Novel Test Method for Assessing Bonding Capacity of Self-Healing Products in Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 4
Abstract
Many tests and methods can be used to assess or verify the self-healing mechanisms of cement-based materials. This study, which is part of wider project, deals with the development and application of a test method for studying the self-healing ability of cementitious composites. The principle of this method lies in the bonding capacity of self-healing products under direct tension loads. A specially designed cylinder specimen was split after 7 days of water curing, and then the two parts of the split specimen were carefully put together immediately. A connector apparatus was designed to keep the surface of each part connected to each other with equal pressure for the “healing” process in water. After 30 days, the specimens were tested by a special direct tension test method to evaluate the bond loads. In addition, the crack-closing ratios were monitored on precracked disc-shaped specimens. The bond loads of 7 different ultra-high-performance concrete (UHPC) mixtures were compared with the crack-closing ratios. The healing process in the novel test, which simulated the self-healing of very narrow cracks, was observed to differ from the crack-closing test method. Considerable bond loads were obtained in both fly ash (308 N) and ground granulated blast furnace slag (GGBFS) (210 N) bearing mixtures. Additionally, the maximum crack-closing ratio (100%) was observed in the GGBFS bearing mixture.
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Acknowledgments
This study is part of a research project funded by TÜBİTAK (Project 215M783) and the Ph.D. thesis of the first author. The authors acknowledge TÜBİTAK for its support and financial assistance. The first author would like to express his gratitude to the Turkish Cement Manufacturers’ Association (TÇMB) and the Graduate School of Natural and Applied Sciences of Dokuz Eylül University for their support during his Ph.D. research. The authors are also grateful to Bekaert (Turkey), BASF (Turkey), Pomza Export, Dere Concrete, and OYAK Denizli Cement for their material support.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 4 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 1, 2018
Accepted: Sep 7, 2018
Published online: Feb 12, 2019
Published in print: Apr 1, 2019
Discussion open until: Jul 12, 2019
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