What is the permissible fly ash content in PPC according to IS 1489 Part 1?

The fly ash constituent shall not be less than 15 percent and not more than 35 percent by mass.

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

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

What are the setting time limits for PPC?

The initial setting time shall be minimum 30 minutes, and the final setting time shall be maximum 600 minutes.

Is PPC suitable for reinforced concrete works?

Yes, PPC is widely used for RCC works, provided extended curing is done to accommodate its slower rate of initial strength gain.

IS 1489 Part 1

: 2015

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

CurrentEssentialSpecificationMaterials Science · Cement

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This standard lays down the manufacturing, chemical, and physical requirements for fly ash-based Portland-Pozzolana Cement (PPC). It ensures that PPC achieves appropriate strength, fineness, and durability characteristics, promoting the use of fly ash as a supplementary cementitious material for sustainable construction.

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

Quick Reference Values

fly ash content range15% to 35% by mass

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

fineness blaine min300 m²/kg

soundness le chatelier max10 mm

Practical Notes

PPC develops strength slower than Ordinary Portland Cement (OPC) in the first few days, requiring longer curing periods.

PPC is highly recommended for mass concrete and marine structures due to its lower heat of hydration and improved resistance to sulphate attack.

The color of the cement can vary depending on the fly ash used, but color is not an indicator of cement quality.