1 Scope
This European Standard describes three methods of determining the fineness of cement.
The sieving method serves only to demonstrate the presence of coarse cement particles.
This method is primarily suited to checking and controlling the production process.
The air-jet sieving method measures the retention on sieving and is suitable for particles
which substantially pass a 2,0 mm test sieve. It may be used to determine the particle
size distribution of agglomerates of very fine particles. This method may be used
with test sieves in a range of aperture sizes, e.g. 63 µm and 90 µm.
The air permeability method (Blaine) measures the specific surface (mass related surface)
by comparison with a reference cement sample. The determination of the specific surface
serves primarily to check the consistency of the grinding process of one and the same
plant. This method only enables a limited assessment to be made of the properties
of the cement in use.
NOTE The air permeability method may not give significant results for cements containing
ultrafine materials.
The methods are applicable to all the cements defined in EN 197.