ISO 19338:2025

Overview

ISO 19338:2025 - Performance requirements for standards on concrete structures - defines high‑level performance principles and verification methods intended to align international design, assessment and construction requirements for concrete structures. The fourth edition expands scope to include performance requirements for assessment of existing concrete structures and adds new guidance on life‑cycle management, sustainability and durability. ISO 19338:2025 is a reference framework for developing or harmonizing standards that specify how concrete structures should perform over their service life.

Key Topics and Requirements

ISO 19338:2025 sets out structured performance requirements rather than prescriptive solutions. Major technical topics include:

• Principles and general requirements - guidance on translating societal and owner expectations into measurable performance objectives (structural concept, integrity, workmanship, quality assurance).
• Performance requirements and criteria - required performance for structural safety, serviceability, restorability, durability, fire resistance and fatigue, with criteria for expressing those requirements.
• Loadings and actions - treatment of permanent, variable, accidental, seismic, wind and construction loads, including action combinations and load factors.
• Resistance and materials - resistance calculation approaches for flexure, shear, bond/anchorage, bearing, and partial safety factors for materials.
• Performance evaluation methods - acceptable verification routes including theoretical, numerical and experimental analysis for ultimate and serviceability limit states.
• Special systems and detailing - requirements for precast and prestressed concrete, detailing rules, prestress losses and grouting, and earthquake‑resistant design and assessment.
• Durability, fire and sustainability - service life concepts, environmental actions and sustainability evaluation (with an informative Annex on sustainability).
• Construction and quality control - construction requirements and quality assurance provisions for ensuring intended performance in practice.

Practical Applications and Who Uses It

ISO 19338:2025 is used to develop or revise national and international design and assessment standards and to harmonize technical requirements across jurisdictions. Typical users:

• Standards organizations and technical committees (for drafting or aligning design and assessment standards)
• Structural engineers and designers (to interpret performance objectives and verification methods)
• Bridge and building assessors (evaluating existing concrete structures against performance criteria)
• Contractors, precast and prestressing specialists (quality control, workmanship and detailing)
• Owners, asset managers and regulators (defining service life and sustainability targets)
• Test laboratories and research bodies (applying experimental and numerical evaluation methods)

Related Standards (applicable)

ISO 19338:2025 is intended to be used alongside other national and international concrete design and assessment codes and the body of ISO/TC 71 work on concrete, reinforced and prestressed concrete. It provides a performance‑based framework to support harmonization of those prescriptive codes and standards.

Keywords: ISO 19338:2025, concrete structures, performance requirements, design, assessment, durability, service life, fire resistance, seismic design, quality control, sustainability.