Is 456 Latest Amendment Pdf -

The current latest version of the Indian Standard for plain and reinforced concrete is IS 456:2000 (Reaffirmed 2021), which includes a total of six amendments.

Key Changes Introduced in the Latest Amendment (No. 4)

1. Durability Requirements for Concrete

• Exposure conditions reclassified with stricter limits for chlorides and sulfates.
• Minimum cement content increased for moderate, severe, and extreme exposures.
• Maximum water-cement ratio reduced to 0.45 for severe exposure (previously 0.50).

Bureau of Indian Standards (BIS): You can search for and download official amendments and draft versions on the BIS e-Sale Portal. is 456 latest amendment pdf

However, the draft is not yet final. Until BIS publishes the final version, Amendment No. 4 is the latest legally binding amendment. The current latest version of the Indian Standard

For Quality Control:

• Use the updated standard deviation multipliers for concrete mix design.
• For severe exposure (near sea), cover must be 45mm min. – update your checklist.