Performance Enhancement of Recycled Concrete Aggregates through Carbonation
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 11
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, reacted with and calcium silicate hydrate () to form 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.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 1, 2014
Accepted: Jan 29, 2015
Published online: Mar 18, 2015
Discussion open until: Aug 18, 2015
Published in print: Nov 1, 2015
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