IS 1489:1991 Part 2 is the Indian Standard (BIS) for portland-pozzolana cement - part 2: calcined clay based - specification. 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.
Overview
- Status
- Current
- Usage level
- Frequently Used
- Domain
- Materials Science — Concrete
- Type
- Specification
- Amendments
- Amendment 1 (1993); Amendment 2 (1999); Amendment 3 (2000); Amendment 4 (2008)
Also on InfraLens for IS 1489
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.
Frequently referenced clauses
Updates & Amendments4 amendments
1993Amendment 1 (1993)
1999Amendment 2 (1999)
2000Amendment 3 (2000)
2008Amendment 4 (2008)
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
cementcalcined claypozzolanaPPCconcrete
International Equivalents
🌐
International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values9
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%
Tables & Referenced Sections
Key Tables
Table 1 - Chemical Requirements
Table 2 - Physical Requirements
Key Clauses
Clause 4 - Raw Materials
Clause 5 - Manufacture
Clause 6 - Chemical Requirements
Clause 7 - Physical Requirements
Clause 9 - Packing
Clause 10 - Marking
Frequently Asked Questions4
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.
QA/QC Inspection Templates
📋
QA/QC templates coming soon for this code.