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7 and 28 day strength of 53 grade OPC

Short answer

For 53 grade OPC (IS 12269), the minimum compressive strength of mortar cubes is 37 MPa at 7 days and 53 MPa at 28 days.

What is the 7 and 28 days crushing strength of 53 grade OPC cement?

For 53 grade OPC (IS 12269) the minimum compressive strength of 70.6 mm mortar cubes is:

  • 7 days: 37 MPa (N/mm²)
  • 28 days: 53 MPa (N/mm²)

(The 3-day minimum is 27 MPa.)

✓ Answer checked by Claude Opus 5.5 (high effort)

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