{"id":68,"date":"2026-02-10T11:12:04","date_gmt":"2026-02-10T11:12:04","guid":{"rendered":"https:\/\/blog.ersujanchapagain.com.np\/?p=68"},"modified":"2026-02-10T11:16:16","modified_gmt":"2026-02-10T11:16:16","slug":"major-changes-proposed-in-new-proposed-is-456-2025-concrete-code","status":"publish","type":"post","link":"https:\/\/blog.ersujanchapagain.com.np\/index.php\/2026\/02\/10\/major-changes-proposed-in-new-proposed-is-456-2025-concrete-code\/","title":{"rendered":"Major Changes in New Proposed IS 456:2025 Concrete Code"},"content":{"rendered":"<div class=\"yoast-breadcrumbs\"><span><span><a href=\"https:\/\/blog.ersujanchapagain.com.np\/\">Home<\/a><\/span> \u00bb <span class=\"breadcrumb_last\" aria-current=\"page\">Major Changes in New Proposed IS 456:2025 Concrete Code<\/span><\/span><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Review of Draft IS 456:2025 \u2014 What Every Structural Engineer Must Know<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>The Bureau of Indian Standards (BIS) has released the Preliminary Draft of IS 456:2025. This is one of the most significant transformations in Indian concrete design since the release of the IS 456:2000 code. For structural engineers in India and South Asia (including Nepal), this draft represents a monumental shift in how we approach the design, construction, and maintenance of concrete structures.<\/p>\n\n\n\n<p>As a practicing structural engineer who has examined this preliminary draft, I will break down some interesting changes. I will also try to briefly explain why these updates are set to reshape the engineering industry. From performance-based design philosophies to new material specifications and quality control processes, this draft has the potential to significantly impact how we work with reinforced concrete (RC), prestressed concrete (PSC), and composite concrete systems.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Key Changes Proposed in IS 456:2025 Draft<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>IS 456:2025 covers Structural Concrete (not just reinforced concrete)<\/strong><\/summary>\n<p>One of the most notable changes in IS 456:2025 is the expansion of the scope to include <strong>all forms of structural concrete<\/strong>. The new code will no longer focus solely on <strong>Reinforced Concrete (RC)<\/strong> but will integrate other concrete systems such as <strong>Prestressed Concrete (PSC)<\/strong> and <strong>composite concrete-steel systems<\/strong>.<\/p>\n\n\n\n<p>What are the structural concrete changes in the draft IS 456:2025 code provisions?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reinforced Concrete (RC)<\/strong>: Standard reinforced concrete design for buildings and infrastructure.<\/li>\n\n\n\n<li><strong>Prestressed Concrete (PSC)<\/strong>: All design provisions for prestressed concrete, previously covered under IS 1343, will now be incorporated into IS 456, simplifying the process.<\/li>\n\n\n\n<li><strong>Composite Concrete-Steel Systems<\/strong>: Design provisions for structures that use a combination of concrete and steel.<\/li>\n\n\n\n<li><strong>Special Concretes<\/strong>: This includes high-performance concrete (HPC), fibre-reinforced concrete, self-compacting concrete (SCC), and lightweight\/heavyweight concrete systems.<\/li>\n<\/ul>\n\n\n\n<p>Merging these distinct concrete types in one comprehensive code may help harmonize design practices and facilitate smoother project implementation for structural engineers working with varied concrete systems.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Introduction of Performance-Based Design Philosophy<\/strong><\/summary>\n<p>One of the most significant shifts in IS 456:2025 is the introduction of <strong>six distinct design criteria<\/strong>. Rather than just focusing on strength and serviceability, the new draft emphasizes a holistic performance-based approach.<\/p>\n\n\n\n<p>What are the main approaches to performance-based design in IS 456:2025?<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Safety (Strength)<\/strong>: Ensuring that structures are designed to withstand expected loads.<\/li>\n\n\n\n<li><strong>Serviceability<\/strong>: Ensuring that the structure functions well without excessive deformation or damage during its service life.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Focusing on the long-term performance of the material and structure.<\/li>\n\n\n\n<li><strong>Robustness<\/strong>: Ensuring the structure can withstand unforeseen events, such as accidental damage.<\/li>\n\n\n\n<li><strong>Integrity<\/strong>: Ensuring the structure\u2019s ability to retain its form and function under normal or extreme conditions.<\/li>\n\n\n\n<li><strong>Restorability<\/strong>: The ability of the structure to be restored to service after an event that might cause some form of damage.