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Q: The minimum percentage of chemical ingredient of cement is that of ..........
  • A. magnesium oxide
  • B. Iron oxide
  • C. alumina
  • D. lime
Correct Answer: Option A - The minimum percentage of chemical ingredient of cement is that of magnesium oxide – 0.1 to 4%. • Iron oxide – 0.5 to 6%. They impart the cement brown colour and strength the excess of iron in cement decreased the strength. • Alumina – 3 to 8% – quick setting the cement. • Lime – 60-67% – It's act as a binding material and main part of the cement.
A. The minimum percentage of chemical ingredient of cement is that of magnesium oxide – 0.1 to 4%. • Iron oxide – 0.5 to 6%. They impart the cement brown colour and strength the excess of iron in cement decreased the strength. • Alumina – 3 to 8% – quick setting the cement. • Lime – 60-67% – It's act as a binding material and main part of the cement.

Explanations:

The minimum percentage of chemical ingredient of cement is that of magnesium oxide – 0.1 to 4%. • Iron oxide – 0.5 to 6%. They impart the cement brown colour and strength the excess of iron in cement decreased the strength. • Alumina – 3 to 8% – quick setting the cement. • Lime – 60-67% – It's act as a binding material and main part of the cement.