White and Colored Portland Cement (IS: 8042)

• Manufactured from pure white chalk and china clay free from iron oxide.

• Greyish color of cement issued to iron oxide, iron oxide limited below 1 per cent.

• Colored cements 5 to 10 per cent coloring pigments.

• Sodium alumina ferrite (cryolite) Na3ALF6 is added during burning which acts as a

catalyst in place of iron oxide.

• Hunter scale whiteness of white cement.

• Compressive and transverse strength of the cement is 90 per cent of that 33 grade

OPC:

(i) Chromium oxides gives green colour.

(ii) Cobalt imparts blue colour.

(iii) Manganese dioxide imparts black or brown.

(iv) Iron oxide gives brown colour.

• Used for making terrazzo flooring, face plaster of walls ornamental works.

Water Repellent Cement (IS: 8043) or Hydrophobic cement.

• Manufactured by grinding OPC clinker with 0.1 to 0.4% of oleic acid, stearic acid

or pentachlorophenol.

• This addition forms water repellent film around each particular of cement.

• Hydrophobic cement also features greater water resistance and water impermeability.

• Small strength gain during the initial period but its 28-day strength is equal to OPC.

• Most suitable for basements and for making watertight concrete.

3 day ± 1 hour 15.69 N/mm2

7 day ± 2 hour 21.57 N/mm2

28 day ± 4 hour 30.40 N/mm2