FINENESS TEST FOR CEMENT

FINENESS TEST OF CEMENT

OBJECT

         To determine the fineness of cement.

APPARATUS

         I.S. sieve no. 9, sieve shaker, balance with weight box.

         MATERIALS:- Test sample of cement.

     

                                                   Fig:-Showing I.S. sieve no. 9

PROCEDURE

1. Take 100 gm of test sample of cement.
2. Any air set lump of cement may be broken with fingers.
3. Put a 100 gm sample of cement in the IS sieve no. 9. Put the sieve in the sieve shaker and continuously for a period of 15 minutes.
4. The residues retain on the sieve wt. the residue and find the percentage of residue.

 RESULT

        The residue should not exceed 10 %.

PRACTICAL UTILITY

Determination of the percentage of the fineness of cement is of great importance, because the strength of cement depends upon its fineness. More the finer cement more will be quicker action with water and gain early strength, but due to this, the rate of heat of hydration increase and cracks are developed. If cement is not finer, the strength of cement decreases.

CALCULATION

Calculate the residue of cement R as the mean of R₁ & R₂ (or R₁, R₂ & R₃) in %, expressed to the nearest 0.1%.

PRECAUTION

§  Before sieving, air set lumps of cement should be broken

§  Sieving should be done by rotating the sieve and not by translation.