High strength ordinary portland cement, on water curing gains faster than OPC types and its ultimate strength is also higher. It is used for Structural Concrete, Prestressed Concrete, Bridges, Tunnels etc.  This cement should not have Loss on Ignition of more than 4 % compared to OPC 5% maximum.

Specific surface sq cm /gms (minimum)

3500

Initial (Maximum) (in minutes)

30 

600

10

Heat of hydration

7days (minimum)

28 days (maximum)

--

--

Compressive str. Mpa

Min. at               7 days

                       28 days

33

43

6

3

Insoluble residue(%)(max.)

2

Loss on ignition(%) (max.)

4