Experimental Investigation on Correlation between Autogenous Shrinkage and Internal Relative Humidity of Superabsorbent Polymer–Modified Concrete
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 2
Abstract
This research investigated the effect of superabsorbent polymers (SAPs) (0%, 0.17%, 0.35%, and 0.49% of cement content by weight) on the correlation between autogenous shrinkage (AS) and internal relative humidity (IRH) of high strength concrete under sealing conditions. An integrated device was designed to measure the IRH and AS of concrete simultaneously. Experimental results and analysis indicated that (1) the IRH of the SAP-modified concrete at 28 days and the critical time of the IRH increased as dosages of SAPs increased; (2) the expansion of the SAP-modified concrete at an early age was obvious within the first day, and the expansion peak increased as the dosages of SAPs increased; (3) the AS at 28 days and the AS rate of the SAP-modified concrete decreased as the dosages of SAPs increased; and (4) a prediction model for the AS of SAP-modified concrete was proposed considering concrete relative humidity and the quantity of internal curing water.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 51879092), the Fundamental Research Funds for the Central Universities of China (Grant No. 2019B52814), the Postgraduate Research and Practice Innovation Program of Jiangsu Province (Grant Nos. KYCX20_0454 and SJCX20_0166), and the Qing Lan Project of Jiangsu Province of China. The authors gratefully acknowledge the financial support.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 2 • February 2022
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© 2021 American Society of Civil Engineers.
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Received: Feb 11, 2021
Accepted: Jun 25, 2021
Published online: Nov 26, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 26, 2022
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