Experimental Evaluation of Bonding between CFRP Laminates and Different Structural Materials
Publication: Journal of Composites for Construction
Volume 20, Issue 3
Abstract
This study presents an analysis of carbon fiber reinforced polymers (CFRP)-to-parent material interfaces based on 40 single-lap shear tests intended to highlight the strength of the interfaces under fracture mode II. Three different substrates are analyzed: timber; concrete, and steel, using the same CFRP laminates and adhesive agent. The externally bonded reinforcement (EBR) technique was used throughout the study. The results show that the CFRP-to-timber interfaces had the highest strength but also showed that these interfaces need a longer bonded length in order to reach maximum strength, i.e., CFRP-to-timber interfaces had the longest effective bond length. The local nonlinear bond-slip curve of CFRP-to-concrete can be approximated to exponential curves, whereas the CFRP-to-timber or steel interfaces showed trilinear and bilinear bond-slip relations, respectively. Also, the CFRP-to-timber interfaces revealed the highest fracture energy.
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Acknowledgments
The authors are grateful to Fundação para a Ciência e Tecnologia for partial financing of the work under the UNIDEMI Strategic Project UID/EMS/00667/2013.
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Information
Published In
Journal of Composites for Construction
Volume 20 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 8, 2015
Accepted: Aug 10, 2015
Published online: Oct 21, 2015
Discussion open until: Mar 21, 2016
Published in print: Jun 1, 2016
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