STANDARD
- IS: 4031 (Part 1)1996.
OBJECTIVE
- To determine the Fineness of cement by dry sieving
APPARATUS
- 90 microns IS Sieve.
- Balance of capacity 500 grams and sensitivity 0.01 gram.
- Nylon brush or pure bristle, preferably with 25 to 40 mm bristle, for cleaning the sieve.
PROCEDURE
- Take representative sample of 10 grams (R1) of cement from the specified lot
- Agitate the sample of cement to be tested by shaking for 2 minutes in a stoppered jar to disperse agglomerates wait 2 minutes and stir the resulting powder gently using a clean dry rod in order to distribute the fines throughout the cement.
- Fit the tray under the sieve and place the sample on the sieve.
- Fit the lid over the sieve, agitate the sieve by swirling, planetary and linear movement until no more fine material passes through it, Remove and weigh the residue (R 2).
- Express its mass as a percentage of the total quantity.
- Gently brush all the fine material of the base of sieve in to the fray.
- Make at least two determinations for each test.
CALCULATIONS
Fineness of cement, (%) = (R2 / R1) x100
R1 = Weight of sample taken.
R2 = Weight of residue after sieving.
REPORT
- Report the individual and the mean results the nearest 0.1 percent
- When the results differ by more than one percent absolute, carry out a third sieving and calculate the mean of the results.
PRECAUTIONS
- Care shall be taken while sieving to avoid spilling of cement from the sieve.
- Sieving shall be carried out manually by a skilled and experienced labour.
DETERMINATION OF FINENESS BY DRY SIEVING
IS:4031 (Part 1)1996
Grade of Cement : Date of testing :
Batch No :
| Description | Units | Test I | Test 2 | Average |
| Weight of the sample (R1) | gins | |||
| Weight of residue after sieving (R2) | gins | |||
| Fines of cement = ( R2/R1 ) x 100 | % | |||
| Specified Limit: 10% (Maximum) | ||||
| Remarks: | ||||