About this code
Consolidated specification for OPC 33, 43, and 53 grades. Replaces IS 8112 and IS 12269 in updated format. Defines chemical composition, physical requirements, and testing.
Key sections
- 01Scope
- 02Chemical requirements
- 03Physical requirements (fineness, setting, soundness, strength)
- 04Sampling and testing
- 05Marking
Critical clauses
3, 7, 28-day strength minima per grade.
In practiceOPC 53: 27/37/53 MPa min at 3/7/28 days.
Initial >= 30 min, Final <= 600 min.
In practiceHot weather: prefer slower-setting batches.
Le Chatelier <= 10mm; autoclave <= 0.8%.
In practiceReject cement failing soundness — causes cracking.
Min 225 m2/kg by Blaine.
In practiceHigher fineness = faster strength, higher heat.
Practical implications
Specify grade explicitly (43 or 53).
Maintain mill test certificates.
Verify bag marking; reject if older than 3 months.
FAQs
It consolidates them; IS 8112 and IS 12269 remain valid for OPC 43/53 specifically.
Purchase the official Bureau of Indian Standards publication for the complete, legally-binding text.
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