Fineness

1. Sample details

Description of material Brand / Source Location Date of sampling Date of testing Tested by Cement type

Density, ρ (g/cc) Sample weight, m = 0.5 × ρ × V (g) Apparatus constant, K Air-permeability time, T1 (s) Air-permeability time, T2 (s)

Specific surface, S —

Conformity —

S (m²/kg) = [521.08 × K × √T] / ρ / 10

Back-calculation — expected T2 for a target permeability time

Given T1 and the average permeability time you're targeting, solves for the T2 reading that would produce it.

Target average time, T (s) Required T2 (given T1 above)

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