Multi-Bandwidth Wavelet Transform of Impact Echo Signals for Delamination Detection of Thin Concrete Slabs
In this study, a multi-bandwidth wavelet transform of signals with mixed frequencies from multiple delamination mechanisms is proposed to achieve the time and frequency resolution required in delamination detection. It was applied to detect six embedded defects, simulating shallow and deep delamination, in a 60 in. x 36 in. x 7.25 in. reinforced concrete slab from impact echo signals recorded at 40 points using a portable seismic property analyzer. Test results indicated that the proposed transform successfully detected all the defects and was twice as accurate as Fourier transform for the identification of resonant frequencies. Out of the 40 measurement points, the false detection points were reduced from 22 with Fourier transform to 10 with the proposed transform.
H. Qu et al., "Multi-Bandwidth Wavelet Transform of Impact Echo Signals for Delamination Detection of Thin Concrete Slabs," Journal of Civil Structural Health Monitoring, vol. 6, no. 4, pp. 649-664, Springer Verlag, Sep 2016.
The definitive version is available at https://doi.org/10.1007/s13349-016-0187-2
Civil, Architectural and Environmental Engineering
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Concrete slab; Fourier transform; Impact echo signal; Time-varying frequency resolution; Wavelet transform; Bandwidth; Concretes; Defects; Delamination; Natural frequencies; Reinforced concrete; Delamination detections; Embedded defects; Measurement points; Multiple delaminations; Seismic properties
International Standard Serial Number (ISSN)
Article - Journal
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