Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/68928
Title: Performance enhancement of recycled concrete aggregates through carbonation
Authors: Zhang, JK
Shi, CJ
Li, YK
Pan, XY
Poon, CS 
Xie, ZB
Keywords: Recycled concrete aggregate
Carbonation treatment
Physical properties
Mechanical properties
Issue Date: 2015
Publisher: American Society of Civil Engineers
Source: Journal of materials in civil engineering, 2015, v. 27, no. 11, 04015029, p. 1-7 How to cite?
Journal: Journal of materials in civil engineering 
Abstract: The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, CO2CO2 reacted with Ca(OH)2Ca(OH)2 and calcium silicate hydrate (C–S–HC─S─H) to form CaCO3CaCO3 and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.
URI: http://hdl.handle.net/10397/68928
ISSN: 0899-1561
EISSN: 1943-5533
DOI: 10.1061/(ASCE)MT.1943-5533.0001296
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