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Q: Which is not the basic component of cement?
  • A. CaO
  • B. Al₂O₃
  • C. Fe₂O₃
  • D. CO₂
Correct Answer: Option D - The three constituents of hydraulic cements are lime, silica and alumina. In addition, most cements contains small proportions of iron oxide, magnesia, sulphur trioxides and alkalis. • The basic components or chemical component of cement is– Chemical component Composition CaO 60-65% SiO₂ 17-25% Al2O₃ 3-8% Fe2O₃ 0.5-6% MgO 0.5-4% Na₂O + K₂O 0.5-1.3% SO₃ 1-2%
D. The three constituents of hydraulic cements are lime, silica and alumina. In addition, most cements contains small proportions of iron oxide, magnesia, sulphur trioxides and alkalis. • The basic components or chemical component of cement is– Chemical component Composition CaO 60-65% SiO₂ 17-25% Al2O₃ 3-8% Fe2O₃ 0.5-6% MgO 0.5-4% Na₂O + K₂O 0.5-1.3% SO₃ 1-2%

Explanations:

The three constituents of hydraulic cements are lime, silica and alumina. In addition, most cements contains small proportions of iron oxide, magnesia, sulphur trioxides and alkalis. • The basic components or chemical component of cement is– Chemical component Composition CaO 60-65% SiO₂ 17-25% Al2O₃ 3-8% Fe2O₃ 0.5-6% MgO 0.5-4% Na₂O + K₂O 0.5-1.3% SO₃ 1-2%