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Setting of cement differs from hardening in that setting is the

  • A.evaporation of the mixing water
  • B.carbonation of the surface by the atmosphere
  • C.loss of plasticity soon after mixing
  • D.gain of strength over weeks and months

Answer: C

Correct answer: loss of plasticity soon after mixing

Setting is the stiffening of the paste in the first hours, the point at which it ceases to be workable. Hardening is the development of strength that follows and continues for weeks and months. Both are consequences of the same hydration reactions, but they are separate stages and are measured by quite different tests.

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