PD ISO TR 22861-2025 PDF

Full title and description

PD ISO TR 22861:2025 — Guidance on marine environment zonation for steel corrosion embedded in concrete. This technical report provides a methodology and supporting test procedure for dividing coastal and offshore marine environments into exposure zones to assess and manage steel corrosion risk in reinforced concrete structures.

Abstract

This technical report sets out a methodology for exposure-zone division of reinforced concrete structures in marine environments, based on a test procedure contained in the document. It is intended for coastal and offshore marine area zonation; it is not intended to apply to typhoon, strong-tide and certain other extreme marine conditions. Examples illustrating the methodology are provided in annexes.

General information

• Status: Published / Current
• Publication date: October 2025 (ISO publication record: 2025-10)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 77.060 — Corrosion of metals
• Edition / version: Edition 1 (2025)
• Number of pages: 17 (technical report)

Core bibliographic and status details as recorded by ISO.

Scope

Provides guidance and a practical methodology to divide marine environments (coastal and offshore) into exposure zones for the purpose of assessing and managing corrosion of steel embedded in concrete. The report describes a test procedure on which the zonation is based, gives applicability limits (excludes certain extreme conditions such as typhoon and very strong tidal zones), and includes illustrative examples in annexes to show how the methodology can be applied in practice.

Key topics and requirements

• Methodology for marine environment zonation specifically aimed at assessing corrosion risk for steel embedded in concrete.
• Defined test procedure(s) that underpin exposure-zone classification and practical application guidance.
• Application limited to coastal and offshore environments; explicit exclusion of some extreme marine conditions (e.g., typhoon, very strong tides).
• Illustrative examples and annex material to demonstrate zonation outcomes and use cases.
• Cross-references to related standards and test methods used in corrosion and concrete assessment practice.

Typical use and users

Used by structural and corrosion engineers, asset owners and operators of coastal/offshore infrastructure, inspection and maintenance planners, durability specialists, standards committees, and researchers studying reinforced-concrete deterioration in marine environments. The report helps specify exposure conditions, select appropriate materials and protective measures, and inform inspection/monitoring strategies.

Related standards

Standards commonly used with or referenced by this report include ISO standards on concrete and reinforcement specification and corrosion protection (for example ISO 22965 series, ISO 6935 series) and practice documents on cathodic protection and corrosion testing; the report also references relevant test methods such as ASTM C876-type assessments in practical guidance. Listings of related publications and normative references appear in national adoption records and distributor summaries.

Keywords

marine environment zonation, corrosion, reinforced concrete, embedded steel, exposure zones, coastal structures, offshore structures, durability, test procedure, ISO TR 22861:2025.

FAQ

Q: What is this standard?

A: PD ISO TR 22861:2025 is a technical report published by ISO that provides guidance and a test-based methodology to divide marine environments into exposure zones for assessing corrosion of steel embedded in concrete.

Q: What does it cover?

A: It covers a zonation methodology and associated test procedure for coastal and offshore marine environments, with illustrative annexes; it explicitly excludes certain extreme marine conditions such as typhoon and very strong tidal areas.

Q: Who typically uses it?

A: Structural and corrosion engineers, inspection and maintenance planners, asset owners/operators of marine infrastructure, material and durability specialists, and researchers who need a consistent approach to classify exposure and inform design, specification and protection measures.

Q: Is it current or superseded?

A: It is a current technical report published in 2025 (Edition 1, publication recorded as 2025-10). No superseding edition is recorded at the time of publication.

Q: Is it part of a series?

A: It is published as an ISO Technical Report (TR) and is related by subject to other ISO standards addressing concrete specification, reinforcement and corrosion protection (for example the ISO 22965 and ISO 6935 series and related documents on cathodic protection and testing).

Q: What are the key keywords?

A: Marine zonation, corrosion of steel in concrete, exposure classification, coastal/offshore, reinforced concrete durability, test procedure.