When a 43 grade ordinary Portland cement is tested for its physical requirements, then it must satisfy the following specifications given by IS 8112.
- The fineness value of 43 grade OPC when tested by Blaine’s air permeability method shall not be less than 225 m2/kg.
- 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%.
- Initial setting time of 43 grade OPC shall not be less than 30 minutes.
- Final setting time of 43 grade OPC shall not be more than 600 minutes.
- 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 23 Mpa |
| 2 | 168 ± 2 hour | Not less than 33 Mpa |
| 3 | 672 ± 4 hour | Not less than 43 Mpa |
sir, what is the consistency of 43 and 53 grade cement?
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