BLAINE AIR PERMEABILITY APPARATUS
BLAINE AIR PERMEABILITY APPARATUS
Model No : AEC – 402
Standards As per IS : 7535 1986
The Blaine Air Permeability Apparatus is used to determine the fineness of cement in terms of specific surface area (m²/kg). This value indicates how finely the cement particles are ground, which directly affects the rate of hydration and, consequently, the strength and setting characteristics of the
cement.
The apparatus works on the air permeability method. It measures the time taken for a fixed volume of air to pass through a compacted bed of cement
under a known pressure difference.
- The sample of asphalt mix is placed in the extractor bowl.
- Solvent is added to dissolve the bitumen. The hand crank rotates the bowl at high speed, forcing the bitumensolvent solution outward.
- The aggregates remain in the bowl, and the bitumen solution is collected in a graduated container.
- Repeated washing ensures complete bitumen extraction.
- The extract is evaporated to determine bitumen content.
- Accurate measurement of cement fineness (specific surface)
- Precise and repeatable results
- Suitable for ordinary Portland cement, blended cements, and other
powders - Simple construction, easy to maintain
- Temperature-sensitive fluid used to ensure consistent pressure drop
- Essential for quality control in cement production.