In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Characterization of Deep Surface-Opening Cracks in Concrete: Feasibility of Impact-Generated Rayleigh-Waves
Author(s): Hwa Kian Chai, Shohei Momoki, Dimitrios G. Aggelis, and Tomoki Shiotani
Publication: Materials Journal
Appears on pages(s): 305-311
Keywords: amplitude factor; attenuation; nondestructive testing; Rayleigh waves; surface-opening cracks
Abstract:The feasibility of impact-generated Rayleigh waves (R-waves) for measuring deep surface-opening cracks in concrete structures was studied. The aim is to contribute to a methodology for simple and effective in-place crack depth estimation. Specimens induced with vertical slits of different depths were prepared for measurement. A two-sensor array was implemented and elastic waves of different central frequencies were generated by mechanical impacts with steel- ball hammers of different ball diameters. R-wave amplitudes were extracted from the waveforms. Attenuation of R-waves due to diffraction and scattering by the slits and the trend of amplitude decaying with slit depth were examined. A reasonable correlation between the amplitude factor and slit depth-to-wavelength ratio was established, which indicated the loss of sensitivity in the change of amplitude factor with regard to dominant wavelengths smaller than the slit depth. By comparing the results of P-wave time-offlight (TOF) method, the results by measuring again using the proposed method confirmed the feasibility of R-wave attenuation as an alternative parameter for characterizing surface-opening cracks. In addition, it was also demonstrated potential problems associated with the reliability of P-wave TOF method in estimating a crack with limited length.
Click here to become an online Journal subscriber