202014R

Radević A, Despotović I, Zakić D, Orešković M, Jevtić D. Influence of acid treatment and carbonation on the properties of recycled concrete aggregate. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2018;24(1):23-30.
doi:10.2298/CICEQ161202014R .

Radević, Aleksandar, Despotović, Iva, Zakić, Dimitrije, Orešković, Marko, Jevtić, Dragica, "Influence of acid treatment and carbonation on the properties of recycled concrete aggregate" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 24, no. 1 (2018):23-30,
https://doi.org/10.2298/CICEQ161202014R . .

TY  - CONF
AU  - Zakić, Dimitrije
AU  - Despotović, Iva
AU  - Radević, Aleksandar
AU  - Rajaković- Ognjanović, Vladana
AU  - Luković, Dragan
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2634
AB  - As a result of increasing global environmental awareness and sense of responsibility for future generation lives, utilization of demolition waste as potential aggregate for structural concrete has been proposed. Reducing production and transport costs of natural aggregate, as well as solving the problem of removal and disposal of large quantities of demolished concrete waste, represent significant issues in contemporary civil engineering. The main subject of the study presented in this paper is the analysis of the possibility of recycled concrete aggregate (RCA) treatment using organic acid, in order to improve the properties of recycled aggregate.
C3  - XIV International Scientific Conference iNDiS 2018 and Subconference "Eco build"
T1  - Influence of organic acid treatement on recycled concrete aggregate
EP  - 404
SP  - 399
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2634
ER  - 

@conference{
author = "Zakić, Dimitrije and Despotović, Iva and Radević, Aleksandar and Rajaković- Ognjanović, Vladana and Luković, Dragan",
year = "2018",
abstract = "As a result of increasing global environmental awareness and sense of responsibility for future generation lives, utilization of demolition waste as potential aggregate for structural concrete has been proposed. Reducing production and transport costs of natural aggregate, as well as solving the problem of removal and disposal of large quantities of demolished concrete waste, represent significant issues in contemporary civil engineering. The main subject of the study presented in this paper is the analysis of the possibility of recycled concrete aggregate (RCA) treatment using organic acid, in order to improve the properties of recycled aggregate.",
journal = "XIV International Scientific Conference iNDiS 2018 and Subconference "Eco build"",
title = "Influence of organic acid treatement on recycled concrete aggregate",
pages = "404-399",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2634"
}

Zakić, D., Despotović, I., Radević, A., Rajaković- Ognjanović, V.,& Luković, D.. (2018). Influence of organic acid treatement on recycled concrete aggregate. in XIV International Scientific Conference iNDiS 2018 and Subconference "Eco build", 399-404.
https://hdl.handle.net/21.15107/rcub_grafar_2634

Zakić D, Despotović I, Radević A, Rajaković- Ognjanović V, Luković D. Influence of organic acid treatement on recycled concrete aggregate. in XIV International Scientific Conference iNDiS 2018 and Subconference "Eco build". 2018;:399-404.
https://hdl.handle.net/21.15107/rcub_grafar_2634 .

Zakić, Dimitrije, Despotović, Iva, Radević, Aleksandar, Rajaković- Ognjanović, Vladana, Luković, Dragan, "Influence of organic acid treatement on recycled concrete aggregate" in XIV International Scientific Conference iNDiS 2018 and Subconference "Eco build" (2018):399-404,
https://hdl.handle.net/21.15107/rcub_grafar_2634 .

TY  - JOUR
AU  - Radević, Aleksandar
AU  - Despotović, Iva
AU  - Zakić, Dimitrije
AU  - Orešković, Marko
AU  - Jevtić, Dragica
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1995
AB  - Recycled concrete aggregate (RCA), obtained by crushing of original (old)
concrete, consists of natural aggregate grains and a cement mortar matrix. The
presence of old adhered cement mortar, which has higher porosity than natural
aggregate, causes unfavourable properties of RCA. The research conducted in
order to improve the quality of RCA and to enable its greater application in the
construction industry is presented in this paper. Therefore, RCA was subjected
to quality improvement treatments with hydrochloric acid and carbon dioxide
(accelerated carbonation). The first procedure was aimed at partially removing
the adhered cement mortar and the second at reinforcing the cement matrix. The
physical, mechanical and chemical properties of all three types of RCA were
tested. After the pre-soaking acid treatment (0.1 mol/dm3 HCl), RCA showed
reduced water absorption (up to 3%); the process of accelerated carbonation
also led to reduced water absorption (13–20%) as well as to improved mechanical
properties (∼10%). A scanning electron microscopy investigation revealed
that the carbonation process, as expected, significantly reduces porosity of RCA.
The overall results show that if RCA is obtained by crushing of compact, high-
-quality concrete, the procedures of aggregate quality improvement are not necessary
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Influence of acid treatment and carbonation on the properties of recycled concrete aggregate
VL  - 24(1)
DO  - 10.2298/CICEQ161202014R
ER  - 

