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Influence of acid treatment and carbonation on the properties of recycled concrete aggregate

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2018
960.pdf (2.590Mb)
Authors
Radević, Aleksandar
Despotović, Iva
Zakić, Dimitrije
Orešković, Marko
Jevtić, Dragica
Article (Published version)
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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 m...echanical 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.

Keywords:
accelerated carbonation / pre-soaking in acid / recycled concrete aggregate
Source:
Chemical Industry and Chemical Engineering Quarterly / CICEQ, 2018, 24, 1, 23-30
Publisher:
  • Savez hemijskih inženjera, Beograd
Funding / projects:
  • Research on condition assessment and improvement methods of civil engineering structures in view of their serviceability, load-bearing capacity, cost effectiveness and maintenance (RS-36048)
  • Utilization of by-products and recycled waste materials in concrete composites in the scope of sustainable construction development in Serbia: investigation and environmental assessment of possible applications (RS-36017)

DOI: 10.2298/CICEQ161202014R

ISSN: 1451-9372

WoS: 000430423900003

Scopus: 2-s2.0-85046015241
[ Google Scholar ]
11
8
URI
https://grafar.grf.bg.ac.rs/handle/123456789/962
Collections
  • Radovi istraživača / Researcher's publications
  • Катедра за материјале и конструкције
  • Катедра за путеве, аеродроме и железнице
Institution/Community
GraFar
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 . .

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