About this code
Specification for high-strength 53-grade OPC. Used for M45+ concrete, prestressed work, fast-track construction, and high-rise structures.
Key sections
- 01Scope
- 02Chemical requirements
- 03Physical requirements
- 04Sampling and testing
Critical clauses
Clause 6.1Compressive Strength
Min 27/37/53 MPa at 3/7/28 days.
In practiceFor M45 and above; allows lower cement content.
Clause 6.3Heat of Hydration
Higher than OPC 43 — manage in mass pours.
In practiceUse ice or chilled water for sections > 1m thick.
Practical implications
For specifiers
For M45+, prestressed, fast-track.
For suppliers
Manage stock — shorter shelf life.
For executors
Aggressive curing required.
FAQs
Can OPC 53 cause shrinkage?
Yes — high heat and fineness increase early shrinkage. Cure aggressively.
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