Research into Ultrasonic Test for Deterioration of Rebar at Loading Test for RC Beam

In this study, in order to clarify the possibility of internal damage in concrete structures, loading tests and ultrasonic testing technique were conducted on concrete materials. In addition, the correlation between the internal dama ge condition of 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 velocity of ultrasonic waves. It was clarified that the damage condition inside concrete can be estimated by evaluating sound pressure and velocity. Furthermore, it\u27s suggested that the ultrasonic testing technique could be used to detect the damage of the concrete before it appears on the surface