When a RHPC (Rapid Hardening Portland cement) is tested for its physical requirements, then it must satisfy the following specifications given by IS 8041.
- The fineness value of RHPC when tested by Blaine’s air permeability method shall not be less than 325 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 RHPC shall not be less than 30 minutes.
- Final setting time of RHPC 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 | 24hour ± 30 min | Not less than 16 Mpa |
2 | 72 ± 1 hour | Not less than 27 Mpa |