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AP EAMCET20225 Jul 2022Morning ShiftChemistrys Block ElementsActual

The two major constituents of Portland cement are

Options

  1. ACaO , SiO ₂
  2. BCaO , Al ₂ O ₃
  3. CSiO ₂, MgO
  4. DCaO , MgO

Correct answer

A. CaO , SiO ₂

Step-by-step solution

The portland cement consists of tricalcium silicate (3 CaO SiO ₂) , dicalcium silicate (2 CaO SiO ₂ ) , tricalcium aluminate (3 CaO Al ₂ O ₃ ) and tetra-calcium aluminoferrite (4 CaO Al ₂ O ₃ Fe ₂ O ₃ ) . Hence, the major constituent in it is CaO and SiO ₂ . The percentage of CaO 64 % and SiO ₂ is 21 % .

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