EN 14038-2:2020
(Main)Electrochemical realkalization and chloride extraction treatments for reinforced concrete - Part 2: Chloride extraction
Electrochemical realkalization and chloride extraction treatments for reinforced concrete - Part 2: Chloride extraction
This document specifies a procedure for carrying out impressed current electrochemical chloride extraction from chloride bearing concrete in existing structures. It is applicable to atmospherically exposed parts of structures with ordinary reinforcement and/ or post-tensioned tendon ducts embedded in concrete. In the latter case, it is essential to verify that there is no risk of hydrogen embrittlement, if necessary by conducting trials and installing monitoring during the treatment.
This document does not apply to concrete containing pre-stressing steel, which can suffer hydrogen embrittlement during chloride extraction, or to concrete containing coated or galvanized reinforcement.
In case of post-tensioned, pre-stressing concrete, the endangered tendon strands can be shielded by the tendon ducts from unwanted and/or exceeded polarization into the cathodic range and respective water reduction.
Elektrochemische Realkalisierung und Chloridextraktionsbehandlungen für Stahlbeton - Teil 2: Chloridextraktion
Dieses Dokument legt ein Verfahren zur elektrochemischen Chloridextraktion aus chloridhaltigem Beton in bestehenden Bauwerken mittels Fremdstrom fest. Es ist anzuwenden an atmosphärisch exponierten Bauteilen von Bauwerken, welche schlaff bewehrt und/oder als Spannbeton mit nachträglichem Verbund ausgeführt sind. Im letztgenannten Fall muss überprüft werden, dass keine Gefahr von Wasserstoffversprödung besteht; falls notwendig kann dies durch die Durchführung von Probeanwendungen und die Installation von Überwachungsgeräten während der Behandlung erreicht werden.
Dieses Dokument ist nicht anwendbar auf Spannbeton mit sofortigem Verbund, der während der Chloridextraktion der Wasserstoffversprödung unterliegen kann, oder auf Beton mit galvanisch oder anderweitig beschichteter Bewehrung.
Im Fall von Spannbeton mit nachträglichem Verbund können gefährdete Spannglieder durch deren Lage im Hüllrohr vor unerwünschter und/oder zu starker kathodischer Polarisation und entsprechender Wasserreduktion geschützt sein.
Réalcalinisation électrochimique et traitements d’extraction des chlorures applicables au béton armé - Partie 2 : Extraction des chlorures
Le présent document spécifie une procédure d’extraction électrochimique par courant imposé des chlorures contenus dans des bétons d’ouvrages existants. Il est applicable à des éléments de structure exposés au milieu ambiant contenant des armatures ordinaires et/ou à des gaines de câbles de post-tension noyées dans le béton. Dans le dernier cas, il est essentiel de vérifier qu’il n’y a pas de risque de fragilisation due à l’hydrogène, en réalisant si nécessaire des essais et en assurant une surveillance pendant le traitement.
Le présent document ne s’applique ni au béton contenant des aciers de précontrainte qui peuvent subir une fragilisation par l’hydrogène lors de l’extraction des chlorures, ni au béton contenant des armatures revêtues ou galvanisées.
Dans le cas du béton précontraint par post-tension, les torons menacés peuvent être protégés par des gaines contre la polarisation indésirable et/ou excessive dans le domaine cathodique et contre la réduction de l’eau associée.
Elektrokemična realkalizacija in postopki kloridne ekstrakcije za armirani beton - 2. del: Kloridna ekstrakcija
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST-TS CEN/TS 14038-2:2012
Elektrokemična realkalizacija in postopki kloridne ekstrakcije za armirani beton - 2.
del: Kloridna ekstrakcija
Electrochemical realkalization and chloride extraction treatments for reinforced concrete
- Part 2: Chloride extraction
Elektrochemische Realkalisierung und Chloridextraktionsbehandlungen für Stahlbeton -
Teil 2: Chloridextraktion
Réalcalinisation électrochimique et traitements d'extraction des chlorures applicables au
béton armé - Partie 2 : Extraction des chlorures
Ta slovenski standard je istoveten z: EN 14038-2:2020
ICS:
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 14038-2
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2020
EUROPÄISCHE NORM
ICS 91.100.30 Supersedes CEN/TS 14038-2:2011
English Version
Electrochemical realkalization and chloride extraction
treatments for reinforced concrete - Part 2: Chloride
extraction
Réalcalinisation électrochimique et traitements Elektrochemische Realkalisierung und
d'extraction des chlorures applicables au béton armé - Chloridextraktionsbehandlungen für Stahlbeton –
Partie 2 : Extraction des chlorures Teil 2: Chloridextraktion
This European Standard was approved by CEN on 14 September 2020.
