Multi-Bandwidth Wavelet Transform of Impact Echo Signals for Delamination Detection of Thin Concrete Slabs

Abstract

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.

Department(s)

Civil, Architectural and Environmental Engineering

Second Department

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)

2190-5452

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 Springer Verlag, All rights reserved.

Publication Date

01 Sep 2016

Link to Full Text

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