Physical Requirement for Fly Ash based PPC (Portland Pozzolana Cement)-(IS-1489-Part 1)

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When a fly ash based Portland Pozzolana cement is tested for its physical requirements, then it must satisfy the following specifications given by IS 1489-Part 1.

  1. The fineness value of fly ash based PPC when tested by Blaine’s air permeability method shall not be less than 300 m2/kg.
  2. The expansion value (i.e. soundness) of unaerated cement when tested by Le-Chaelier method shall not be more than 10 mm and when tested by autoclave method shall not be more than 0.8%.
  3. Initial setting time shall not be less than 30 minutes.
  4. Final setting time shall not be more than 600 minutes.
  5. The average drying shrinkage of mortar bars prepared and tested in accordance with IS 4031 Part 10, shall not be more than 0.15%.
  6. The average compressive strength of at least 3 mortar cubes, when tested as per IS-4031-Part 6, shall be as follows.
Sl.No Time Compressive strength (MPa)
1 72 ± 1 hour Not less than 16 Mpa
2 168 ± 2 hour Not less than 22 Mpa
3 672 ± 4 hour Not less than 33 Mpa

 

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