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Computers and Concrete
  Volume 20, Number 3, September 2017 , pages 257-262

Guided wave analysis of air-coupled impact-echo in concrete slab
Hajin Choi and Hoda Azari

    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.
Key Words
    concrete; concrete technology; non-destructive tests (NDT); structural health monitoring (SHM); structural safety
Hajin Choi and Hoda Azari: Federal Highway Administration, 6300 Georgetown Pike, McLean, Virginia, 22101, USA

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