TESTING OF CEMENT IN LABORATORY

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Laboratory Tests For Cement

The followings are the most recognized methods for testing of cement in laboratory. 1. Chemical

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Composition Test

Lime Saturation Factor (LSF) can be defined as the ratio of percentage of lime to percentage of silica, alumina and iron oxide. At the time of being computed with the formula, it should not be in excess of 1.02 and not below 0.66. Ratio of percentage of alumina (al2O3) to that of iron oxide (Fe2O3) should not be lower than 0.66 Weight of insoluble residue should not be in excess of 4 per cent. Weight of Magnesia should not be in excess of 6 per cent Total loss on ignition should not be in excess of 5 per cent. Total sulphur content measured as sulphuric anhydride should not be in excess of 2.5% while C3A is 5% or less and should not be 3% when C3A is more than 5%

2. Normal

Consistency Test

The normal (standard) consistency of a cement paste means the consistency that will allow a Vicat plunger with 10 mm diameter and 50 mm length to go through a depth of 33 to 35 mm from the top (or 5 to 7 mm from the bottom) of the mould.

Vicat Apparatus: Vicat apparatus assembly comprises a plunger 300 gm in weight having a length of 50 mm and diameter of 10 mm and a mould which is 40 mm deep and 80 mm in


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