High Alumina Cement (IS: 6452)

• Bauxite 40% limes to no 40%, 15% iron oxide.

• As Since CA is not present, suitable to sea and under-water work.

• It’s rapid hardening properties arises due to Al2O3.CaO. For setting and hardening

there is not free hydrated lime as in the case of OPC.

• Final setting 600 minutes.

• One day strength is 30N/mm2 and 3 day is 35N/mm2

• Not be used in places where temperature exceeds 180C.

• Fineness ≥ 225 m2

/Kg.

• Expansion ≤ 5mm.

• Used widely for pre-casting.

Sulphate Resisting Portland Cement (SRPC) (IS: 12330)

• It contains very low C3A.

• Expansion of cement is limited to 10 mm and 0.8 per cent, when tested by Le-

chatelier method and autoclave test, respectively.

• Setting times are same as that for ordinary Portland cement.

• Fineness of 400 m2/kg.

• Initial setting time ≤ 30 minutes and final setting time ≥ 600 minutes.

• Strongly recommended for structures in sea water.