What is the minimum 28-day compressive strength for calcined clay PPC?

33 MPa, as per Table 2 (Physical Requirements).

What are the setting time limits for this cement?

The initial setting time must be at least 30 minutes, and the final setting time must not exceed 600 minutes.

What is the minimum fineness requirement?

300 m²/kg when tested using the Blaine air permeability method.

Can calcined clay PPC be used for RCC structures?

Yes, it is permitted for reinforced cement concrete works (per IS 456), but stripping time of formwork should be adjusted for its slower initial strength development.

IS 1489 Part 2

: 2013

Portland Pozzolana Cement - Specification - Part 2: Calcined Clay Based

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This standard specifies the manufacturing, chemical, and physical requirements for Portland Pozzolana Cement (PPC) formulated with calcined clay. It details the acceptable limits for various properties like compressive strength, setting times, and fineness to ensure suitability for structural applications and mass concrete works.

Specifies requirements for calcined clay based portland pozzolana cement for general construction purposes.

Quick Reference Values

Minimum Fineness (Blaine's method)300 m²/kg

Initial Setting Time (Minimum)30 minutes

Final Setting Time (Maximum)600 minutes

Compressive Strength at 3 days (Minimum)16 MPa

Compressive Strength at 7 days (Minimum)22 MPa

Compressive Strength at 28 days (Minimum)33 MPa

Maximum Magnesia (MgO) content6.0 percent

Maximum Sulphuric Anhydride (SO3)3.0 percent

Practical Notes

PPC (Calcined Clay) is ideal for mass concrete and marine structures due to its low heat of hydration and high resistance to sulfate attack.

Curing time must generally be extended compared to Ordinary Portland Cement (OPC) because PPC gains strength more slowly in the initial days.

Ensure proper packaging (usually 50 kg bags) and store in a dry place, as pozzolanic cements are highly sensitive to moisture degradation over time.