Early Age Shrinkage of Self-Consolidating Concrete Incorporated with Three Shrinkage-Reducing Components
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 4
Abstract
Self-consolidating concrete (SCC) may experience autogenous and drying shrinkage due to a high content of cementitious materials, lower aggregate content, and smaller aggregate size, resulting in concrete cracking and other durability issues. In order to solve these problems, shrinkage-reducing materials have been proposed and studied, such as polypropylene fiber, lightweight fine aggregate, and expansive admixtures. However, investigation of the combined effect of the aforementioned three shrinkage-reducing materials on SCC is still unreported. This study examined the influence of polypropylene fiber (0.05%, 0.1%, 0.15% of the volume of the concrete), prewetted lightweight aggregate (10%, 20%, 40% of the volume of the fine aggregate), and expansive agent (0%, 8% of the cementitious materials weight) on the shrinkage of concrete during a seven-day curing period under two curing conditions, sealed cure and top-surface exposure cure. The results showed that it was more effective to mitigate early age shrinkage by adding lightweight aggregate alone than by adding polypropylene fiber alone. In the sealed cure (S-Cure) condition, adding 10% lightweight aggregate compensated for shrinkage, and 0.1% polypropylene fiber content exhibited the highest shrinkage reduction. With the top-surface exposure cure (TE-Cure) condition, 20% lightweight aggregate compensated for shrinkage, and 0.15% content polypropylene fiber showed the highest shrinkage mitigation. It showed that the shrinkage of concrete, which has low polypropylene (PP) fiber content (0.05% and 0.10%) and no expansive agent added, was decreased with the increase of lightweight aggregate content. At a high content of PP fiber of 0.15%, the incorporation of lightweight aggregate did not exhibit significant influence on shrinkage reduction.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Financial support provided by the Natural Science Foundation of Liaoning Province (Grant No. 2021-MS-129), the Foundation for High-Level Talent Innovation Support Program of Dalian (Grant No. 2019RD05), and the Fundamental Research Funds for the Central Universities (Project Nos. DUT20JC02 and DUT21GJ207) is greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 13, 2021
Accepted: Aug 3, 2022
Published online: Jan 28, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 28, 2023
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Cited by
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