Special cement
Water-proof cement (hydrophobic cement)
- This type of cement is prepared by mixing with ordinary or rapid hardening cement a small percentage of some metal stearate ( Ca, Al etc.) at the time of grinding.
- This type of cement decreases the wetting ability of cement.
Properties:
- It is more resistant to penetration by water and some oils than that made from ordinary Portland cement.
- It is also adequately resistant to the corrosive action of acids and alkalies or other harmful salts usually present in industrial waters.
Uses:
- It is used for the construction of water-retaining structures like tanks, reservoirs, retaining walls, swimming pools, dams, bridges, piers etc.
White cement
- It is prepared from such raw materials which are practically free from colouring oxides of iron, manganese or chromium.
- It is white in colour.
- For burning of this cement, the oil fuel is used instead of coal.
Properties:
- It is very expensive.
- It dries quickly.
- It possesses high strength.
- It has superior aesthetic values.
- It should not set earlier than 30 min.
- It should be carefully transported and stored in a closed container only.
Uses:
- It is used for floor finish, plaster work, ornamental work etc.
- It is used in swimming pools, moulding sculptures and statues, painting garden furniture etc.
- It is also used for fixing marbles and tiles.
