Fineness Test on Cement

The fineness test of cement measures the mean size of the cement grain in the given sample. The greater the fineness value, the higher the surface area of each grain particle which results in an increase in the rate of hydration of cement, the rate of evolution of heat, and hence the rate of initial gain strength.
But, every cement grain must possess an optimum fineness value or else fine grinding makes cement susceptible to air setting. An increase in the fineness of cement also results in an increase in the drying shrinkage of concrete. Usually, the grain size of the cement particles is within 7 ~ 200 μm (0.007 ~ 0.2 mm).
The fineness test on cement can be conducted by two methods:
Sieve Analysis
Air-Permeability Test
1. Lea and Nurse Air Permeability Apparatus
2. Blain Air Permeability Apparatus
The determination of fineness test by sieve analysis gives a measure of the limit of residue that is regained in a standard sieve, while the air permeability test measures the fineness of cement in terms of surface area either in g/cm2 or kg/cm2
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