Experimental Analysis of Bond between Corroded Steel Bar and Concrete Confined with Textile-Reinforced Concrete
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 10
Abstract
The issue of steel bar corrosion has seriously affected the working performance of concrete structures. Reinforcement is an effective measure to restore the mechanical properties and prolong the service life of concrete structures. Determining the bond properties between textile-reinforced concrete (TRC)–confined concrete and a corroded steel bar is one of the main issues in evaluating the effect of TRC reinforcement. Based on the results of electrochemical corrosion and pullout tests, the bond properties between concrete and a steel bar under unconfined and TRC–confined conditions were comparatively analyzed in terms of the corrosion-induced cracking, failure mode, bond-slip curve, bond strength, and bond failure mechanism. The empirical calculation formula of the ultimate bond strength between unconfined concrete and a corroded steel bar was obtained, and the confinement effects of TRC and fiber-reinforced polymer (FRP) were compared by collecting data from the relevant literature. The research results indicated that TRC confinement can effectively improve the bond properties between concrete and a corroded steel bar and limit the development of corrosion-induced cracks. Furthermore, TRC confinement controlled any further crack expansion during the pulling out of the steel bar. After TRC confinement, the brittle failure characteristic of the bond behavior between concrete and a corroded steel bar was improved, and the failure mode was changed from splitting to splitting–pullout. The confinement effect of TRC using a lower fiber-reinforcement ratio is similar to that of FRP.
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Data Availability Statement
The data sets used or analyzed in this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the financial support of the Fundamental Research Funds for the Central Universities (2017XKZD09). The experimental work described in this paper was conducted at the Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Civil Engineering in the China University of Mining and Technology. Help received during the testing from staff and students at the laboratory is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 18, 2018
Accepted: Apr 8, 2019
Published online: Jul 16, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 16, 2019
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