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 COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14038-2:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 7
5 General . 7
5.1 Quality management systems . 7
5.2 Personnel . 7
6 Assessment and repair of the structure . 8
6.1 General . 8
6.2 Review of records . 8
6.3 Inspection . 8
6.4 Assessment of corrosion activity . 9
6.5 Determination of chloride content . 9
6.6 Visual inspection of the rebar surface and carbonation depth measurement . 9
6.7 Concrete cover thickness and reinforcement location measurements . 10
6.8 Alkali aggregate reaction . 10
6.9 Reinforcement continuity and size . 10
6.10 Repair . 10
6.10.1 General . 10
6.10.2 Concrete removal . 10
6.10.3 Reinforcement preparation . 11
7 Materials and equipment . 11
7.1 Calibration of instrumentation . 11
7.2 Anode system . 11
7.2.1 General . 11
7.2.2 Anode . 11
7.2.3 Anode zone . 11
7.2.4 Alkaline electrolyte solution . 11
7.3 Electric cables . 12
7.4 Power supply . 12
8 Installation procedures . 13
8.1 Electrical continuity . 13
8.2 Other metallic parts within the treatment area . 13
8.3 Performance monitoring . 13
8.4 Installation of the anode system . 13
8.5 Protection of electrolyte solution . 13
8.6 Electrical installation . 13
8.7 Preliminary testing and documentation . 14
9 Commissioning, operation and termination of treatment . 14
9.1 Visual inspection . 14
9.2 Safety precautions . 14
9.3 Energizing and adjustment of current output . 14
9.4 Routine inspection and maintenance . 15
9.5 Chloride extraction process monitoring . 15
9.6 Termination of treatment . 15
10 Final report . 17
11 Post-treatment coating and monitoring . 18
Bibliography . 19
European foreword
This document (EN 14038-2:2020) has been prepared by 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 April 2021, and conflicting national standards shall be
withdrawn at the latest by April 2021.
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 CEN/TS 14038-2:2011.
EN 14038, Electrochemical realkalization and chloride extraction treatments for reinforced concrete is
currently composed of the following parts:
— Part 1: Realkalization;
— Part 2: Chloride extraction.
In comparison with CEN/TS 14038-2:2011, the following changes have been made:
a) Clause 2 “Normative references” has been revised;
b) Clause 4 “Principle”, Clause 6 “Assessment and repair of the structure” has been revised;
c) 7.2.2 “Anode” has been complemented by requirements for the used anodes;
d) Requirements for anode zones have been added to 7.2.3 “Anode zone”;
e) A note has been added to 7.4 “Power supply”;
f) Clause 8 “Installation procedures” has been revised;
g) Clause 9 “Commissioning, operation and termination of treatment” has been revised, especially 9.6
“Termination of treatment”;
h) Clause 10 “Final report” and Clause 11 “Post-treatment coating and monitoring” have been revised;
i) Bibliography has been supplemented with several publications;
j) Document has been revised editorially.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
Introduction
The purpose of chloride extraction is to rehabilitate a reinforced concrete part from corrosion activity
non-destructively and to provide long term corrosion protection of steel reinforcement in concrete
which has been affected by chloride. The duration of the treatment is from several weeks up to as much
as several months, depending on the amount and ingress depth of accumulated chloride, the
permeability of the concrete, the layout of the reinforcement and other factors.
NOTE Based on experience, in case of a cover thickness of 30 mm to 40 mm and a concentration of chloride in
the cover zone, an ECE can be done successfully in a one-stage treatment of 4 to 6 weeks.
There are other electrochemical procedures that can be used to provide corrosion protection to steel in
concrete structures. These include cathodic protection and re-alkalization. There are European
standards for cathodic protection of steel in concrete (EN ISO 12696) and for the re-alkalization of
carbonated concrete (EN 14038-1).
It has been assumed in the drafting of this document that design and execution of a chloride extraction
application will be entrusted to appropriately qualified, competent and experienced people, for whose
use it has been prepared.
1 Scope
This document specifies a procedure for carrying out imp
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