Effect of Nano-Kaolinite Clay on Rebar Corrosion and Bond Behavior Between Rebar and Concrete
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 1
Abstract
The effect of nano-kaolinite clay (NKC) on the bond behavior between rebar and concrete was studied in a series of experiments. An electrical corrosion method was used to corrode the rebar embedded in concrete specimens. Chloride diffusion and chloride content tests were performed to evaluate the effect of nanoclay on the chloride diffusion depth and chloride ion content in concrete. Pullout tests were performed to assess the bond properties, including the bond-slip curve and ultimate bond strength, between concrete and rebar before and after corrosion. The results revealed that NKC improved the chloride resistivity and bonding in the concrete specimens. The specimens with a 5% nanoclay addition showed the lowest percentage of the rebar corrosion level and bond strength degradation due to corrosion. After 48 h of corrosion, the rebar corrosion ratio decreased by 52%, and the ultimate bond strength increased by 35% compared to the control specimen.
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Data Availability Statement
The data used to support the findings of this study are available from the corresponding author upon request.
Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 51908342, 51808326, and 51578099) and by the Natural Science Foundation of Shandong Province (Grant No. ZR2018PEE021), to which the authors are very grateful.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 1 • January 2021
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© 2020 American Society of Civil Engineers.
History
Received: Mar 8, 2019
Accepted: Jun 30, 2020
Published online: Oct 25, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 25, 2021
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