REQUIREMENTS OF QUALITY CEMENT

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Cement should have a uniform colour.
Cement should be free from lumps.
It should be smooth and uniform. As a test, if a small quantity of cement is thrown in water, it should sink completely.
The ratio ≮ oxide should not be less than 0.66 in cement.
The total sulphur content in cement should not be greater than 2.75%.
Magnesia content in cement should not exceed 5% by weight.
Insoluble residue in cement should not be greater than 1.5% by weight.
Cement should not lose more than 4% of its weight when heated.
The specific surface of cement as found from the fineness test should not be less than 2,250 mm²/gm.
The initial setting of cement should be about 30 minutes, and the final setting time should be about 10 hours.
Expansion of cement should not be greater than 10 mm in a soundness test.

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