Question
Pick up the correct proportions of chemical ingredients of cement.
A. Silica: Lime: Alumina: Iron oxide
= 63:20:6:3
B. Lime Silica: Alumina: Iron oxide = 63:20:6:3
C. Lime Silica: Iron oxide: Alumina
= 63:20:6:3
D. Iron oxide: Alumina : Silica: Lime
= 63:20:6:3
Answer: Option B – Lime Silica: Alumina: Iron oxide = 63:20:6:3
Explanation:
Composition of Ordinary Portland cement(OPC):
- Lime: 62% – 67%
- Silica: 17% -25%
- Alumina: 3% – 8%
- Calcium Sulphate: 3% – 4%
- Iron Oxide: 3% 4%
- Magnesia: 1% – 3%
- Sulphur: 1% -3%
- Alkalis: 0.2% -1%