ISO INTERNATIONAL STANDARD 12696 Third edition 2022-05 Cathodic protection of steel in concrete Protection cathodique de I'acier dans le beton Reference number IS0 12696:2022(E) ISO @IS02022 IS0 12696:2022(E) COPYRIGHT PROTECTED DOCUMENT IS02022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may the internet or an intranet, withoutpriorwrittenpermission.Permission can be requested from eitherIso at the addressbelow or Iso's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214Vernier,Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org PublishedinSwitzerland i @ IS0 2022 - All rights reserved IS0 12696:2022(E) Contents Page Foreword .V Introduction .vi 1 Scope. .1 2 Normative references ..1 3 Terms and definitions .2 4 General .3 4.1 Quality management. 3 4.2 Persons .3 4.3 Design.. 3 5 Structure assessment and repair .4 5.1 General ..4 5.2 Records. 4 5.3 Visual inspection and delamination survey 4 5.4 Chloride analysis 4 5.5 Carbonationdepthmeasurement .4 5.6 Concrete cover and reinforcement location 5 5.7 Reinforcement electrical continuity. 5 5.8 Steel/concrete potential 5 5.9 Concrete electrical resistivity 5 5.10 Repair.... 6 5.10.1 General 6 5.10.2 Concrete removal .6 5.10.3 Reinforcement preparation 6 5.10.4 Concrete reinstatement 6 5.11 Cementitious overlay 7 5.12 New structures. 7 6 Cathodic protection system components .8 6.1 General. 8 6.2 Anode systems .8 6.2.1 General .8 6.2.2 Conductive coating anode systems 9 6.2.3 Activated titanium anode systems 10 6.2.4 Titania ceramic anodes. 11 6.2.5 Conductive cementitious anodes 11 6.2.6 Embedded galvanic anodes 11 6.2.7 Surface-mountedgalvanicanodes 12 6.2.8 Buriedandimmersedanodes. 12 6.3 Monitoring sensors. 14 6.3.1 General 14 6.3.2 Portable reference electrodes 15 6.3.3 Other sensors 15 6.4 Monitoring instrumentation 16 6.4.1 General 16 6.4.2 Digital meters. .16 6.4.3 Data loggers. .16 6.5 Data management system 17 6.6 Direct current cables 18 6.7 Junctionboxes. .19 6.8 Power supplies 19 6.9 Transformer-rectifiers 19 7 Installation procedures. 21 7.1 Electrical continuity 21 @ IS0 2022 - All rights reserved iii IS0 12696:2022(E) 7.2 Performance monitoring system 21 7.3 Connectionstosteelinconcrete .22 7.4 Concrete repairs associated with the cathodic protection components 22 7.5 Surface preparation for anode installation .22 7.6 Anode installation. 23 7.7 Connections to the anode system. 23 7.8 Anode overlay, surface sealant or decorative coating application. 23 7.9 Electrical installation .24 7.10 Testing during installation ..25 8 Commissioning. .25 8.1 Visual inspection .25 8.2 Pre-energizing measurements .25 8.3 Initial energizing of impressed current systems. 26 8.4 Initial adjustment of impressed current systems. 26 8.5 Initial performance assessment .27 8.6 Criteria of protection: Interpretation of performance assessment data .28 9 System records and documentation .29 9.1 Quality and test records. .29 9.2 Installation and commissioning report .29 9.3 Operation and maintenance manual .30 10 Operation and maintenance ..30 10.1 Intervals and procedures .30 10.2 System review. .31 10.3 System review report .31 Annex A (informative) Principles of cathodic protection and its application to steel in concrete .32 Annex B (informative) Design process ..40 AnnexC(informative)Notesonanodesystems ..47 Annex D (informative) Notes on reference electrodes ..52 Bibliography .56 iv IS02022-All rights reserved IS0 12696:2022(E) 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 o