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Autogenous shrinkage differs from drying shrinkage in that it occurs

  • A.without any moisture being lost to the surroundings
  • B.only after the concrete has completely dried out entirely
  • C.solely as the result of a change in ambient temperature
  • D.only in a concrete that contains no cement whatsoever

Answer: A

The hydration products occupy less volume than the cement and water they replace, so the paste contracts even when sealed. It is most significant in low water to cement ratio mixes, where there is little free water to buffer it.

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