When a Portland Slag cement is tested for its physical requirements, then it must satisfy the following specifications given by IS 12269.
- The fineness value of PSC 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 53 grade OPC shall not be less than 30 minutes.
- Final setting time of 53 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 16 Mpa |
| 2 | 168 ± 2 hour | Not less than 22 Mpa |
| 3 | 672 ± 4 hour | Not less than 33 Mpa |
Hi.
Iam Vishwas from Lucknow. I am about to start a fly ash brick plant here. I want to know that is PSC suitable for making bricks? I wud use 45%-50 fly ash ,40%stonedust rest cement. I want high strength bricks. If not PSC then OPC is suitable ??