Influence of Loading Ages on the Early Age Tensile Creep of High-Strength Concrete Modified with Superabsorbent Polymers
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 5
Abstract
This research investigated tensile creep of early age high-strength concrete (HSC) modified with superabsorbent polymer (SAP). A temperature stress test machine was utilized to investigate the influence of loading age (0.50, 0.67, 0.83, 1, 3, 5, and 7 days) on the tensile creep performance of HSC modified with SAP at early age. The experimental analyses indicated that (1) the basic tensile creep, basic tensile creep coefficient, and specific basic tensile creep of HSC modified with SAP decreased with increasing loading age, and the aging effect on the tensile creep of HSC modified with SAP was significant when the concrete was loaded within 1 day; (2) the specific basic tensile creep rate was high at early loading ages, then decreased and tended to be stable, and the earlier the loading age, the greater was the divergence between the initial creep rate and the later creep rate at the same loading age; and (3) the relative specific basic tensile creep decreased exponentially when concrete was loaded within 1 day and decreased linearly when concrete was loaded after 3 days, and the proportionality limit of specific basic tensile creep occurred at a loading age of 1.60 days, which was determined by linear and nonlinear regression analysis. A model for predicting the tensile creep of HSC modified with SAP considering loading age is proposed.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The financial support of the National Natural Science Foundation of China (Grant No. 51879092) is gratefully acknowledged. The support of the Fundamental Research Funds for Central Universities of China (Grant No. 2019B52814) also is gratefully acknowledged. This work also is sponsored by the Qing Lan Project of Jiangsu Province of China.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 5 • May 2022
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© 2022 American Society of Civil Engineers.
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Received: Jun 16, 2021
Accepted: Sep 17, 2021
Published online: Feb 23, 2022
Published in print: May 1, 2022
Discussion open until: Jul 23, 2022
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