IS 1489:1991 Part 1 is the Indian Standard (BIS) for portland-pozzolana cement - part 1: flyash based - specification. This standard specifies the physical and chemical requirements, manufacturing process, and testing for flyash-based Portland-Pozzolana Cement (PPC). It sets the acceptable range for flyash inclusion, setting times, soundness, and required compressive strength milestones to ensure long-term durability in concrete structures.
Specifies requirements for fly ash based Portland-Pozzolana Cement.
Overview
- Status
- Current
- Usage level
- Essential
- Domain
- Materials Science — Concrete
- Type
- Specification
- Amendments
- Amendment 1; Amendment 2; Amendment 3; Amendment 4
Also on InfraLens for IS 1489
Practical Notes
! PPC develops early strength slower than Ordinary Portland Cement (OPC), so formwork removal might need to be delayed compared to OPC.
! PPC has a lower heat of hydration, making it ideal for mass concrete works and minimizing thermal cracking.
! Concrete made with PPC requires extended curing periods to fully leverage the secondary pozzolanic reactions for maximum durability and strength.
Frequently referenced clauses
Updates & Amendments4 amendments
Amendment 1
Amendment 2
Amendment 3
Amendment 4
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
cementportland pozzolana cementflyashconcrete
International Equivalents
🌐
International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values8
Quick Reference Values
fly ash content min15%
fly ash content max35%
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
Tables & Referenced Sections
Key Tables
Table 1 - Chemical Requirements
Table 2 - Physical Requirements
Key Clauses
Clause 4 - Raw Materials
Clause 6 - Physical Requirements
Clause 7 - Chemical Requirements
Clause 9 - Packing and Marking
Frequently Asked Questions3
What is the permissible percentage of fly ash in PPC?+
According to the standard, the fly ash content must be between 15% and 35% by mass of the Portland-Pozzolana Cement.
What is the minimum initial setting time for fly ash based PPC?+
The minimum initial setting time is 30 minutes, which is identical to standard OPC.
What is the minimum required compressive strength at 28 days?+
The minimum 28-day compressive strength requirement is 33 MPa.
QA/QC Inspection Templates
📋
QA/QC templates coming soon for this code.