DETERMINATION OF FINENESS OF MICROSILICA
Test standard : IS 1727:1967
Test Appratus :
- 45µ IS Sieve
- Weighing balance of accuracy 0.1%
- Hot air oven
Test Procedure :
- Take 100 gms of sample (say W1, gms) , Sample shall be prepared by quartering method.
- Place it over the 45micron IS Sieveand Wash the material by jet of water & keep it well agitated.
- The washing shall continue till it appears no more turbid. Dry the sieve and the residue in a oven. Brush the residue from the sieve after drying and weigh on a weighing balance (say W2, gms)
Particle retained (R) on 45µ IS Sieve (%) = (W2/W1) x 100Test result shall be reported to the nearest 0.1%
Variation from average:
Variation from average:
Test ten samples of microsilica & measure the particle retained on 45µ IS Sieve (%) of each sample, calculate the average of ten samples & report the result to the nearest 0.1% (Ravg)
Variation from the average shall be calculated as = ±{(R-Ravg)/Ravg) x 100
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