@article{
author = "Radević, Aleksandar and Despotović, Iva and Zakić, Dimitrije and Orešković, Marko and Jevtić, Dragica",
year = "2017",
abstract = "Recycled concrete aggregate (RCA), obtained by crushing of original (old)
concrete, consists of natural aggregate grains and a cement mortar matrix. The
presence of old adhered cement mortar, which has higher porosity than natural
aggregate, causes unfavourable properties of RCA. The research conducted in
order to improve the quality of RCA and to enable its greater application in the
construction industry is presented in this paper. Therefore, RCA was subjected
to quality improvement treatments with hydrochloric acid and carbon dioxide
(accelerated carbonation). The first procedure was aimed at partially removing
the adhered cement mortar and the second at reinforcing the cement matrix. The
physical, mechanical and chemical properties of all three types of RCA were
tested. After the pre-soaking acid treatment (0.1 mol/dm3 HCl), RCA showed
reduced water absorption (up to 3%); the process of accelerated carbonation
also led to reduced water absorption (13–20%) as well as to improved mechanical
properties (∼10%). A scanning electron microscopy investigation revealed
that the carbonation process, as expected, significantly reduces porosity of RCA.
The overall results show that if RCA is obtained by crushing of compact, high-
-quality concrete, the procedures of aggregate quality improvement are not necessary",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Influence of acid treatment and carbonation on the properties of recycled concrete aggregate",
volume = "24(1)",
doi = "10.2298/CICEQ161202014R"
}

Radević, A., Despotović, I., Zakić, D., Orešković, M.,& Jevtić, D.. (2017). Influence of acid treatment and carbonation on the properties of recycled concrete aggregate. in Chemical Industry & Chemical Engineering Quarterly, 24(1).
https://doi.org/10.2298/CICEQ161202014R

Radević A, Despotović I, Zakić D, Orešković M, Jevtić D. Influence of acid treatment and carbonation on the properties of recycled concrete aggregate. in Chemical Industry & Chemical Engineering Quarterly. 2017;24(1).
doi:10.2298/CICEQ161202014R .

Radević, Aleksandar, Despotović, Iva, Zakić, Dimitrije, Orešković, Marko, Jevtić, Dragica, "Influence of acid treatment and carbonation on the properties of recycled concrete aggregate" in Chemical Industry & Chemical Engineering Quarterly, 24(1) (2017),
https://doi.org/10.2298/CICEQ161202014R . .

TY  - CONF
AU  - Zakić, Dimitrije
AU  - Despotović, Iva
AU  - Radević, Aleksandar
AU  - Vrcelj, Dijana
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2646
AB  - Lack of good-quality natural aggregates well as the problem of removal and
disposal of large quantities of demolished concrete waste, represent significant challenges
in contemporary civil engineering. The testing results of properties of recycled concrete
aggregate are presented in the first part of the paper. The second part deals with
experimental research on properties of fresh and hardened concrete made with 50%
substitution of coarse river aggregate by recycled concrete. Four series of concrete
specimens were tested, two of which were made with addition of steel fibers. The research
included testing of the following properties: density, compressive strength, splitting tensile
strength, adhesion by pull-off method, static modulus of elasticity, as well as the impact
resistance. The obtained results indicate that recycled concrete aggregate can be
successfully applied for production of steel fiber reinforced concrete
C3  - 5th International conference Contemporary achievements in civil engineering in 2017
T1  - Possible application of recycled concrete aggregate for production of steel fiber reinforced concrete
EP  - 482
SP  - 473
DO  - 10.14415/konferencijaGFS2017.050
ER  - 

@conference{
author = "Zakić, Dimitrije and Despotović, Iva and Radević, Aleksandar and Vrcelj, Dijana",
year = "2017",
abstract = "Lack of good-quality natural aggregates well as the problem of removal and
disposal of large quantities of demolished concrete waste, represent significant challenges
in contemporary civil engineering. The testing results of properties of recycled concrete
aggregate are presented in the first part of the paper. The second part deals with
experimental research on properties of fresh and hardened concrete made with 50%
substitution of coarse river aggregate by recycled concrete. Four series of concrete
specimens were tested, two of which were made with addition of steel fibers. The research
included testing of the following properties: density, compressive strength, splitting tensile
strength, adhesion by pull-off method, static modulus of elasticity, as well as the impact
resistance. The obtained results indicate that recycled concrete aggregate can be
successfully applied for production of steel fiber reinforced concrete",
journal = "5th International conference Contemporary achievements in civil engineering in 2017",
title = "Possible application of recycled concrete aggregate for production of steel fiber reinforced concrete",
pages = "482-473",
doi = "10.14415/konferencijaGFS2017.050"
}

Zakić, D., Despotović, I., Radević, A.,& Vrcelj, D.. (2017). Possible application of recycled concrete aggregate for production of steel fiber reinforced concrete. in 5th International conference Contemporary achievements in civil engineering in 2017, 473-482.
https://doi.org/10.14415/konferencijaGFS2017.050

Zakić D, Despotović I, Radević A, Vrcelj D. Possible application of recycled concrete aggregate for production of steel fiber reinforced concrete. in 5th International conference Contemporary achievements in civil engineering in 2017. 2017;:473-482.
doi:10.14415/konferencijaGFS2017.050 .

Zakić, Dimitrije, Despotović, Iva, Radević, Aleksandar, Vrcelj, Dijana, "Possible application of recycled concrete aggregate for production of steel fiber reinforced concrete" in 5th International conference Contemporary achievements in civil engineering in 2017 (2017):473-482,
https://doi.org/10.14415/konferencijaGFS2017.050 . .