Abstract
Peeling of a concrete layer adjacent to the adhesive is a common failure mode in carbon-fibre-reinforced polymer (CFRP) sheet-strengthened concrete structures. The resistance to debonding depends on the concrete surface strength, which is often reduced by defects induced by material preparation and manual operation. In the present study, to address this issue, a resin pre-coating (RPC) treatment was employed to strengthen the concrete surface, and Kevlar fibres pretreated with the RPC were used to reinforce the adhesive layer. The effects of the interfacial treatment and bond length on the failure modes were investigated via single-lap shear tests. The results indicated that epoxy resin penetrated the defects near the concrete surface after the RPC treatment and that the adhesive layer was significantly reinforced by the fibres. To quantitatively investigate the effect of the proposed technique on the adhesive bonding, an analytical model was proposed for determining the shear strength τf and shear fracture energy GIIf by incorporating the interfacial heterogeneity and discontinuity for specimens with small bond lengths. Realistic τf and GIIf values were obtained via a normal-distribution analysis. The results indicated that the τf and GIIf values were increased by 25.1% and 21.4%, respectively, when both the RPC treatment and the fibre reinforcement were applied.
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