With growing concern about aging of the infrastructure, efficient maintenance is becoming increasingly important. We propose a non-destructive testing method based on velocity dispersion analysis of laser ultrasonic waves for non-contact and quantitative inspection of concrete structures. This article outlines the proposed method and then reports experiments for detecting internal defects in concrete such as voids or delamination. Experiments have been conducted to examine the feasibility of the method. Three kinds of specimens were used for the experiments: concrete incorporating Styrofoam to simulate voids, concrete cracked in compressive test, and steel plate reinforced concrete with delamination. The experimental results verified that internal defects can be detected and their depths accurately estimated.
展开▼
