The fracture energy of concrete is important in the energy criterion, but its determination is very difficult by now. In this study, the determination of the fracture energy of concrete is presented with the size effect law which was recently derived for blunt fracture. If we know only maximum load when failure is occurred, not perfect load-deflection diagram, the fracture energy of concrete can be determined with ease through size effect law to make experimental test data smooth.
To find the maximum load by experiment, the three-point bending test with initial notch which is the most stable system for Mode I is used, and the geometrically similar and dissimilar specimens were tested. The results of each fracture energy are compared.
There are many factors which affect the fracture energy. For each of them, the maximum aggregate size is considered to be the most dominant, so in this paper that effect is studied.
