What is the permissible percentage of calcined clay in this cement?

It shall be between 15 percent and 33 percent by mass of the Portland-Pozzolana cement.

Does calcined clay PPC have a different setting time compared to OPC?

No, the standard setting time limits remain the same as OPC: minimum 30 minutes for initial setting and maximum 600 minutes for final setting.

What is the 28-day target strength for PPC as per this standard?

The minimum compressive strength at 28 days is 33 MPa.

IS 1489 Part 2

: 2015

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

CurrentFrequently UsedSpecificationMaterials Science · Cement

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This standard specifies the requirements for the manufacture, chemical and physical properties, and testing of Portland-Pozzolana Cement (PPC) incorporating calcined clay. It is extensively used in mass concrete, marine, and hydraulic structures due to its low heat of hydration and improved resistance to chemical attacks.

Specifies requirements for portland-pozzolana cement (PPC) manufactured using calcined clay as pozzolanic material.

Quick Reference Values

calcined clay content15% to 33% by mass

fineness blaine min300 m2/kg

initial setting time min30 minutes

final setting time max600 minutes

compressive strength 3 days min16 MPa

compressive strength 7 days min22 MPa

compressive strength 28 days min33 MPa

soundness le chatelier max10 mm

Practical Notes

PPC has a slower rate of initial strength development compared to OPC; therefore, formwork stripping times may need to be extended.

Extended wet curing is highly recommended for PPC to ensure complete pozzolanic reaction and achieve optimal durability.

Part 1 of IS 1489 covers fly ash based PPC, whereas this Part 2 is specifically for calcined clay based PPC.