Peel and Shear Fracture Characterization of Debonding in FRP Plated Concrete Affected by Moisture
Publication: Journal of Composites for Construction
Volume 10, Issue 1
Abstract
The objective of this paper is to develop a new mechanistic understanding of moisture affected debonding failures in carbon fiber reinforced polymer (CFRP) plated concrete systems by mechanically testing accelerated moisture conditioned mesoscale peel and shear interface fracture specimens. Central to the investigation is the use of interface fracture toughness as the quantification parameter of the CFRP-epoxy-concrete trilayer system, which is considered a bond property, to analyze, compare, and correlate physical observations. Results have shown that fracture toughness of the CFRP bonded concrete systems significantly degrades, and its value becomes asymptotic with increasing moisture ingress. This asymptotic behavior is associated with certain moisture concentration levels as predicted by a three-dimensional moisture diffusion simulation. The generally observed debonding mode by concrete delamination for the dry specimens changes to an epoxy/concrete interface separation mode for the wet specimens. Finite element fracture computation, mixed-mode characterization, and kink criterion implementation synergistically suggest that the interface separation mode is attributed to an interfacial material toughening and an interface weakening mechanism as a consequence of moisture diffusion.
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Acknowledgments
This research was supported by the National Science Foundation (NSF) CMS Grant No. 0010126. The writers are grateful to Dr. Perumalsamy N. Balaguru, the cognizant NSF official, for his interest and support in this work. The writers would also like to thank Professor John W. Hutchinson of Harvard University and Professor Ferdinand Rostasy of the Technical University of Braunschweig for their valuable comments and suggestions.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 1 • February 2006
Pages: 35 - 47
Copyright
© 2006 ASCE.
History
Received: Jan 4, 2005
Accepted: Jul 14, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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