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None of the following is measured by the soundness test except

  • A.the setting time of the cement
  • B.the fineness of the ground cement
  • C.the compressive strength at 28 days
  • D.expansion caused by free lime or magnesia

Answer: D

Correct answer: expansion caused by free lime or magnesia

The soundness test measures delayed expansion from free lime or magnesia, which hydrate long after the concrete has hardened and disrupt it. Setting time, fineness and compressive strength are each measured by their own separate tests, and none of them would reveal a fault that only appears weeks or months after placing.

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