The fineness of cement has a significant effect in its physical properties when used in concrete. Generally the finer the cement powder, the more rapid the concrete will set, as there is an increase in its surface area. The measure of fineness is usually undertaken by sieving, and the result assessed against the cement standard for compliance.
The Blaine air permeability apparatus is used to determine the fineness of Portland cement in terms of the specific surface expressed as total surface area in square centimeters per gram of cement. The Blaine apparatus draws a defined volume of air through a prepared bed of cement of defined porosity.
General Description & Specification:
The apparatus comprises one each of Brass or stainless steel permeability cell 12.5mm,'U' tube manometer with stop cock mounted on a laminated wooden stand, perforated metal disc, plunger, Rubber stopper, Rubber tube – 30cm long with rubber bulb.
At extra cost
- Balance with 0.001 gm resolution
- Stop Watch with 0.5 second resolution
- Manometer Liquid
- Whatman Filter Paper
- Filter Punch