How do you determine the fineness of cement by air permeability method?

By Guidelines

How do you determine the fineness of cement by air permeability method?

FINENESS OF CEMENT BY BLAINES AIR PERMEABILITY METHOD (IS-4031-PART-2)

  1. Measuring instruments.
  2. V = (M1-M2)/D,
  3. i.e. W = (1-e)ρV.
  4. or W = 0.500ρV.
  5. IS:4031(Part-2):1996-Method of physical tests for hydraulic cement(Determination of fineness by Blaine air permeability method)

What is Blaine air permeability method?

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 are the method of determining fineness of cement?

Fineness of cement is tested in two ways : (a) By sieving. (b) By determination of specific surface (total surface area of all the particles in one gram of cement) by air-permeability apparatus. Expressed as cm2/gm or m2/kg. Generally Blaine Air permeability apparatus is used.

How is Blaine cement measured?

The Blaine Fineness Apparatus is used in measuring the fineness of Portland cement in accordance with ASTM and AASHTO standards. The fineness is measured in terms of the specific area of cement expressed as total surface area in square centimeters per gram.

What is cement Blaine?

The particle size or fineness of a cement in cm2/g or m2/kg, usually determined from air permeability tests using a device known as a Blaine permeameter. Fineness affects the hydration rate (setting) and the requirements for the amounts of water, retarder, and dispersant.

What is the Blaine of cement?

1. n. [Drilling Fluids] The particle size or fineness of a cement in cm2/g or m2/kg, usually determined from air permeability tests using a device known as a Blaine permeameter. Fineness affects the hydration rate (setting) and the requirements for the amounts of water, retarder, and dispersant.

How do you test air permeability?

Testing for air permeability Air permeability is determined by measuring the rate of airflow through a known area of material. This is achieved by applying a known pressure differential across a set area of material. Both these factors can be selected for the particular type of material being tested.

What is the influence of cement fineness on the structure?

The workability of concrete increases with an increase in cement fineness. The compressive and split tensile strengths of concrete increases as cement particles increase in fineness from Zone A to C. Also, the finer the cement, the high the reactiveness of its particle.

Why steel is used in RCC?

Concrete is only strong against forces of compression and has low tensile strength and ductility. Reinforcement materials are needed to withstand shear and tensile forces on the concrete. Steel is used because it bonds well with concrete and expands and contracts due to temperature at similar rates.