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BS EN 14038-2:2020:2021 Edition

BS EN 14038-2:2020:2021 Edition

$142.49

Electrochemical realkalization and chloride extraction treatments for reinforced concrete – Chloride extraction

Published By Publication Date Number of Pages
BSI 2021 28
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
3 Terms and definitions
9 4 Principle
5 General
5.1 Quality management systems
5.2 Personnel
10 6 Assessment and repair of the structure
6.1 General
6.2 Review of records
6.3 Inspection
11 6.4 Assessment of corrosion activity
6.5 Determination of chloride content
6.6 Visual inspection of the rebar surface and carbonation depth measurement
12 6.7 Concrete cover thickness and reinforcement location measurements
6.8 Alkali aggregate reaction
6.9 Reinforcement continuity and size
6.10 Repair
6.10.1 General
6.10.2 Concrete removal
13 6.10.3 Reinforcement preparation
7 Materials and equipment
7.1 Calibration of instrumentation
7.2 Anode system
7.2.1 General
7.2.2 Anode
7.2.3 Anode zone
7.2.4 Alkaline electrolyte solution
14 7.3 Electric cables
7.4 Power supply
15 8 Installation procedures
8.1 Electrical continuity
8.2 Other metallic parts within the treatment area
8.3 Performance monitoring
8.4 Installation of the anode system
8.5 Protection of electrolyte solution
8.6 Electrical installation
16 8.7 Preliminary testing and documentation
9 Commissioning, operation and termination of treatment
9.1 Visual inspection
9.2 Safety precautions
9.3 Energizing and adjustment of current output
17 9.4 Routine inspection and maintenance
9.5 Chloride extraction process monitoring
9.6 Termination of treatment
19 10 Final report
20 11 Post-treatment coating and monitoring

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BS EN 14038-2:2020
$142.49