Abstract
The fracture toughness KI+II of epoxy-repaired concrete considering possible kinked crack was mainly investigated in this research. Fracture tests with different specimen geometries and coarse aggregate volume contents were performed, and the values of KI+II were determined based on the modified two-parameter model and full-field deformations. The epoxy resin was used to repair the fractured concrete, and then retested in the same way. The final crack trajectories and strain field that around the initial notch tip were studied, and a comparison was made between KI+II and mode-I fracture toughness KI. Research results indicate that different crack paths are shown after using the epoxy resin to repair concrete and compared with the first fractured concrete, smaller horizontal strain damage region is presented under the same load value. Higher values of KI are shown for the epoxy-repaired concrete, which demonstrate that the crack resistance ability of concrete can be improved after repaired by the epoxy resin. In addition, greater values of KI+II are presented than KI for both the unrepaired and epoxy-repaired concrete.
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