Bond Characteristics of Various NSM FRP Reinforcements in Concrete
Publication: Journal of Composites for Construction
Volume 17, Issue 1
Abstract
The rehabilitation and strengthening technique using near-surface mounted (NSM) fiber-reinforced polymer (FRP) has proved to be a reliable alternative to the existing methods for deficient concrete structures. To effectively apply this method, bond characteristics at the interface need to be fully understood. This paper presents the results of the bond performance of a wide range of embedded FRP NSM reinforcements with various surface configurations, cross-sectional shapes, material types, adhesive types, and groove sizes. A total of 109 concrete specimens (with a dimension of ) were tested under direct pull-out loading configuration. It was found that both specimen sets using NSM bars treated with spirally wound and sand coating with indentation and groove displayed the best performance. Strip shape was more effective than round and square cross-sectional shapes. Higher bond strength was obtained by using carbon FRP than glass and adhesives with higher material bond strength. Increasing the groove sizes was fairly effective in improving the bond capacity. The existing bond strength models were also assessed in comparison with the test data in this paper.
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Acknowledgments
Assistance from the lab technicians and students is greatly appreciated. The writers would also like to thank, in no particular order, Sika, Hughes Brothers, Sireg, Dongwon Construction, Sto, Sigma DG, and Simpson Strong-Tie for their kind support of partial materials used in the study.
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Information & Authors
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Published In
Journal of Composites for Construction
Volume 17 • Issue 1 • February 2013
Pages: 117 - 129
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 13, 2012
Accepted: Jun 5, 2012
Published online: Aug 7, 2012
Published in print: Feb 1, 2013
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