Detecting thickness and default of concrete by impact-echo method

Impact-Echo Method is a new ultrasonic testing technique. It is a method of detecting default position of concrete based on transient stress wave propagation generated by steel ball or hammer that impacts on the surface of specimen. A displacement transducer located close to the impact point is to monitor the surface displacements caused by the arrival of the reflected waves. The analysis of displacement waveform can be performed in the time domain or in the frequcncy domain that can be used to locate default in concrete structures. The use of impact-echo method for non-destructivc testing of thickness and flaws of concrete was discussed in this paper. A in-suit test for the construct of concreta by the impact-echo method was made.