Building Materials
Name the type of cement from the following for canal linings:

Rapid hardening cement
Quick setting cement
Pozzolana cement
Sulphate resisting cement

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Building Materials
Asbestos

All of these
Contains iron oxide and alumina
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Is a natural fibrous mineral substance

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

All listed here
No grey or white deposits appear on the surface, the brick is free from soluble salts
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence

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