search
arrow-left Previous
Next arrow-right
Q: For the manufacture of Portland cement the proportions of raw material used are ...........
  • A. lime 63%; silica 22%; other ingredients 15%
  • B. lime 22%; silica 63%; other ingredients 15%
  • C. silica 40%; lime 40%; other ingredients 40%
  • D. silica 70%; lime 20%; other ingredients 20%
Correct Answer: Option A - The manufacture of portland cement the proportions of raw material are lime (cal) – 60 to 65% – Average 63. Silica (SiO₂) – 12 to 25%– Average 22% Other ingredients 15% . Lime is a main part of the cement. It is a binding material It react with water and make the calcium silicate & aluminates. It impart the strength excesses of silica in cement. It quick hardened property.
A. The manufacture of portland cement the proportions of raw material are lime (cal) – 60 to 65% – Average 63. Silica (SiO₂) – 12 to 25%– Average 22% Other ingredients 15% . Lime is a main part of the cement. It is a binding material It react with water and make the calcium silicate & aluminates. It impart the strength excesses of silica in cement. It quick hardened property.

Explanations:

The manufacture of portland cement the proportions of raw material are lime (cal) – 60 to 65% – Average 63. Silica (SiO₂) – 12 to 25%– Average 22% Other ingredients 15% . Lime is a main part of the cement. It is a binding material It react with water and make the calcium silicate & aluminates. It impart the strength excesses of silica in cement. It quick hardened property.