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Tricalcium aluminate is significant chiefly because it

  • A.provides most of the long-term strength gained
  • B.makes the cement highly resistant to sulphates
  • C.reduces the fineness that grinding must achieve
  • D.reacts very rapidly and generates much heat

Answer: D

Left unchecked it would cause a flash set, which is why gypsum is interground with the clinker. It is also the compound most vulnerable to sulphate attack. Low-aluminate cements are specified where sulphates are present in the ground.

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