Effect of Carbonation Mixing on Uptake and Strength Gain in Concrete
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
Concrete is well known for its capacity to sequester carbon dioxide () through carbonation curing. If carbonation mixing can be used to introduce during concrete mixing, the process is able to enhance the carbon capture and storage capacity of concrete and makes the technology available to both precast and cast-in-place concretes. This paper studies the effect of carbonation mixing on uptake and strength gain of cement paste, which is the key carbon-reactive ingredient in concrete. Three mixing methods were investigated: (1) normal air mixing, (2) carbonation mixing, and (3) hybrid mixing with carbonation mixing first, followed by normal air mixing. Two curing methods, air curing and carbonation curing, were also studied to examine the effect of carbonation mixing on curing. It was found that carbonation mixing could increase the uptake but decrease the strength gain. The reduction in strength by carbonation mixing was caused by the formation of carbonate coating on cement particles. The property can be improved if air mixing is introduced right after carbonation mixing.
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Acknowledgments
The support from the China Ministry of Science and Technology under Grant No. 2015CB655101 and the National Natural Science Foundation of China (NSFC) under Grant No. 51379163 are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 15, 2016
Accepted: Apr 11, 2017
Published online: Jul 8, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 8, 2017
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