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The specific gravity of Portland cement is approximately

  • A.2.4
  • B.7.8
  • C.3.15
  • D.1.0

Answer: C

Correct answer: 3.15

Portland cement has a specific gravity of about 3.15, and the figure is used constantly in mix design to convert masses into the absolute volumes that must sum to a cubic metre. It is a property of the solid particles, quite distinct from the bulk density of about 1440 kg per cubic metre, which includes the air between them.

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