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Q: How is coloured cement produced?
  • A. By adding gypsum or ordinary cement
  • B. By reducing lime content in cement
  • C. By mixing pigments with ordinary cement
  • D. By using oil fuel instead of coal for burning cement
Correct Answer: Option C - Coloured cement – Coloured cement are made by grinding 5 to 10% of suitable pigments with white or ordinary grey Portland cement. • Chromium oxide – Green • Cobalt – Blue • Iron oxide – Red, brown, yellow • Manganese dioxide – Deep brown.
C. Coloured cement – Coloured cement are made by grinding 5 to 10% of suitable pigments with white or ordinary grey Portland cement. • Chromium oxide – Green • Cobalt – Blue • Iron oxide – Red, brown, yellow • Manganese dioxide – Deep brown.

Explanations:

Coloured cement – Coloured cement are made by grinding 5 to 10% of suitable pigments with white or ordinary grey Portland cement. • Chromium oxide – Green • Cobalt – Blue • Iron oxide – Red, brown, yellow • Manganese dioxide – Deep brown.