<\/li>\n<\/ol>\n\n\n\n<p>This shift towards performance-based design will lead to more reliable, safer, and sustainable structures, aligning Indian practice with international best standards.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Higher Material Grades &amp; Updated Material Properties<\/strong><\/summary>\n<p>IS 456:2025 introduces explicit provisions for <strong>higher concrete grades<\/strong> and <strong>updated material properties<\/strong>, bringing Indian practices in line with global trends.<\/p>\n\n\n\n<p>What are the key updates on concrete grade and properties in IS 456:2025? <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Concrete Grades up to M100<\/strong>: Previously, IS 456 focused on lower-grade concretes, but the new draft now includes provisions for high-strength concrete, allowing for more robust and efficient designs.<\/li>\n\n\n\n<li><strong>Updated Stress-Strain Curves<\/strong>: New data on the stress-strain behavior of concrete and updated creep and shrinkage values will help engineers better predict the long-term performance of concrete.<\/li>\n\n\n\n<li><strong>Steel Grades up to Fe550<\/strong>: The inclusion of high-strength steel grades up to Fe550 further improves the structural integrity and load-carrying capacity of concrete structures.<\/li>\n<\/ul>\n\n\n\n<p>These changes will allow engineers to design structures that meet the increasingly demanding requirements of modern infrastructure, ensuring better performance and material efficiency.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Increased Emphasis on Durability and Service<\/strong><\/summary>\n<p>In line with global standards, <strong>durability<\/strong> takes center stage in IS 456:2025. The new draft outlines stringent requirements to ensure that concrete structures can withstand aggressive environments over long service lives.<\/p>\n\n\n\n<p>What are the emphasized requirements in IS 456:2025 for concrete durability?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Exposure-Based Cover Requirements<\/strong>: The code introduces specific cover requirements based on environmental exposure classes, ensuring that structures are adequately protected from corrosion and other forms of degradation.<\/li>\n\n\n\n<li><strong>Limits on Water-Cement Ratio (w\/c)<\/strong>: Tighter controls on the water-cement ratio, which directly impacts concrete strength and durability.<\/li>\n\n\n\n<li><strong>Corrosion Protection<\/strong>: Enhanced measures for corrosion protection, especially for structures in coastal or industrial environments.<\/li>\n\n\n\n<li><strong>Special Concretes for Durability<\/strong>: Use of specialized concretes (e.g., high-performance concrete, fibre-reinforced concrete) to extend the life cycle of structures in aggressive environments.<\/li>\n<\/ul>\n\n\n\n<p>This heightened focus on durability will help structural engineers deliver longer-lasting, cost-effective structures that perform better over time.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Enhanced Detailing &amp; Robustness Requirements<\/strong><\/summary>\n<p>IS 456:2025 strengthens requirements for <strong>structural detailing<\/strong> and <strong>robustness<\/strong> to improve the overall safety and resilience of concrete structures.<\/p>\n\n\n\n<p>What are key additions in IS 456:2025 for structural detailing?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Crack Width Control<\/strong>: Stricter guidelines to limit crack width, improving the longevity and aesthetic quality of structures.<\/li>\n\n\n\n<li><strong>Long-Term Deflection<\/strong>: Provisions to control deflection over the lifespan of a structure, improving both safety and functionality.<\/li>\n\n\n\n<li><strong>Tie Forces &amp; Continuity<\/strong>: Enhanced requirements for tie forces and continuity in the design, ensuring the structure behaves as a whole under load.<\/li>\n\n\n\n<li><strong>Progressive Collapse Resistance<\/strong>: Provisions to prevent or mitigate progressive collapse in the event of structural failure.<\/li>\n\n\n\n<li><strong>Fire Performance<\/strong>: Updated fire-resistance requirements for concrete structures, ensuring better performance in case of fire.<\/li>\n<\/ul>\n\n\n\n<p>These guidelines are more elaborate in this edition of the code. This is expected to help structural designers make more robust calculations that result in better structural detailing.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Construction and Quality Control are More Detailed<\/strong><\/summary>\n<p>The draft introduces <strong>enhanced quality control (QC)<\/strong> requirements for contractors and construction managers, focusing on every stage of the concrete construction process.<\/p>\n\n\n\n<p>What are some quality control mechanisms introduced in IS 456:2025 code?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Batching &amp; Mixing Accuracy<\/strong>: Stricter controls on the proportions of materials to ensure consistent concrete quality.<\/li>\n\n\n\n<li><strong>Admixture Handling<\/strong>: Better guidelines for the handling and use of chemical admixtures to improve concrete performance.<\/li>\n\n\n\n<li><strong>Curing Plans<\/strong>: Detailed plans for curing to ensure proper hydration and strength development of concrete.<\/li>\n\n\n\n<li><strong>Concrete Placement &amp; Compaction<\/strong>: Tighter controls on how concrete is placed and compacted to eliminate defects such as honeycombing.<\/li>\n\n\n\n<li><strong>Enhanced Testing &amp; Acceptance Criteria<\/strong>: More rigorous testing requirements for concrete at various stages to ensure compliance with design specifications.<\/li>\n<\/ul>\n\n\n\n<p>These changes will lead to higher quality concrete, reducing the risk of defects and ensuring that structures meet or exceed their intended performance.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Pre-Stressed Concrete (PSC) Design is Included<\/strong><\/summary>\n<p>One of the most interesting changes in IS 456:2025 is the inclusion of <strong>Prestressed Concrete (PSC)<\/strong> provisions within the IS 456 code. These provisions were previously covered under <strong>IS 1343 code<\/strong>.<\/p>\n\n\n\n<p>What are the aspects of PSC design included in IS 456:2025?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Prestressing Losses<\/strong>: Different prestressing like elastic shortening, fatigue, bond-slip, etc.<\/li>\n\n\n\n<li><strong>PSC Safety Factors<\/strong>: Safety factors on loads and materials (concrete and tendons) for PSC design.<\/li>\n\n\n\n<li><strong>Tendon Details<\/strong>: Detailed data on prestressing tendons and common material grades.<\/li>\n\n\n\n<li><strong>Concrete Criteria<\/strong>: Controls on the grades of concrete and how concrete is placed and cured.<\/li>\n\n\n\n<li><strong>PSC Design Criteria<\/strong>: Rigorous requirements for prestressed concrete design including load combinations and deflection requirements.<\/li>\n<\/ul>\n\n\n\n<p>This consolidation of design codes simplifies the design process for engineers working with prestressed concrete and eliminates the need to cross-reference multiple codes.<\/p>\n<\/details>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Drawbacks or Gains of Provisions in IS 456:2025?<\/h2>\n\n\n\n<p>The <strong>IS 456:2025<\/strong> draft, released by the Bureau of Indian Standards (BIS), promises significant updates to India&#8217;s concrete design practices. While the changes are progressive and cater to the evolving needs of the construction industry, there are several concerns about the new complexity and potential drawbacks of such a substantial revision. As we move from the relatively concise <strong>IS 456:2000<\/strong> to a more intricate and detailed <strong>IS 456:2025<\/strong>, it&#8217;s crucial to evaluate whether the increased complexity and associated costs justify the long-term benefits.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Increased Complexity and Size<\/strong>\n<ul class=\"wp-block-list\">\n<li>IS 456:2000 was a concise 100 pages, but <strong>IS 456:2025<\/strong> has grown to over <strong>450 pages<\/strong>. The draft now covers <strong>prestressed concrete (PSC)<\/strong>, <strong>high-strength concrete<\/strong>, and <strong>composite systems<\/strong>, making even basic aspects like concrete cover more complex. While these additions might be relevant for specialized projects, they overcomplicate the core code, which was traditionally meant for <strong>general-purpose concrete design<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Unnecessary Integration of Specialized Topics<\/strong>\n<ul class=\"wp-block-list\">\n<li>The merging of <strong>prestressed concrete<\/strong> and <strong>high-strength concrete<\/strong> into the core IS 456 code may not be necessary for most practitioners. As in <strong>ACI<\/strong>, which separates these topics into distinct codes, India could benefit from <strong>specialized codes<\/strong> for these systems. After all, vast majority of concrete building in South Asia (including in India and Nepal) are low-rise, and even fewer projects require prestressed concrete. Including advanced topics in the base code risks overwhelming <strong>engineers with limited exposure to such concepts<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Risk of Errors in Simple Projects<\/strong>\n<ul class=\"wp-block-list\">\n<li>The added complexity may lead to mistakes, especially for engineers with <strong>only a Bachelor\u2019s degree<\/strong> and little exposure to advanced design techniques. For <strong>low-rise buildings<\/strong> and <strong>medium-scale projects<\/strong>, the draft\u2019s sophisticated provisions\u2014such as <strong>non-linear analysis<\/strong>\u2014aren\u2019t practical and could lead to <strong>design errors<\/strong>, ultimately compromising safety and efficiency.