Abstract
In this paper, a method to estimate the crack height in concrete structures by ultrasonic testing is investigated. This method is based on the relation between the crack height and the maximum echo amplitude obtained from the received wave. In the beginning, a regressive equation for estimating the crack height is developed from the experiments for specimens with slits. Next, the reflection of incident wave at the bottom surface of structures is investigated on the influences on the echo amplitude of received wave. From these results, it is confirmed that the proposed method is applicable to actual cracks in concrete structures.
