The proper maintenance and renovation of existing concrete structures for irrigation and drainage are social problems and the importance of non-destructive tests which assess the wholesomeness of these structures has been increasing. In this study, the development of microphone covers, impacter and time-frequency analysis using wavelet transform is carried out for the improvement of the impact acoustic method. This method was applied to concrete models with different thicknesses and those with different sizes of cavities at different depths in order to examine the influence on the impact sounds. The test results showed that peak frequencies change according to the thickness of the models and that the influence of the cavity appears clearly in the maximum amplitude. In addition, analytical examination of the tests showed that it is possible to reproduce the results of concrete models using finite element method.
|Translated title of the contribution||Quantitative evaluation for thickness and cavity of concrete models by impact acoustic method|
|Pages (from-to)||797 - 805|
|Number of pages||9|
|Journal||Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering|
|Publication status||Published - 2003|