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An ultrasonic pulse velocity test on concrete is used chiefly to

  • A.assess uniformity and detect internal voids
  • B.measure the yield strength of the reinforcement embedded within the member
  • C.determine the exact compressive strength of the concrete without taking cores
  • D.establish the depth of carbonation from the exposed surface inwards

Answer: A

A low or erratic velocity points to honeycombing, cracking or delamination, which matters greatly in a member that is to be relied on. The absolute strength still requires cores, since velocity depends on the mix as much as on its quality.

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