Effect of Internal Curing on Characteristics of Self-Compacting Concrete by Using Fine and Coarse Lightweight Aggregates
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
Internally cured concrete made with prewetted lightweight aggregates (LWAs) has a risk of segregation because of floating LWAs in the process of vibration. Such risk can be reduced by applying internal curing in self-compacting concrete, because it can avoid vibration or rodding processes. In this study, internally cured self-compacting concretes with fine or coarse LWAs were prepared with a replacement level of 20 and 40% by volume of normal-weight aggregates. A segregation resistance test was performed to quantitatively evaluate the floating of LWAs in self-compacting concrete. The effectiveness of internal curing was evaluated in terms of workability, compressive strength, autogenous shrinkage, and transport properties (i.e., water absorption, water desorption, and chloride resistance). Transport properties were also examined for internally cured mortar, which has identical ingredient proportions to the corresponding concretes used for comparison. The results showed that internal curing is useful in reducing the autogenous shrinkage of self-compacting concrete, and no segregation was observed for the fresh concretes. It was also found that the fine LWAs exhibited a better performance in reducing autogenous shrinkage and improving the transport properties compared with the coarse LWAs. The comparison of water absorption test results between a mortar and its corresponding concrete reveals that an increase in the volume fraction of normal-weight aggregates may decrease the effectiveness of internal curing.
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Acknowledgments
The presented work was financially supported by the National Natural Science Foundation of China (Grant No. 51378090) and the National Key Basic Research Program of China (973 Program) (Nos. 2015CB057703 and 2015CB057701).
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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: Oct 31, 2016
Accepted: Apr 14, 2017
Published online: Jul 19, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 19, 2017
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