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A retarding admixture is useful when

  • A.the concrete must gain strength within hours
  • B.the aggregate is unusually fine
  • C.the formwork is to be struck immediately
  • D.placing large pours or working in hot weather

Answer: D

Delaying the set keeps the concrete workable long enough for a large pour to be placed without a cold joint. High temperatures accelerate hydration, so the need is greatest in exactly the conditions that shorten the time available.

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