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Which of the following compositions of compounds bears the maximum portion of Bogue's compounds present in ordinary Portland cement?

  • A.\(\text{C}_3\text{S}\) (Tricalcium silicate) and \(\text{C}_3\text{A}\) (Tricalcium aluminate)
  • B.\(\text{C}_3\text{S}\) (Tricalcium silicate) and \(\text{C}_2\text{S}\) (Dicalcium silicate)
  • C.\(\text{C}_3\text{A}\) (Tricalcium aluminate) and \(\text{C}_2\text{S}\) (Dicalcium silicate)
  • D.\(\text{C}_3\text{A}\) (Tricalcium aluminate) and \(\text{C}_4\text{AF}\) (Tetracalcium aluminoferrite)

Answer: B

Tricalcium silicate (C3S, about 40 to 50 percent) and dicalcium silicate (C2S, about 25 to 30 percent) together make up the greatest part, around 70 to 75 percent, of ordinary Portland cement. They are responsible for its strength. Tricalcium aluminate (C3A) is about 8 to 12 percent and tetracalcium aluminoferrite (C4AF) is about 8 to 12 percent, so any combination that includes one of those two is smaller. Hence the C3S and C2S pair has the largest share.

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