Physical Requirement for Fly Ash based PPC (Portland Pozzolana Cement)-(IS-1489-Part 1)
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.
- The fineness value of fly ash based PPC when tested by Blaine’s air permeability method shall not be less than 300 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 shall not be less than 30 minutes.
- Final setting time shall not be more than 600 minutes.
- The average drying shrinkage of mortar bars prepared and tested in accordance with IS 4031 Part 10, shall not be more than 0.15%.
- 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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