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Sensors 2018, 18(9), 2793; https://doi.org/10.3390/s18092793

Surface-Wave Based Model for Estimation of Discontinuity Depth in Concrete

1
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
2
Department of Safety Engineering, Pukyong National University, Pusan 48513, Korea
3
Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign (UIUC), Urbana, IL 61801, USA
*
Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 14 August 2018 / Accepted: 22 August 2018 / Published: 24 August 2018
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, we propose an accurate and practical model for the estimation of surface-breaking discontinuity (i.e., crack) depth in concrete through quantitative characterization of surface-wave transmission across the discontinuity. The effects of three different mixture types (mortar, normal strength concrete, and high strength concrete) and four different simulated crack depths on surface-wave transmission were examined through experiments carried out on lab-scale concrete specimens. The crack depth estimation model is based on a surface-wave spectral energy approach that is capable of taking into account a wide range of wave frequencies. The accuracy of the proposed crack depth estimation model is validated by root mean square error analysis of data from repeated spectral energy transmission ratio measurements for each specimen. View Full-Text
Keywords: surface-wave transmission; self-calibrating measurement; spectral energy transmission ratio; crack depth estimation model surface-wave transmission; self-calibrating measurement; spectral energy transmission ratio; crack depth estimation model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ahn, E.; Kim, H.; Sim, S.-H.; Shin, S.W.; Popovics, J.S.; Shin, M. Surface-Wave Based Model for Estimation of Discontinuity Depth in Concrete. Sensors 2018, 18, 2793.

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