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Concrete continues to gain strength for months after it has set because of the slow hydration of

  • A.the gypsum ground in with the clinker
  • B.the free lime left uncombined in the clinker
  • C.dicalcium silicate
  • D.tricalcium aluminate

Answer: C

The silicates hydrate at very different rates, and the dicalcium form is still reacting long after the tricalcium has finished in the first week. Its low heat of hydration is also why a low-heat cement is made rich in it.

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