ISO 16311-2:2024

Overview

ISO 16311-2:2024 - "Maintenance and repair of concrete structures - Part 2: Assessment of existing concrete structures" - defines a structured, repeatable process for assessing the condition and structural performance of existing concrete works. The standard covers the full assessment cycle: planning, site and laboratory investigation, evaluation and verification, prediction of future behaviour, recommendations and reporting. It is the second edition (2024) and updates the 2014 edition (notably by adding prediction as a formal clause).

Key technical topics and requirements

• Framework of assessment: staged approach with preliminary and detailed assessment levels, definition of objectives, selection of scenarios and decision-making principles.
• Investigation and data collection: planning and execution of site inspections, condition registration, and laboratory testing; documentation of symptoms, defects and deterioration.
• Evaluation and verification: methods for evaluating actions (loads, environmental effects), material properties (concrete, reinforcement), structural details and verifying structural performance against required criteria.
• Prediction: estimating future condition and remaining service life to support maintenance and repair planning (new in 2024 edition).
• Reporting and recommendations: standardized formats for assessment results, condition-level and consequence-level reporting, recommended interventions and brief repair principles.
• Annexes and examples: informative annexes provide assessment levels, investigative tests, condition/consequence levels, evaluation guidance, recommendation examples and report content templates.

Note: the standard does not cover qualification of personnel, contractual matters, or worker health & safety requirements.

Practical applications and target users

ISO 16311-2 is used whenever an assessment of an existing concrete structure is required, including:

• Change of use or extension of service life
• Deterioration from corrosion, fatigue or time-dependent actions
• Safety/serviceability checks for earthquakes, increased traffic or regulatory requirements
• Damage from accidental actions (see ISO 2394)

Primary users:

• Structural and forensic engineers
• Asset/maintenance managers and owners
• Inspection teams and testing laboratories
• Bridge and infrastructure authorities
• Insurers and risk assessors
• Repair designers and contractors (as input to ISO 16311-3 and -4)

Related standards

• ISO 13822:2010 - Bases for design of structures - Assessment of existing structures
• ISO 16311-1 - General principles for maintenance and repair of concrete structures
• ISO 16311-3 - Design of repairs
• ISO 16311-4 - Execution of repairs
• ISO 2394 - General principles on reliability for structures

Keywords: ISO 16311-2, assessment of existing concrete structures, condition assessment, structural performance verification, concrete repair standards.