Carbonation Curing of Slag-Cement Concrete for Binding and Improving Performance
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 4
Abstract
Early age carbonation curing of slag-cement concrete was investigated to assess the feasibility of binding in slag-cement building products while improving their short-term and long-term performances. Four binder types were compared: an ordinary portland cement; an 85/15 slag cement; a 75/25 slag blend; and a 50/50 slag blend. A 2-h carbonation-curing treatment allowed concretes to bind 8–10% by mass of binder and attain as much as 82% of the 24-h hydration strength. The subsequent strength development of carbonated concrete was slower in the first 24 h possibly due to the carbonate buildup, but it was comparable to the conventionally hydrated concrete after 28 days. The carbonated concrete was shown to have a fracture toughness comparable to that of the hydrated concrete. The freeze/thaw durability of the concrete in deicing salt solution was vastly improved by the carbonation treatment. The pH of the carbonated concrete was reduced but was still above the threshold level required for the passivation of iron. The use of slag in carbonation curing is beneficial to strength gain, shrinkage reduction, and deicing salt resistance.
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Acknowledgments
The writers would like to thank Asphalte Hi-Tech for the granite and St. Lawrence Cement for Type I cement, slag cement, and GGBF slag. The research was supported with funding from Natural Science and Engineering Research Council of Canada (NSERC) and St. Lawrence Cement.UNSPECIFIED
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© 2010 ASCE.
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Received: Aug 8, 2008
Accepted: May 15, 2009
Published online: May 16, 2009
Published in print: Apr 2010
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