Cement fineness — 90 µm sieve

Reduce duplicate or triplicate sieve observations with a supplied calibrated sieve factor.

Observations and units

• Cement sample mass (g)
• Residue on 90 µm sieve (g)
• Calibrated sieve factor F (ratio)

Calculation

Residue = 100 × retained mass / initial mass; corrected residue = residue × F. Mean of replicate percentages, not a ratio of pooled masses.

Method reference and limitations

IS 4031 (Part 1):1996, clauses 4.4.1–4.4.2; 5. Use the calibrated sieve factor for this sieve. Use approximately 10 g per determination. A third determination is needed when the first two uncorrected residues, expressed to 0.1%, differ by more than one percentage point. Exact arithmetic and method-stage rounded reporting are both shown; final reporting is to 0.1 percentage point. Sieve calibration is not performed here.

Calculation and reporting rules audited within the documented profile; physical test execution and specification acceptance remain the operator’s responsibility. Independent qualified review is not recorded. No certificate or compliance decision.

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