Physical Requirement for 33 Grade OPC (Ordinary Portland Cement)-(IS-269)

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When a 33 grade Ordinary Portland cement is tested for its physical requirements, then it must satisfy the following specifications given by IS 269.

  1. The fineness value of 33 grade OPC when tested by Blaine’s air permeability method shall not be less than 225 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 of 33 grade OPC shall not be less than 30 minutes.
  4. Final setting time of 33 grade OPC shall not be more than 600 minutes.
  5. 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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