A modified one-sided technique is proposed for Rayleigh wave (R-wave) velocity measurement
in concrete. Wave scattering from material heterogeneity and near-field effects may
disrupt sensed R-wave signals in concrete, which is manifested as signal dispersion. Conventional
one-sided measurement techniques for concrete do not consider dispersion of
R-waves. In this study, the maximum energy arrival concept is adopted to determine the
wave velocity by employing continuous wavelet transform. Experimental and numerical
studies are performed to show the effectiveness of the proposed method. The method is
applied to monitor the strength development of early-age concrete exposed to various curing
conditions. Results reveal that the proposed method can be effectively used to measure
the R-wave velocity in concrete structures and further to monitor the development of compressive
strength in early-age concrete, regardless of the concrete moist curing condition.
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