Bond Efficiency of EBR and NSM FRP Systems for Strengthening Concrete Members
Publication: Journal of Composites for Construction
Volume 15, Issue 5
Abstract
This paper reports the results of an experimental program to investigate the bonding behavior of two different types of fiber-reinforced polymer (FRP) systems for strengthening RC members: externally bonded carbon (EBR) plates and bars or strips externally applied with the near-surface-mounted (NSM) technique. The overall experimental program consisted of 18 bond tests on concrete specimens strengthened with EBR carbon plates and 24 bond tests on concrete specimens strengthened with NSM systems (carbon, basalt, and glass bars, and carbon strips). Single shear tests (SST) were carried out on concrete prisms with low compressive strengths to investigate the bonding behavior of existing RC structures strengthened with different types of FRP systems. The performance of each reinforcement system is presented, discussed, and compared in terms of failure mode, debonding load, load-slip relationship, and strain distribution. The findings indicate that the NSM technique could represent a sound alternative to EBR systems because it allows debonding to be delayed, and hence FRP tensile strength to be better exploited.
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Acknowledgments
The experimental activities were developed within the research work of the European Network for Composite Reinforcement—TR 3.9 and the research project DPC-Reluis Project 2010-2013. The authors thank Pino Campanella and Emanuele Scaiella for their helpful contributions in carrying out the tests.
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Published In
Journal of Composites for Construction
Volume 15 • Issue 5 • October 2011
Pages: 757 - 772
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 30, 2010
Accepted: Jan 11, 2011
Published online: Jan 13, 2011
Published in print: Oct 1, 2011
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