Abstract
Different types of grouting mortar have been developed and used for a pipe renewal method. Material experiments for the grouting mortar were performed to evaluate the fracture properties. The fracture mechanical parameters such as the specific fracture energy and the tension softening diagram were analyzed from the load-displacement curves measured using rectangular notched specimens and wedge-splitting procedures. Fracture parameters of the grouting mortar with different materials and mix proportions were compared and discussed. The results showed that the fracture behavior of the grouting mortar was much influenced with the type of fine aggregates. Based on the experimental and analytical data, the tension-softening diagram of the grouting mortar was proposed and applied to numerical analyses of the wedge-splitting test specimens to investigate the applicability of the model. The analytical results were compared with the experimental results, and the reliability of the tension-softening diagram was examined. It was concluded that the tension-softening diagram proposed was useful for the fracture analysis of the mortar.
