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Is it possible to detect voids below rebars using ultrasonic pulse echo?

Yes, ultrasonic pulse echo is the correct technology for detecting voids, honeycombs, and delaminations below the rebar grid. Whereas a dense rebar structure will block a GPR signal from penetrating deeper into the structure, an ultrasonic pulse echo signal is only partially reflected. The signal that passes through is able to detect deeper-lying voids.

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