Abstract
This paper deals with Impact Acoustics methods to identify the sizes and vertical locations of defects in concrete. In this study, the maximum amplitude and frequency distribution, those were obtained from received elastic waveforms when concrete surface was impacted, were defined as ‘Impact Acoustics indices’ for defects evaluation. Quantitative relations between the Impact Acoustics indices and defects indices were both experimentally and analytically investigated. Influences of impact locations and concrete properties on the Impact Acoustics indices were also examined. As the results, it was revealed that the Impact Acoustics parameters used were very effective for quantitative evaluation of defects with taking consideration of impact locations on a concrete surface.
