Characterizing concrete surface notch using Rayleigh wave phase velocity and wavelet parametric analyses. (1st April 2017)

• Record Type: Journal Article
• Authors: Lee, Foo Wei; Chai, Hwa Kian; Lim, Kok Sing
• Is Part Of: Construction & building materials. Volume 136(2017)
• Page Start: 627
• Page End: 642
• Publication Date: 2017-04-01
• Subjects: Reinforced-concrete -- Surface notch -- Rayleigh wave -- Wavelet transform -- Phase velocity -- Notch depth and inclination; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2016.08.145
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A multichannel method is used to characterize surface notch depth and the orientation. MFCE technique is applied to process simulation and experiment waveforms. Wavelet transform technique is proposed to analyse R-wave waveform. Dispersion curve is plotted to study the change of R-wave phase velocity. Abstract: A multichannel Rayleigh wave (R-wave) measurement technique is proposed for evaluating concrete surface notches with different orientations. In this study, numerical simulations were first conducted to examine the propagation of R-waves in steel-reinforced concrete comprising of surface notch inclining at 30°, 90° and 150° against the horizontal plane. The change of R-wave amplitude was obtained through analysis by wavelet transform (WT) and fast Fourier transform (FFT) for determining theirs correlations with the notch depth-to-wavelength ratio. Experimental measurements on concrete samples were then carried out to validate the proposed technique and its performance, particularly for cases where notch depth is greater than R-wave wavelength. Good agreement was found between the experimental results and the numerical calculations, offering good possibility for using R-waves to assess vertical and inclined surface notches in reinforced concrete with the proposed technique for R-waves acquisition and analysis.