Influence of Thermomechanical Pulp Fiber Compositions on Internal Curing of Cementitious Materials
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 8
Abstract
This research examines the efficiency of thermomechanical pulp (TMP) fibers, both untreated and after chemical treatment to produce holocellulose and -cellulose, for internal curing. In addition, the effect of TMP fibers on early hydration behavior was investigated. The results show that TMP and -cellulose fibers had a negligible effect on cement hydration. Holocellulose, conversely, significantly reduced the rate of hydration, noticeably delaying setting time. The addition of the fibers in dosages to provide an additional amount of entrained water of 0.05 g per gram of cement resulted in a decrease of early autogenous shrinkage of cement paste. Holocellulose, reducing autogenous shrinkage of cement paste by 93%, was shown to be the most effective for internal curing; however, its adverse effect on cement hydration may require acceleratory admixtures when used in concrete. Thermomechanical pulp and -cellulose showed a similar efficiency in mitigating autogenous shrinkage; these fibers reduced shrinkage of cement paste by approximately 51 and 45%, respectively.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 8 • August 2012
Pages: 970 - 975
Copyright
© 2012. American Society of Civil Engineers.
History
Received: May 4, 2011
Accepted: Dec 12, 2011
Published online: Dec 14, 2011
Published in print: Aug 1, 2012
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