title: Assessment of Reinforced Concrete Surface Breaking Crack Using Rayleigh Wave Measurement.
abstract: An improved single sided Rayleigh wave (R-wave) measurement was suggested to characterize surface breaking crack in steel reinforced concrete structures. Numerical simulations were performed to clarify the behavior of R-waves interacting with surface breaking crack with different depths and degrees of inclinations. Through analysis of simulation results, correlations between R-wave parameters of interest and crack characteristics (depth and degree of inclination) were obtained, which were then validated by experimental measurement of concrete specimens instigated with vertical and inclined artificial cracks of different depths. Wave parameters including velocity and amplitude attenuation for each case were studied. The correlations allowed us to estimate the depth and inclination of cracks measured experimentally with acceptable discrepancies, particularly for cracks which are relatively shallow and when the crack depth is smaller than the wavelength.
authors.affiliation: Department of Civil Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia. ah_foo3@hotmail.com.
authors.forename: Foo Wei
authors.initials: FW
authors.lastname: Lee
authors.affiliation: Department of Civil Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia. hkchai@um.edu.my.
authors.forename: Hwa Kian
authors.initials: HK
authors.lastname: Chai
authors.affiliation: Department of Physics, University of Malaya, Kuala Lumpur 50603, Malaysia. kslim@um.edu.my.
authors.forename: Kok Sing
authors.initials: KS
authors.lastname: Lim
keywords: amplitude index; excitation frequency; reinforced concrete; surface Rayleigh wave; surface breaking crack; velocity index