Research on Internal Damage Estimation of Concrete Structure Using Ultrasonic Testing Technique

Abstract

　　　In this study, in order to clarify the possibility of internal damage in concrete structures, shear tests and ultrasonic testing technique were conducted on normally concrete materials and PIC construction concrete. In addition, the correlation between the internal damage condition of the concrete and the ultrasonic signal was investigated. As a result, a correlation was obtained between the damage state inside the concrete and the sound pressure and sound velocity of ultrasonic waves. It was clarified that the damage condition inside concrete can be estimated by evaluating sound pressure and sound velocity. Furthermore, it is suggested that the ultrasonic testing technique could be used to detect the damage of the concrete before it appears on the material surface.