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Temperature affects the rate of hydration such that concrete cured warm

  • A.gains strength faster and ends higher as well
  • B.gains strength more slowly at every age
  • C.shows no difference at any age at all
  • D.gains strength faster early but may end lower

Answer: D

Rapid early hydration produces a coarser and less uniform gel, so the ultimate strength can be below that of concrete cured cool. It is one of the few cases where going faster leaves you worse off in the end. Steam-cured precast units are designed with this trade in mind.

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