The present study designed four self-anchored in-plane iosipescu shear tests to investigate the interfacial bonding property of hybrid bonding CFRP. According to the interfacial shear stress development trend

this study divided the destruction process of the carbon fiber sheets in hybrid bonding CFRP from the initial force to the final destruction into three stages. Considering the different paste lengths of the carbon fiber sheets in the tests

this paper analyzed the failure mode

destruction process

and the interfacial bonding property in the tests. This study shows that the steel sheet-fastenings in hybrid bonding CFRP improve the bonding strength of CFRP-concrete interface. It makes the failure mode change from carbon fiber sheets debonding failure to carbon fiber sheets fracture failure. As a result

it improves the use ratio of the strength of carbon fiber sheets tremendously. The interfacial bonding property of the carbon fiber sheets is stable at the non-debonding stage of the carbon fiber sheets. The steel sheet-fastenings have a few impacts on the initial debonding of the carbon fiber sheets. In the continual debonding process of the carbon fiber sheets

the steel sheet-fastenings can delay the debonding of the carbon fiber sheets and increase the interfacial bonding strength by 18.02%.