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Higher Costs and Slower Construction<\/strong>\n<ul class=\"wp-block-list\">\n<li>IS 456:2025 introduces <strong>higher material costs<\/strong> due to demands for <strong>high-strength concrete<\/strong> (up to M100) and <strong>eco-friendly cements<\/strong>. These materials require richer mixes and special additives, increasing <strong>RMC<\/strong> costs and construction time.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Increased Quality Control Expenses<\/strong>\n<ul class=\"wp-block-list\">\n<li>The draft imposes stricter <strong>quality control (QC)<\/strong> standards, leading to <strong>higher testing and compliance costs<\/strong>. Site labs and third-party testing budgets are expected to rise by <strong>10-15%<\/strong>, with financial penalties for non-compliance or rework. This adds to the initial project cost, which could be a strain for smaller projects with limited budgets.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Potential for Hidden Savings<\/strong>\n<ul class=\"wp-block-list\">\n<li>Despite the upfront costs, <strong>steel optimization<\/strong> (using higher grades like Fe550) could reduce steel tonnage by <strong>15-20%<\/strong> in high-rises, which may offset some of the higher concrete costs. Additionally, merging <strong>prestressed concrete provisions<\/strong> into IS 456 simplifies post-tensioning (PT) design, leading to <strong>thinner slabs<\/strong> and <strong>lighter foundations<\/strong> that can reduce material usage and improve structural efficiency.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>A Growing Codebase<\/strong>\n<ul class=\"wp-block-list\">\n<li>India is already moving toward <strong>fragmented codes<\/strong>, such as <strong>IS 1893<\/strong> (Seismic) and <strong>IS 13920<\/strong> (Detaining). IS 456, as the core concrete design code, should avoid becoming as complex as these specialized codes. <strong>BIS<\/strong> should consider creating <strong>separate codes<\/strong> for prestressed concrete, high-strength concrete, and composite systems to streamline design processes and reduce errors.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: A Balancing Act Between Innovation and Practicality<\/h2>\n\n\n\n<p>In conclusion, IS 456:2025 represents a significant step forward for India&#8217;s concrete design standards. This draft is bringing much-needed updates that align with global best practices in durability, material efficiency, and sustainability. There has been some criticism in that the expanded complexity and increased costs may present challenges, particularly for everyday low-rise projects. But the code\u2019s emphasis on high-performance concrete and long-term durability ultimately positions the Indian construction industry for greater resilience and safety in the face of evolving demands.<\/p>\n\n\n\n<p>It has to be noted that the integration of specialized topics like prestressed concrete and high-strength concrete into the core IS 456 code may seem burdensome. But this also provides an opportunity for a unified approach that ensures consistency and streamlines design processes for more complex structures. Overall, while initial costs may rise, the long-term value (in terms of reduced maintenance, increased lifespan, and improved safety) makes IS 456:2025 a positive evolution that will benefit infrastructure for decades to come.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Review of Draft IS 456:2025 \u2014 What Every Structural Engineer Must Know The Bureau of Indian Standards (BIS) has released the Preliminary Draft of IS 456:2025. This is one of the most significant transformations in Indian concrete design since the release of the IS 456:2000 code. For structural engineers in India and South Asia (including &#8230; <a title=\"Major Changes in New Proposed IS 456:2025 Concrete Code\" class=\"read-more\" href=\"https:\/\/blog.ersujanchapagain.com.np\/index.php\/2026\/02\/10\/major-changes-proposed-in-new-proposed-is-456-2025-concrete-code\/\" aria-label=\"Read more about Major Changes in New Proposed IS 456:2025 Concrete Code\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-68","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Major Changes in New Proposed IS 456:2025 Concrete Code - Structural Engineering Articles<\/title>\n<meta name=\"description\" content=\"Review of Draft IS 456:2025 \u2014 What Every Structural Engineer Must Know About the Major Overhaul of Concrete (RC and PSC) Design Code\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.ersujanchapagain.com.np\/index.php\/2026\/02\/10\/major-changes-proposed-in-new-proposed-is-456-2025-concrete-code\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Major Changes in New Proposed IS 456:2025 Concrete Code - 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