Identification of Delamination in Concrete Slabs by SIBIE Procedure

12th International Conference on Damage Assessment of Structures

Yamada, M.^1 ; Yagi, Y.^1 ; Ohtsu, M.^2

Fuji P. S. Corporation, Tokyo, Japan^1

Graduate School of Engineering, Kyoto University, Kyoto, Japan^2

关键词: Defects in concrete;    Frequency spectra;    Impact echo methods;    Non destructive testing;    Peak frequencies;    Reasonable accuracy;    Spectral amplitude;    Time of flight;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/842/1/012036/pdf
DOI  :  10.1088/1742-6596/842/1/012036

来源: IOP

【 摘 要 】

The Impact-Echo method is known as a non-destructive testing for concrete structures. The technique is based on the use of low-frequency elastic waves that propagate in concrete to determine the thickness and to detect internal flaws in concrete. The presence and locations of defects in concrete are estimated from identifying peak frequencies in the frequency spectra, which are responsible for the resonance due to time-of-flight from the defects. In practical applications, however, obtained spectra include so many peak frequencies that it is fairly difficult to identify the defects correctly. In order to improve the Impact-Echo method, Stack Imaging of spectral amplitudes Based on Impact-Echo (SIBIE) procedure is developed as an imaging technique applied to the Impact-Echo data, where defects in concrete are identified visually at the cross-section. In this study, the SIBIE procedure is applied to identify the delamination in a concrete slab. It is demonstrated that the delamination can be identified with reasonable accuracy.