National foreword

This British Standard is the UK implementation of EN ISO 12696:2022. It is identical to ISO 12696:2022. It supersedes BS EN ISO 12696:2016, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee GEL/603, Cathodic protection.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2022.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 219,Cathodic protection of steel in concrete, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 12696:2016), which has been technically revised.

The main changes compared to the previous edition are as follows:

the scope has been revised to clarify that, in order to comply with this document, it is necessary for the cathodic protection system to have sufficient monitoring provisions to demonstrate that the system meets the criteria of protection specified in 8.6;
subclause 8.6 has been revised;
Annex A has been revised and its figures have been updated;
Clause A.7 has been moved to the new Annex D and a new Clause A.7 “Benefits of cathodic protection current when criteria in 8.6 are not fully met” has been added;
Annex B has been revised completely;
a new clause, Clause C.5 “Hybrid anodes”, has been added;
a new annex, Annex D “Notes on reference electrodes”, has been added;
the references in the whole document have been revised.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

This document applies to cathodic protection of steel in concrete, with the concrete atmospherically exposed, buried or immersed.

As the criteria of protection for steel in buried or immersed concrete are those applicable to cathodic protection of steel in atmospherically exposed concrete, this revision of ISO 12696:2016 incorporates cathodic protection of steel in buried and immersed concrete. The provision of cathodic protection current can often be more economically provided to steel in buried and immersed concrete by using buried or immersed anode systems detailed in International Standards for buried and immersed steel structures, rather than the anode systems that are suitable for applications to steel in atmospherically exposed concrete. Therefore, reference is made to other International Standards in this respect while the cathodic protection performance criteria for steel in concrete are specified in this document for all exposures.

There are other electrochemical treatments intended to provide corrosion control for steel in concrete. These techniques include re-alkalization and chloride extraction and are not incorporated in this document. See EN 14038‑1:2016^[¹⁰^] and EN 14038‑2:2020^[¹¹^] for information on electrochemical treatments.

Cathodic protection of steel in concrete is a technique that has been demonstrated to be successful in appropriate applications in providing cost effective long-term corrosion control for steel in concrete. It is a technique that requires specific design calculations and definition of installation procedures in order to be successfully implemented. This document does not represent a design code for cathodic protection of steel in concrete, but represents a performance standard for which it is anticipated that a detailed design and specification for materials, installation, commissioning and operation will be prepared by experts and experienced persons.

This European Standard was approved by CEN on 5 May 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

European foreword

This document (EN ISO 12696:2022) has been prepared by Technical Committee ISO/TC 156 "Corrosion of metals and alloys" in collaboration with Technical Committee CEN/TC 219 “Cathodic protection” the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2022, and conflicting national standards shall be withdrawn at the latest by November 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 12696:2016.

Any feedback and questions on this document should be directed to the users’ national standards body/national committee. A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 12696:2022 has been approved by CEN as EN ISO 12696:2022 without any modification.

1 Scope

This document specifies performance requirements for cathodic protection of steel in cement-based concrete, in both new and existing structures. It covers building and civil engineering structures, including carbon steel reinforcement and prestressed reinforcement embedded in the concrete. It is applicable to uncoated steel reinforcement and to organic-coated steel reinforcement. It is not applicable to reinforced concrete containing electrically conductive fibres (e.g. carbon or steel).

This document applies to steel embedded in atmospherically exposed, buried, immersed and tidal elements of buildings or structures.

This document is only applicable to the applications of cathodic protection to steel in concrete which are designed with the intention to, and can be demonstrated to, meet the criteria of protection specified in 8.6. This requires the provision of sufficient performance monitoring systems as specified in 6.3 to all parts of the structure intended to be protected, in order to assess the extent to which the criteria in 8.6 are met.

This document does not apply to galvanic anodes or systems applied into patch repairs to reduce the effects of ‘incipient anodes’. This document does also not apply to any form of cathodic protection systems or other electrochemical treatments that either cannot meet the requirements of 8.6 or are not provided with the performance monitoring systems (see 6.3) that are necessary to assess whether the criteria of protection specified in 8.6 are met.

NOTE 1 Annex A gives guidance on the principles of cathodic protection and its application to steel in concrete.

NOTE 2 This document, while not specifically intended to address cathodic protection of steel in any electrolyte except concrete, can be applied to cathodic protection of steel in other cementitious materials such as are found, for example, in early 20^th century steel-framed masonry, brick and terracotta clad buildings. In such applications, additional considerations specific to these structures are required in respect of design, materials and installation of cathodic protection; however, the requirements of this document can be applied to these systems.

2 Normative references

3 Terms and definitions

4 General

4.1 Quality management

4.2 Persons

4.3 Design

5 Structure assessment and repair

5.1 General

5.2 Records

5.3 Visual inspection and delamination survey

5.4 Chloride analysis

5.5 Carbonation depth measurement

5.6 Concrete cover and reinforcement location

5.7 Reinforcement electrical continuity

5.8 Steel/concrete potential

5.9 Concrete electrical resistivity

5.10 Repair

5.11 Cementitious overlay

5.12 New structures

6 Cathodic protection system components

6.1 General

6.2 Anode systems

6.3 Monitoring sensors

6.4 Monitoring instrumentation

6.5 Data management system

6.6 Direct current cables

6.7 Junction boxes

6.8 Power supplies

6.9 Transformer-rectifiers

7 Installation procedures

7.1 Electrical continuity

7.2 Performance monitoring system

7.3 Connections to steel in concrete

7.4 Concrete repairs associated with the cathodic protection components

7.5 Surface preparation for anode installation

7.6 Anode installation

7.7 Connections to the anode system

7.8 Anode overlay, surface sealant or decorative coating application

7.9 Electrical installation

7.10 Testing during installation

8 Commissioning

8.1 Visual inspection

8.2 Pre-energizing measurements

8.3 Initial energizing of impressed current systems

8.4 Initial adjustment of impressed current systems

8.5 Initial performance assessment

8.6 Criteria of protection: Interpretation of performance assessment data

9 System records and documentation

9.1 Quality and test records

9.2 Installation and commissioning report

9.3 Operation and maintenance manual

10 Operation and maintenance

10.1 Intervals and procedures

10.2 System review

10.3 System review report

Bibliography

BS EN ISO 12696:2022

Cathodic protection of steel in concrete

Current

Published:

30 Jun 2022