Bond Performance between Slightly Corroded Steel Bar and Concrete after Exposure to High Temperature
Publication: Journal of Structural Engineering
Volume 144, Issue 11
Abstract
Bond-slip characteristics of slightly corroded (less than 2% mass loss) reinforcing steel bars embedded in concrete were investigated with pull-out tests conducted after exposure to high temperature and subsequent cooling. Twenty-five scenarios consisting of five corrosion levels (0.0%, 0.5%, 1.0%, 1.5%, and 2.0% corrosion loss) and five exposed temperatures (20°C, 200°C, 400°C, 600°C, and 800°C) were tested. The results indicate that the slight corrosion of the reinforcement not only affects the bond performance of concrete and steel bars but also influences their reaction to elevated temperature before the exposure temperature exceeds 400°C. The effect of slight corrosion on bond-mechanics behavior was eliminated by the dramatic decrease in concrete strength and significantly different thermal expansion between concrete and steel as the exposure temperature reached 600°C.
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Acknowledgments
The research described in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 51578229).
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Published In
Journal of Structural Engineering
Volume 144 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 15, 2017
Accepted: Jun 5, 2018
Published online: Sep 5, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 5, 2019
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