Is 456 Latest Amendment Pdf ((free)) [ Verified Source ]
As of April 2026, Amendment No. 6, issued in June 2024 (some sources note its release as April 2024), is the latest finalized amendment for the IS 456:2000 "Plain and Reinforced Concrete — Code of Practice". While IS 456:2000 remains the active standard, the Bureau of Indian Standards (BIS) is currently working on a major fifth revision (IS 456:202X) that will transition it to a "Structural Concrete" code. Key Updates in Amendment No. 6 (2024)
IS 456:2000 (Plain and Reinforced Concrete - Code of Practice) is 456 latest amendment pdf
- Reduction of the maximum permissible value of free water/cement ratio from 0.55 to 0.50 for reinforced concrete exposed to severe environments (Clause 5.2.2.1)
- Revision of Clause 8.2 on 'Cover to Reinforcement' to include a new provision that the nominal cover to reinforcement shall not be less than 20 mm for mild exposure and 30 mm for moderate, severe, and very severe exposures
- Revision of Clause 10.3.2 on 'Compressive Strength of Concrete' to permit the use of M30 and above concrete grades with a maximum cement content of 450 kg/m³
Overview of IS 456 Amendments
| Amendment Number | Year | Key Focus Area | |----------------|------|----------------| | Amendment 1 | 2001 | Editorial and minor corrections | | Amendment 2 | 2004 | Durability, cover requirements | | Amendment 3 | 2007 | Reinforcement detailing and fire resistance | | Amendment 4 | 2013 (Reaffirmed 2021) | Limit state design revisions, material specifications, durability enhancements | As of April 2026, Amendment No
Concrete Durability: Modifies requirements for cement content, water-cement ratios, and aggregate sizes, especially in relation to limestone-based cements. Reduction of the maximum permissible value of free
Crack Width (Clause 35.3.2): For moderate exposure, the maximum permissible surface crack width is 0.2 mm.
Consolidated previous changes for easier access in reprints. Amendment 4 (2013)
Amendment 6 introduces several critical updates to the 2000 code: