In which of test cement air permeability method is used? Blaine Air Permeability Apparatus is used for determining the fineness of Portland Cement measures the specific surface area of fine materials in square centimeters per
In which of test cement air permeability method is used?
Blaine Air Permeability Apparatus is used for determining the fineness of Portland Cement measures the specific surface area of fine materials in square centimeters per gram of test sample. By using this apparatus, a quantity of air is drawn through a bed of definite porosity.
What is air permeability method?
Air permeability is defined as the rate of airflow passing perpendicularly through a known area under a prescribed air pressure differential between the two surfaces of a material. From: Soft Computing in Textile Engineering, 2011.
What is Blaine method?
Blaine’s method is based on the fact that the air permeability of a packed bed of particles is proportional to their fineness and therefore the SSA. The value measured during testing is the time required to pass a certain volume of air through a packed bed of solids with given size and porosity.
What is the use of air permeability method?
Air permeability is an important factor in the performance of such textile materials as gas filter, fabrics for air bags, clothing, mosquito netting, parachutes, sails, tentage, and vaccum cleaners. It can also be used to provide an indication of the breathability of weather-resistant and rainproof fabrics.
How is Blaine of cement calculated?
PROCEDURE:
- Put a filter paper into the cell then weight 2.84g of cement sample into it.
- Put another filter paper on it and compress with the plunger.
- Attach the cell on top of the U-tube manometer.
- Evacuate the air in the manometer through the side tube using the aspirator bulb until the oil reaches level 1.
Why do we measure air permeability?
Air permeability measures how easily air is passed through fabric. It indicates the breathability of weather-resistant and waterproof fabrics and is an important factor in the performance of materials like industrial curtains, sails, airbags and parachutes.
Which equation is air permeability method?
The air permeability can be calculated using the Kozeny-Carman equation (Equations 3. a.i or 3. c.i) if the specific area is known. In the case of a sphere of diameter D, the specific area, SV=6D.
What is Blaine No?
The softness of mineral is usually expressed by the specific surface defined as the total surface area of particles in cm2 per gram or m2 per kg cement, which is known as “Blaine number” [6-8]. This method can be used to measure the softness degree of various materials, including iron [6].
What is the unit of fineness of cement?
The fineness of cement is represented as cm2 / gram i.e Area/mass. The fineness of cement is measured by sieving it on the standard sieve. The proportion of cement of which the grain sizes are larger than the specified mesh size is thus determined.
How is fineness of cement calculated?
Fineness = (W2/W1) * 100 Then, calculate the percentage of Weight of cement-retained on Sieve. Repeat this procedure with three different samples of cement and average the values for accurate results.