Estimating Stress Relaxation and Cracking Potential of High-Strength Concrete Reinforced with Polyvinyl Alcohol Fiber at Early Age
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 9
Abstract
High-strength concrete (HSC) with a low water-to-cement (w/c) ratio always exhibits high shrinkage at an early age. Concrete with shrinkage that is subjected to restraint is prone to trigger harmful cracking, which facilitates the application of fibers. Although mechanical properties of cementitious materials with various fibers have been extensively investigated, little research has characterized the stress relaxation and cracking potential of HSC with polyvinyl alcohol (PVA) fibers. This paper aimed to expand the limitation by means of the experiment campaign, including free shrinkage measurements and restrained ring tests on HSC with PVA fibers. The proportion of PVA fibers was 0.0%, 0.2%, 0.4%, and 0.6% by volume of HSC. Experimental study and the corresponding analysis indicated the following: free shrinkage of HSC diminished as the PVA fiber proportion increased; residual stress induced from the restrained shrinkage of the concrete ring diminished with an increase of the PVA fiber proportion; the reduction in the stress rate correlated with an increase in the PVA fiber proportion. Relaxed stress increased as PVA fiber proportion increased; the age of cracking of the HSC was postponed due to the incorporation of PVA fibers; and a low cracking potential of HSC was revealed as the PVA fiber proportion increased.
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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 the Central Universities (Grant No. 2019B52814) is also gratefully acknowledged. This work is also sponsored by Qing Lan Project of Jiangsu Province of China.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 9 • September 2022
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© 2022 American Society of Civil Engineers.
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Received: Jun 24, 2021
Accepted: Jan 14, 2022
Published online: Jun 27, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 27, 2022
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