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Ordinary Portland cement

Description

Ordinary portland cement (OPC ) is a hydraulic cement produced by pulverizing clinker consisting essentially of hydraulic calcium silicates, usually containing one or more of the forms of the calcium sulfate as an interground addition.

Applications

Ordinary Portland cement (type I) is for use when the special properties specified for any other type are not required.

Chemical specification

The product is conforming to ASTMC 150 specifications as follows:

Magnesium Oxside (Mgo) max%
6
Sulfur Trioxside (So3) max%

When C3A is 8% or less
3
When C3A is more than 8%

3.5
Loss on ignition max%
3
Insoluble residue max%
0.75




Physical specification

The product is conforming to the American Standards. ASTMC 150 requirement as follows:

Air Content of Morter volume %
Max 12
Fineness, Specific surface, M2/kg by air per meability test to minimum
280 M2/kg
Autoclave expansion max %
0.8



Strength not less than the values shown for the ages indicated as follows:

3 Days

12 (1740)

7 Days19 (2760)



Time of setting using vicat test:

Initial set, not less than
45 minutes
Final set, not more than
375 minutes