Preliminary Investigation of an Approach to Improve Water Impermeability in Concrete with Externally Bonded FRP Systems
Publication: Journal of Composites for Construction
Volume 25, Issue 6
Abstract
Good bond and water impermeability in fiber-reinforced polymer (FRP) bonded/coated systems are essential if the durability of FRP-rehabilitated concrete structures is to be ensured. In addition, water impermeability is required in some special FRP applications, such as the strengthening of underground water pipes. So far, there has been no method in the literature guaranteeing water impermeability in FRP strengthening works. This paper studies the feasibility of using a waterproof coating as the initial primer on cementitious materials before applying externally bonded FRP. In this preliminary investigation, by examining the two most important indicators (i.e., pull-off bond tests and water penetration tests), it was found that the use of an initial waterproof layer in the proposed FRP bonding system did not influence the pull-off bond strength but significantly improved the system's water impermeability. It is, therefore, suggested that an initial waterproof layer can be included in method statements for externally bonded FRP systems to upgrade the effectiveness and durability of FRP systems.
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Data Availability Statement
All data and models used during the study appear in the published article.
Acknowledgments
The authors are grateful to Professor Jin-Guang Teng at The Hong Kong Polytechnic University for his many discussions and advices in this study. The authors are grateful for the financial support received from the Research Grants Council of the Hong Kong Special Administrative Region (Project No. T22-502/18-R). The authors are also grateful to CASTCO Testing Center Limited and Dr. Mick Atha for their supports of experiments and language improvement in this paper, respectively.
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Published In
Journal of Composites for Construction
Volume 25 • Issue 6 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 26, 2020
Accepted: Jul 13, 2021
Published online: Aug 25, 2021
Published in print: Dec 1, 2021
Discussion open until: Jan 25, 2022
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