Influences of Corrosion Degree and Uniformity on Bond Strength and Cracking Pattern of Cement Mortar and PVA-ECC
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 6
Abstract
Engineered cementitious composites (ECCs), which have a strain-hardening behavior under tension, is widely used for repairing and retrofitting reinforced concrete structures. In such applications, the performance of the bond between the ECC and corroded rebar is critical for the service life prediction of the repaired structures. In this study, the cracking patterns and bond behavior of polyvinyl alcohol (PVA) ECCs (PVA-ECCs) and cement mortar with uniform and nonuniform corroded steel rebars were studied. It was found that the uniform corrosion–induced cracks were randomly distributed, while the nonuniform corrosion–induced cracks were concentrated perpendicular to the most corroded side. The bond strength of PVA-ECC and mortar specimens was independent of the corrosion method. The bond strength of PVA-ECC and mortar specimens both showed a trend of increasing first and then decreasing with the development of corrosion rate. The threshold corrosion rate for mortar specimens was 0.125%, and the threshold corrosion rate of PVA-ECC specimens was 0.922%.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Most corrosion tests were performed during the time the first author visited Iowa State University (ISU), and the support from the Department of Civil, Construction, and Environmental Engineering at ISU for the experiments is greatly appreciated. The authors would also like to acknowledge the financial support from the Natural Science Foundation of Zhejiang Province (Grant Nos. LR21E080002 and LZ20E080003) and the National Natural Science Foundation (Grant Nos. 51678529 and 51978620).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 6 • June 2023
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© 2023 American Society of Civil Engineers.
History
Received: May 16, 2022
Accepted: Oct 3, 2022
Published online: Mar 30, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 30, 2023
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