ISO 16311-1:2024

Overview

ISO 16311-1:2024 - Maintenance and repair of concrete structures - Part 1: General principles provides the framework and overarching principles for maintaining and repairing existing concrete structures. It applies to unreinforced and reinforced concrete, prestressed concrete, and steel–concrete composite structures or their members. The document distinguishes long‑term deterioration (the main target of maintenance) from short‑term damage (e.g., earthquake or impact damage) and defines the basic concept of repair to restore structural performance. It excludes purely aesthetic or serviceability activities without direct impact on durability and service life (e.g., cleaning drains, repainting) and does not cover defects during construction of new structures.

Key topics and requirements

ISO 16311-1 sets out high‑level requirements and topics that guide practical maintenance and repair work:

• Maintenance planning: timing, maintenance categories and formulation of maintenance plans for existing structures.
• Assessment: preparing assessment plans, levels and categories of assessment, investigation techniques, registration of condition, evaluation and decision‑making.
• Repair planning and design: options for remedial actions, factors to consider, strategy selection, methods and material/property considerations.
• Execution: requirements for preparation of substrates and reinforcement, application of repair materials and systems, structural stability during works, quality control and post‑repair maintenance.
• Competence and roles: expectations for qualified personnel involved in planning, assessment, design and execution.
• Recording and documentation: formats, items to keep, preservation periods and accessibility of records.
• Informative annexes provide an extended hierarchy of related standards, terms and maintenance categories.

Practical applications and users

ISO 16311-1 is intended for stakeholders involved in the lifecycle management of concrete assets:

• Asset owners and facility managers developing or updating maintenance plans and life‑cycle strategies.
• Structural and repair engineers assessing condition, selecting repair strategies and specifying works.
• Contractors and site supervisors implementing repair execution and quality control.
• Inspectors, maintenance planners and public authorities overseeing safety and service life of bridges, parking structures, marine structures, tunnels, buildings and other concrete infrastructure. Practical benefits include consistent assessment workflows, informed decision‑making for cost‑effective repairs, improved durability and extended service life of concrete structures.

Related standards

• ISO 16311-2: Assessment of existing concrete structures
• ISO 16311-3: Design of repairs
• ISO 16311-4: Execution of repairs
• ISO 22040: Life cycle management of concrete structures

Keywords: ISO 16311-1, maintenance and repair of concrete structures, concrete deterioration, assessment, repair planning, structural performance, service life.