In this study, paying attention to the Kadokake (small delamination along the crack) caused by repeated wheel load acting on the road bridge slab, we devised a method to evaluate the load bearing performance by grasping the number of Kadokake detected by AI. We acquired images during the degradation process in the wheel load running test and obtained the number of Kadokake in the image and compared it with the crack density. As a result, the increasing tendency of the crack density and the number of Kadokake changed during the test, but it was found that the number of Kadokake changed at an earlier stage than the crack density. Therefore, this method have validity and can be applied as the method which evaluate load bearing performance.
