What is the minimum required compressive strength at 28 days for 53 Grade cement?

The minimum strength is 53 MPa (megapascals), as per Table 2.

What is the permissible initial and final setting time?

The minimum initial setting time is 30 minutes, and the maximum final setting time is 600 minutes (10 hours) as per Table 2.

What does '53' in '53 Grade' signify?

It signifies the minimum characteristic compressive strength of the cement mortar cubes (in MPa) after 28 days of curing.

Is this cement suitable for all general construction?

No, it is primarily for high-strength concrete. For general purposes like plastering or low-strength concrete, using PPC (IS 1489) or OPC 43 (IS 8112) is often more appropriate and economical.

IS 12269

: 2015

Ordinary Portland Cement, 53 Grade - Specification

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This standard specifies the manufacturing, chemical, and physical requirements for 53 Grade Ordinary Portland Cement (OPC). It is used in applications requiring high early and final strength, such as pre-stressed concrete, high-rise buildings, and infrastructure projects. The standard also covers provisions for packing, marking, and testing to ensure quality.

Specifies requirements for 53 Grade Ordinary Portland Cement.

Quick Reference Values

Minimum 3-day compressive strength27 MPa

Minimum 7-day compressive strength37 MPa

Minimum 28-day compressive strength53 MPa

Minimum initial setting time30 minutes

Maximum final setting time600 minutes

Maximum loss on ignition4.0 %

Maximum expansion (Le Chatelier)10 mm

Minimum fineness (Blaine's)225 m²/kg

Practical Notes

53 Grade OPC has a higher heat of hydration compared to 43 or 33 Grade, which requires careful management in mass concrete pours to avoid thermal cracking.

Due to its high early strength, formwork can often be removed sooner, but it's generally not recommended for plastering or masonry work as it may cause shrinkage cracks.

Always check the manufacturing date on the bag; cement older than three months should be retested for strength before use as per IS guidelines.