Amendment Pdf — Is 456 Latest

IS 456 (2000), the Code of Practice for Plain and Reinforced Concrete, remains the active base code for RCC design in India. There is no "IS 456:2026" or similar newly named edition. Instead, the Bureau of Indian Standards (BIS) updates the document by issuing periodic amendments. 🏗️ Current Status of IS 456

To use the code correctly, engineers must combine the core document with all issued amendments.

The Core Document: IS 456:2000 (Fourth Revision), reaffirmed in 2021. The Latest Amendment: Amendment No. 6, issued in 2024.

If you are looking for a complete, up-to-date PDF, you need a version that has all six amendments compiled into the text, or you must download the individual amendment sheets from the BIS portal. Breakdown of All Amendments to IS 456:2000

The BIS has issued six distinct amendments since the release of the 2000 version. Amendment 1 (2001) & Amendment 2 (2005)

Focused on initial minor corrections to typos and cross-references.

Introduced guidelines for using silica fume conforming to IS 15388.

Allowed silica fume as a partial cement replacement (typically 5% to 10%). Amendment 3 (2007)

Provided minor updates to testing standards and material references.

Consolidated previous changes for easier access in reprints. Amendment 4 (2013)

IS 456: 2000 Amendment No. 6 (2024) | PDF | Concrete - Scribd is 456 latest amendment pdf

I understand you're looking for detailed information about the latest amendment to IS 456 (the Indian Standard code for plain and reinforced concrete), specifically regarding its PDF version. However, I must clarify a few important points before providing the detailed content:

1. IS 456:2000 is the current version of the code. Its latest amendment is Amendment No. 4 (Reaffirmed 2021) or subsequent revisions issued by the Bureau of Indian Standards (BIS).
2. I cannot directly provide or link to a PDF of the copyrighted standard, but I can guide you on where and how to obtain it legally, and summarize the key changes introduced in the latest amendments.

Below is a comprehensive, long-form content piece you can use for reference, study, or publication.

Method 4: Third-party Standards Stores

• Websites like LawResourceIndia, Archive.org (only for preview, not for commercial use), or Civil Engineering Portal – but verify authenticity. No illegal copy matches the BIS original.

Never download from random Google Drive links – they often contain pre-2000 versions or corrupted files without the essential Amendment No. 4 insert pages.

Before Amendment (Pre-2013)

• Design up to M60 grade concrete.
• Cover often insufficient for coastal or industrial zones.
• No mandatory fire rating tables.

Key Changes Introduced:

A. Withdrawal of Fe 415 Grade Steel The most impactful change is the move to phase out Fe 415 grade steel from general structural applications in favor of higher strength steel (Fe 500 and above) and ductile steel (HYSD).

• Old Text: Permitted Fe 250 (mild steel), Fe 415, Fe 500, and Fe 550.
• New Text: References to plain mild steel bars (Fe 250) and medium tensile steel have been updated to align with modern manufacturing.
• Implication: Designs using Fe 415 are increasingly becoming non-standard for new construction, pushing the industry toward Fe 500, Fe 500D, Fe 550, and Fe 600.

B. Introduction of Higher Grades The amendment formally incorporates provisions for higher grades of reinforcement, specifically referencing the updated IS 1786 (High Strength Deformed Steel Bars).

• It clarifies design stresses for Fe 500D (Ductile) and Fe 550D, which are preferred in seismic zones.

C. Clarification on Design Constants The values for design shear strength of concrete ($\tau_c$) and other constants were reviewed to ensure safety margins remained adequate with the new steel stress limits.

D. Durability Updates References to exposure conditions were tweaked to align strictly with IS 456 Table 3 and the National Building Code (NBC) 2016, ensuring that concrete mix designs

As of April 2026, the latest formal update to the concrete code is Amendment No. 6, issued in June 2024 to the IS 456:2000 (Fourth Revision).

