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Initial setting time is measured as the interval from adding water until

  • A.the test specimen has completely dried out in the mould
  • B.the cement has been ground down to its final fineness
  • C.the Vicat needle fails to penetrate to a specified depth
  • D.the paste has reached its full ultimate compressive strength

Answer: C

It marks the point at which the paste is no longer usefully workable, so it sets a practical limit on how long concrete can be transported and placed. Final set is measured later with a different attachment. Both figures are quoted because each has a different practical meaning.

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