ABSTRACT
Ultra High Performance Fiber Reinforced Composites (UHPFRC) without heat curing has been developed in recent years, and the material has been used as a repair material. In the repair applications, cracks may occur due to shrinkage of the repair material itself. In this study, the internal stress due to shrinkage of UHPFRC was measured by means of pseudo perfect constrained testing, and cracking resistance against shrinkage was discussed compared with the development of tensile cracking strength. The induced stress of used UHPFRC was 3 MPa at the age of 7days after casting. And induced stress of UHPFRC with expansive agent was reduced to be a half of that without expansive agent. Crack resistance that was represented by the ratio of induced stress to initial cracking strength can be calculated. It was about 40% at the age of 28 days, and there was enough margin to crack initiation.