While IS 456:2000 remains the active base code, the Bureau of Indian Standards (BIS) has also circulated a preliminary draft for the 5th Revision, titled IS 456:2025 ("Structural Concrete: Code of Practice"), which is expected to eventually replace the current standard. Key Highlights of Amendment No. 6 (June 2024)

This amendment introduces significant technical updates, particularly regarding sustainable materials and concrete mix requirements: IS 456 (2000), the Code of Practice for

New Cement Types: Incorporates specifications for Composite Cement and Portland Calcined Clay Limestone Cement (as per IS 18189) for use in reinforced concrete.

Mineral Admixtures: Updates guidelines for using materials like fly ash, ground granulated blast furnace slag (GGBS), and ultrafine materials (silica fume, metakaolin). Concrete Durability:

Adds restrictions on using certain cements in underground structures or contact with groundwater in cold climates (predominantly below 15°C).

Revises Table 5 to reduce the maximum free water-cement ratio by 0.05 when using Portland Calcined Clay Limestone Cement.

Testing and Strength: Refines procedures for concrete strength testing and updates bond stress values for reinforcing bars. Future Outlook: IS 456:2025 (Draft)

The upcoming 5th revision represents a major overhaul of the standard:

Scope Expansion: It is expected to merge provisions for both reinforced and prestressed concrete, potentially withdrawing IS 1343:2012.

Design Criteria: Introduces six primary criteria: strength, serviceability, durability, robustness, integrity, and restorability.

New Title: The code's name will change to Structural Concrete: Code of Practice. Verification and Official Links

For professional use, always refer to the latest versions directly from official or verified repositories: IS 456:2000 is the current version of the code

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

Consolidated Codes: Platforms like Law Resource India often host the base IS 456:2000 code, though they may not always include the very latest 2024 amendment immediately.

IS 456: 2000 Amendment No. 6 (2024) | PDF | Concrete - Scribd

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.

While IS 456:2000 remains the legally binding code of practice, structural engineers and construction professionals must stay informed about the latest updates, specifically Amendment No. 6 (June 2024) and the upcoming IS 456:2025 Draft. Current Status: IS 456 Amendments at a Glance

As of 2026, the Bureau of Indian Standards (BIS) has issued six formal amendments to the 2000 edition.

IS 456 Amendment No. 6 - June 2024 | PDF | Concrete - Scribd

The Indian Standard IS 456 Amendment No. 6, released in 2024, updates the code of practice for plain and reinforced concrete by incorporating new sustainable cement types like LC3 and revising mineral admixture limits, such as limiting fly ash to 35%. The amendment also introduces high-strength concrete grades up to M100 and reinforces restrictions on using sea water to enhance structural durability. For a detailed breakdown of the amendment, see this Scribd document. 

IS 456: 2000 Amendment No. 4 Summary | PDF | Concrete - Scribd

Comparison: IS 456:2000 vs. International Codes (After Amendment No. 4)

After the latest amendment, IS 456 aligns more closely with:

| Feature | IS 456 (with Amd. 4) | ACI 318-19 (USA) | Eurocode 2 | |---------|----------------------|------------------|------------| | Min. cover (mild exposure) | 25 mm | 40 mm (for non-prestressed) | 25 mm | | Max cement content | 450 kg/m³ | No limit (but durability checks) | 400 kg/m³ | | Partial safety factor for concrete | 1.5 | 1.4 | 1.5 | | Minimum Fe grade reinforcement | Fe 415 | Grade 60 (≈420 MPa) | B500C (500 MPa) |

The latest amendment bridges the gap between older Indian practices and modern international standards.

B. Concrete Grades (Clause 5.1 & 6.1)

• Minimum Grade: The minimum grade of concrete for Prestressed Concrete has been strictly updated.
• M20 Requirement: For Reinforced Concrete (RC), M20 remains the minimum, but for durability in severe environments, higher grades are now mandated more strictly.
• Maximum Grade: Clarity provided on the testing and use of grades higher than M60 (High Strength Concrete), requiring specific pilot testing.