Abstract
This study investigates surface waves propagating across a partially closed surface-breaking crack in concrete. The experimental program includes three concrete specimens and three test phases. In the first and second test phases, effects of compression and bending on the transmission ratio and phase velocity of surface waves were investigated in crack-free specimens. In the third phase, the surface wave parameters were measured on the specimens with a surface-breaking crack when a compressive load was applied to partially close the crack. Experimental results showed that both the wave transmission and velocity are sensitive to the compressive load when the crack is gradually closed. Variations of the surface wave parameters are presented with the compressive and tensile loads, and crack mouth opening displacement (CMOD). Findings in this study will provide useful information for studying stress wave propagation across a partially closed crack and for applying the surface wave based nondestructive testing methods to actual concrete structures.
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