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Title: Effect of carbonation of modeled recycled coarse aggregate on the mechanical properties of modeled recycled aggregate concrete
Authors: Li, L 
Xiao, JZ
Xuan, DX 
Poon, CS 
Keywords: Modeled recycled aggregate concrete (MRAC)
Carbonation treatment
Compressive strength
Water-to-cement ratio
Issue Date: 2018
Publisher: Pergamon Press
Source: Cement and concrete composites, May 2018, v. 89, p. 169-180 How to cite?
Journal: Cement and concrete composites 
Abstract: The modeled recycled aggregate concrete (MRAC) which is an idealized model for the real recycled aggregate concrete (RAC) was used in this study. The MRCAs prepared with two types of old mortars were modified by an accelerated carbonation process. The effects of carbonation of MRCA on the microhardness of MRCA and the mechanical properties of MRAC were investigated. The results indicated that the micro-hardness of the old interfacial transition zone (ITZ) and the old mortar in the carbonated MRCAs was higher than that in the uncarbonated MRCAs, and the enhancement of the old ITZ was more significant than that of the old mortar. The compressive strength and modulus of MRACs increased when the carbonated MRCAs were utilized, and the improvement was more significant for MRAC prepared with a higher w/c. In addition, a numerical study was carried out and it showed that the improvement in strength by carbonation treatment was less obvious when the difference between the new and old mortar was larger.
ISSN: 0958-9465
EISSN: 1873-393X
DOI: 10.1016/j.cemconcomp.2018.02.018
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