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Q: Identify a rapid hardening cement of chocolate colour and whose field of application includes works in chemical plants and furnaces?
  • A. High alumina cement
  • B. Water-repellent portland cement
  • C. Blast furnace slag cement
  • D. Quick setting cement
Correct Answer: Option A - High alumina cement–It is a rapid hardening cement of chocolate colour. • It is manufactured from bauxite and limestone in special laboratory furnaces. It contains nearly 35% of alumina and the ratio of alumina to lime lies between 0.55 and 1.3. • It is resist the action of acid and high temperature and does not expand on setting.
A. High alumina cement–It is a rapid hardening cement of chocolate colour. • It is manufactured from bauxite and limestone in special laboratory furnaces. It contains nearly 35% of alumina and the ratio of alumina to lime lies between 0.55 and 1.3. • It is resist the action of acid and high temperature and does not expand on setting.

Explanations:

High alumina cement–It is a rapid hardening cement of chocolate colour. • It is manufactured from bauxite and limestone in special laboratory furnaces. It contains nearly 35% of alumina and the ratio of alumina to lime lies between 0.55 and 1.3. • It is resist the action of acid and high temperature and does not expand on setting.