Characterization of Damage and Healing of Cement Matrices Based on Fly Ash under Repeated Loading
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 1
Abstract
This paper investigates damage and healing of cementitious materials based on fly ash (FA) with a special focus on the effect of repeated loading on the self-healing performance. In total, 90 prism specimens and 33 cylinder specimens were prepared and tested. Variables including the FA replacement ratio and preloading level were considered. Different methods were adopted to evaluate the self-healing performance, i.e., mechanical tests, acoustic emission (AE) analysis, water absorption measurement, and scanning electron microscope (SEM) observation. Test results revealed that an appropriate amount of cement replaced by FA was beneficial to the self-healing performance of the specimens subjected to a high level of repeated preloading, where the strength increased by 11% and the water absorption rate decreased by 12%, in comparison with that of the undamaged specimens. This was attributed to the active hydration of FA, which was confirmed by an energy dispersive X-ray spectroscopy (EDS) analysis. This study extends understanding of the self-healing performance when subjected to repeated loading and provides some useful suggestions for the self-healing technique based on mineral additives.
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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 authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (Nos. 51878485 and 51938013) and the Top Interdisciplinary Funds of Civil Engineering for Tongji University. Thanks also go to Professor Xiang-Lin Gu for his guidance. Furthermore, the help from undergraduate students Lian-Zhi Zhang and Rui-Qi Deng is appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 10, 2020
Accepted: Jun 24, 2020
Published online: Oct 21, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 21, 2021
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