Experimental Evaluation of Bonding between CFRP Laminates and Different Structural Materials

Hugo C. Biscaia, Carlos Chastre, Isabel S. Borba, Cinderela Silva, David Cruz

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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. (C) 2015 American Society of Civil Engineers.

Original languageEnglish
Article number04015070
Number of pages15
JournalJournal of composites for construction
Volume20
Issue number3
DOIs
Publication statusPublished - Jun 2016

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