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Tricalcium silicate, the principal strength-giving compound of Portland cement, is abbreviated as

  • A.C3A
  • B.C4AF
  • C.C3S
  • D.C2S

Answer: C

In cement chemists' notation C stands for calcium oxide and S for silica, so C3S is three parts lime to one of silica. It usually makes up around half of the clinker. The abbreviations are a shorthand used throughout the cement industry.

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