Abstract
An experimental method was proposed for evaluating the modes I+II fracture toughness of CF/concrete adhesive interface. The validity of the evaluation formula was confirmed by numerical analysis using the finite element method. The mixed mode fracture toughness decreased remarkably by increasing the mode I component. The microscopic crack path was not in the adhesive interface but in the concrete. However, the fracture toughness of CF/concrete adhesive interface almost corresponded to that of steel/steel adhesive interface.
