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http://dx.doi.org/10.12989/cac.2017.20.3.257

Guided wave analysis of air-coupled impact-echo in concrete slab  

Choi, Hajin (Federal Highway Administration)
Azari, Hoda (Federal Highway Administration)
Publication Information
Computers and Concrete / v.20, no.3, 2017 , pp. 257-262 More about this Journal
Abstract
This study aims to develop a signal processing scheme to accurately predict the thickness of concrete slab using air-coupled impact-echo. Air-coupled impact-echo has been applied to concrete non-destructive tests (NDT); however, it is often difficult to obtain thickness mode frequency due to noise components. Furthermore, apparent velocity in concrete is a usually unknown parameter in the field and the thickness of the concrete slab often cannot be accurately measured. This study proposes a signal processing scheme using guided wave analysis, wherein dispersion curves are drawn in both frequency-wave number (f-k) and phase velocity-frequency ($V_{cp}-f$) domains. The theoretical and experimental results demonstrate that thickness mode frequency and apparent velocity in concrete are clearly obtained from the f-k and $V_{cp}-f$ domains, respectively. The proposed method has great potential with regard to the application of air-coupled impact-echo in the field.
Keywords
concrete; concrete technology; non-destructive tests (NDT); structural health monitoring (SHM); structural safety;
Citations & Related Records
Times Cited By KSCI : 11  (Citation Analysis)
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