What is the permissible range of fly ash in PPC?

It must be between 15% to 35% by mass of the cement.

What is the minimum 28-day compressive strength of PPC?

The minimum required 28-day compressive strength is 33 MPa (equivalent to OPC 33 grade).

Can PPC be used for RCC works?

Yes, it is highly suitable for RCC works, provided curing time is appropriately maintained and formwork removal is adjusted for slower initial strength gain.

IS 1489 Part 1

: 2013

Portland Pozzolana Cement - Specification - Part 1: Fly Ash Based

CurrentEssentialSpecificationMaterials Science · Flooring and Paving

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This standard specifies the manufacturing, chemical, and physical requirements for fly ash-based Portland Pozzolana Cement (PPC). It sets quality limits for ingredients, strength development, setting times, and durability to ensure reliable performance in construction.

Specifies requirements for fly ash based portland pozzolana cement for general construction purposes.

Quick Reference Values

Fly ash content range15% to 35% by mass

Minimum initial setting time30 minutes

Maximum final setting time600 minutes

Minimum fineness (Blaine specific surface)300 m²/kg

Minimum compressive strength at 3 days16 MPa

Minimum compressive strength at 7 days22 MPa

Minimum compressive strength at 28 days33 MPa

Maximum magnesia (MgO) content6.0%

Practical Notes

PPC gains strength slower than OPC in the initial days but achieves similar or higher ultimate strength at 90 days due to secondary pozzolanic reactions.

Extended and continuous curing is highly critical for PPC compared to OPC to prevent surface cracking and ensure full pozzolanic action.

Highly recommended for mass concreting and marine environments due to its lower heat of hydration and superior resistance to sulphate attack.