Simplified Model for Corrosion-Induced Bond Degradation between Steel Strand and Concrete
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 4
Abstract
The corrosion-induced bond degradation between corroded steel strands and concrete is investigated in the present study. Ten pull-out specimens with different corrosion levels were tested to study corrosion’s effects on concrete splitting, strand twisting, failure mode, and global force-displacement behavior. The local bond characteristics are discussed and derived based on the test results. Experimental results show that the bond behavior depends on the corrosion loss level and does not have a monotonic trend. Strand corrosion had beneficial effects on the bond strength when the corrosion loss is less than 6.24% in the current study. The corrosion loss significantly decreased the bond strength when the corrosion loss is greater than 9.26% or the corrosion-induced crack is wider than 0.67 mm. The strand will be pulled out instead of fracturing when the corrosion loss exceeds 8%. Corrosion affects the bond strength more significantly than the tension strength for severe corrosion conditions. A simplified model is proposed to predict the residual bond strength between corroded strands and concrete. The proposed model’s predictions are validated with experimental data. Several conclusions and suggestions for future work are drawn based on the conducted study.
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Acknowledgments
This work reported here was conducted with the financial supports from National Basic Research Program of China (973 Program, Grant No. 2015CB057705), National Natural Science Foundation of China (Grant No. 51678069), the Special Fund of Excellent Doctoral Dissertations of China (Grant No. 201247), Hunan Provincial Natural Science Foundation of China (Grant No. 14JJ1022), and Open Fund of Key Laboratory of Bridge Engineering Safety Control by Hunan Province, Department of Education (Changsha University of Science and Technology, Grant No. 14KD10). Their support is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 4 • April 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Oct 23, 2015
Accepted: Aug 11, 2016
Published online: Nov 3, 2016
Published in print: Apr 1, 2017
Discussion open until: Apr 3, 2017
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