What is the acceptable range of calcined clay in this cement?

Between 10% and 25% by mass of the cement.

What are the requirements for setting time?

Initial setting time must be at least 30 minutes, and final setting time must not exceed 600 minutes.

What is the required 28-day compressive strength of calcined clay PPC?

The minimum compressive strength at 28 days is 33 MPa (Table 2).

What is the maximum limit for drying shrinkage?

Drying shrinkage should not exceed 0.15 percent.

IS 1489 Part 2

: 1991

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

CurrentFrequently UsedSpecificationMaterials Science · Concrete

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Specifies the chemical, physical, and manufacturing requirements for Portland-Pozzolana Cement (PPC) manufactured using calcined clay. It details the acceptable limits for setting time, compressive strength, fineness, and chemical composition to ensure suitability for general construction, marine works, and mass concreting.

Specifies requirements for calcined clay based Portland-Pozzolana Cement.

Quick Reference Values

Pozzolana (calcined clay) content limit10% to 25% by mass

Minimum fineness (Blaine's air permeability)300 m²/kg

Minimum initial setting time30 minutes

Maximum final setting time600 minutes

Minimum 3-day compressive strength16 MPa

Minimum 7-day compressive strength22 MPa

Minimum 28-day compressive strength33 MPa

Maximum Magnesia (MgO) content6.0%

Maximum Sulphuric anhydride (SO3)3.0%

Practical Notes

Ensure accurate differentiation between Part 1 (Fly Ash based) and Part 2 (Calcined Clay based) when procuring PPC.

PPC has a lower heat of hydration and better sulphate resistance compared to Ordinary Portland Cement (OPC), making it highly recommended for mass concrete structures like dams and marine environments.

Because PPC gains strength more slowly initially than OPC, formwork stripping times may need to be extended and strict curing regimes must be followed.