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Which clinker compound is chiefly responsible for strength gained after about 28 days?

  • A.dicalcium silicate
  • B.tricalcium silicate
  • C.tricalcium aluminate
  • D.gypsum added at grinding

Answer: A

Its slow hydration continues for months, which is why concrete keeps gaining strength long after it is placed. The two silicates together account for most of the strength of the cement. Their proportions can be adjusted to suit the intended use.

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