What does '43 Grade' mean?

It means the cement must have a minimum compressive strength of 43 MPa (megapascals) at 28 days (Table 2).

What is the minimum initial setting time?

The initial setting time must be at least 30 minutes, allowing time for mixing and placing concrete (Table 2).

What is the maximum permissible soundness?

The maximum expansion measured by the Le Chatelier method should not exceed 10 mm, which ensures the hardened concrete will not undergo significant volume change (Table 2).

Is this cement suitable for all general construction?

Yes, 43 Grade OPC is a widely used general-purpose cement suitable for most concrete works, including RCC, plastering, and masonry.

IS 8112

: 2013

Ordinary Portland Cement, 43 Grade - Specification

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This standard lays down the specifications for 43 Grade Ordinary Portland Cement (OPC), covering its chemical composition and physical properties. It details mandatory requirements for strength, setting time, soundness, and fineness to ensure the cement's quality and performance in concrete construction.

Specifies requirements for 43 Grade Ordinary Portland Cement.

Quick Reference Values

Minimum 28-day compressive strength43 MPa

Minimum 7-day compressive strength33 MPa

Minimum 3-day compressive strength23 MPa

Minimum initial setting time30 minutes

Maximum final setting time600 minutes

Maximum soundness (Le Chatelier)10 mm

Minimum fineness (Blaine's)225 m²/kg

Practical Notes

The '43' in the grade designation refers to the minimum 28-day compressive strength of 43 MPa when tested under standard conditions.

Always check the manufacturing date on the bag; cement strength deteriorates over time, with a significant drop after 3 months of storage.

Proper on-site storage in a dry, raised environment is critical to prevent lump formation and maintain the cement's properties as per Clause 10.