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A core test on existing concrete is taken in order to

  • A.measure the surface hardness of the concrete at a large number of points quickly
  • B.measure the compressive strength directly
  • C.establish the layout of the reinforcement and the cover over it without breaking out
  • D.detect corrosion of the reinforcement at depth within the member being tested

Answer: B

Cutting a cylinder and crushing it is the only direct measurement available on a finished structure, and the result is corrected for the core's proportions and for the reinforcement it contains. Coring damages the member, so the number of cores is kept small.

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