Title:
Concrete Subsurface Crack Characterization by Means of Surface Rayleigh Wave Method
Author(s):
Foo Wei Lee, Hwa Kian Chai, Kok Sing Lim, and See Hung Lau
Publication:
Materials Journal
Volume:
116
Issue:
1
Appears on pages(s):
113-123
Keywords:
amplitude; excitation frequency; Rayleigh wave; reinforced concrete; subsurface crack; velocity
DOI:
10.14359/51710967
Date:
1/1/2019
Abstract:
A multichannel linear array Rayleigh wave (R-wave) methodology is studied for evaluating subsurface cracks on concrete. Numerical simulations were first conducted to understand the propagation of R-waves in steel-reinforced concrete comprising subsurface cracks with different depths and lengths followed by a series of experimental measurements on concrete samples with induced artificial subsurface cracks. The changes in R-wave amplitude and velocity were analyzed to obtain correlations with the crack depth-to-wavelength/length-to-wavelength ratio. Results revealed that the difference between the estimated and actual characteristics of subsurface cracks (crack length and depth) was less than ±20%, showing a possibility for using R-wave methodology to assess subsurface cracks in reinforced concrete with the proposed acquisition, extraction, and analysis methodology.
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