Effect of Fly Ash Contents in Autogenous Self-Healing of Conventional Concretes Analyzed Using Different Test Tools
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
Concrete structures are susceptible to cracking, contributing to the penetration and transport of deleterious agents, which may compromise their durability. At the end of the 19th century, a natural capacity of the concrete in sealing cracks was noted, which would later be called autogenous self-healing. This article aims to explore the effect of fly ash contents in autogenous self-healing of conventional concretes using different test tools. Therefore, the durability of the material was indirectly assessed. The age of cracking was also analyzed. Concrete specimens with different fly ash contents (0%, 12%, and 27%) were cracked by compression at 7 and 28 days. Subsequently, durability tests were performed on the day of cracking and after 84 days under wetting and drying cycles to stimulate self-healing mechanisms. The results demonstrated the beneficial effects of self-healing on concrete containing fly ash when the analyzed parameter is more focused on the concrete bulk of the test specimens (ultrasonic pulse velocity and resistance to chloride ingress). When the analyzed parameter is related to the surface of the specimens (resistance to carbonation), the effect of cracking is more evident in concrete without fly ash.
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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 thank the Brazilian Federal Agency for the Support and Evaluation of Graduate Education (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES), the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico and Tecnológico—CNPQ), and the Araucária Foundation for their support in conducting this study.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 7, 2020
Accepted: Nov 20, 2020
Published online: Apr 30, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 30, 2021
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