Steel-concrete composite structures, such as steel-concrete composite slabs and rigid connections between piers and beams, have been widely adopted in recent years due to their durability and economic efficiency. However, it is impossible to examine the boundary between steel plates and concrete visually after concrete casting because of the presence of steel plates surrounding the concrete. To solve this issue, a method to discriminate between filled and unfilled areas in concrete using low-frequency ultrasound has been developed and its application to actual bridges has commenced.
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