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The fineness of a cement is usually expressed as

  • A.the mass of one standard bag measured in kilograms
  • B.the initial setting time measured in minutes
  • C.the compressive strength reached at 28 days
  • D.specific surface area in square metres per kilogram

Answer: D

A finer cement presents more surface to water and so hydrates faster, which is why rapid hardening cements are ground finer. Grinding beyond a point costs more energy than the gain justifies. Grinding is among the largest electrical loads in a cement works.

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