Article (Scientific journals)
Improving the properties of recycled concrete aggregates by accelerated carbonation
Zhao, Zengfeng; Remond, Sébastien; Damidot, Denis et al.
2018In Proceedings of the Institution of Civil Engineers. Construction Materials
Peer reviewed
 

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Abstract :
[en] Large amounts of construction and demolition wastes, especially concrete wastes, are generated annually. Until now, only a small fraction of concrete wastes has been reused as recycled concrete aggregates (RCA) in the manufacture of mortar and concrete. In order to optimise the use of RCA for new concrete, it is important to improve the properties of RCA. RCA are mainly composed of an intimate mix of natural aggregates and adherent hardened cement paste, which has a much larger porosity than natural aggregates. The influence of accelerated carbonation on the properties of RCA was studied in this work. Original concrete was manufactured and crushed by a jaw crusher in the laboratory. The different fractions of laboratory-produced RCA were stored in an accelerated carbonation room. The mass loss, density, porosity and water absorption of the RCA were tested before and after carbonation. Industrial RCA were also studied for comparison with the laboratory-produced RCA. The results clearly showed that, after accelerated carbonation, the density of the RCA increased due to the transformation of portlandite into calcite. The water absorption and porosity of the RCA decreased after carbonation.
Disciplines :
Civil engineering
Author, co-author :
Zhao, Zengfeng ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Remond, Sébastien;  IMT Lille Douai
Damidot, Denis;  IMT Lille Douai
Courard, Luc  ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Michel, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Language :
English
Title :
Improving the properties of recycled concrete aggregates by accelerated carbonation
Publication date :
21 May 2018
Journal title :
Proceedings of the Institution of Civil Engineers. Construction Materials
ISSN :
1747-650X
eISSN :
1747-6518
Publisher :
ICE Publishing, United Kingdom
Peer reviewed :
Peer reviewed
Available on ORBi :
since 01 March 2019

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