Abstract
A non-destructive testing method of concrete using impact acoustics induced by hammering on the surface of concrete structures was studied in this paper. The impact acoustics, which has strong relation with the vibration of concrete surface, can offer important information about the properties and the defects of the concrete structures. However the study related to this method has not been done sufficiently, although it is often used in the inspection of concrete structures.
The relation between impact acoustics emitted from the surface of the concrete and the vibration at the same surface of the concrete was observed experimentally. Then some basic experiments were carried out to clarify the influence of defects like cracks and delaminations on amplitude and resonant frequency of impact acoustics. These experimental results are compared with the results of FEM analysis. And flow chart for judging the existence of flaws are also proposed in this paper.
