抄録
The ultrasonic test (UT) has been conventionally applied to estimate a surface-crack depth in concrete. A test method is based on the time-of-flight of a diffracted wave via a crack tip. It is reported that the depth is mistakenly estimated in the case that water is filled in the crack. In order to visualize a location of an internal defect in concrete, SIBIE procedure has been developed. In the present study, the SIBIE procedure is applied to estimate the depth of surface-cracks, which are artificially made in concrete samples. SIBIE results are compared with those of the conventional UT results. It is found that the depth estimation is marginally available in the UT measurement, while the SIBIE procedure could visually show the depths of a surface-crack, separating the effect of water surface.
