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Hydrophobic cement is produced by

  • A.removing all of the gypsum from the ground mixture
  • B.burning the clinker in a strongly reducing atmosphere
  • C.adding a large quantity of very fine sand to it
  • D.coating the particles with a water-repellent film

Answer: D

The film protects the cement from moisture during storage and is broken during mixing. It is useful where cement must be stored for long periods in humid conditions. The protection lasts through storage but not through mixing.

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