A State-of-the-Art Review of Electrochemical Chloride Extraction for Concrete Structures — Oak Academic Publishing
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A State-of-the-Art Review of Electrochemical Chloride Extraction for Concrete Structures
iBMB (Institute of Building Materials, Concrete Constructions and Fire Safety), Division of Concrete Construction, TU Braunschweig, Braunschweig, Germany
1 iBMB (Institute of Building Materials, Concrete Constructions and Fire Safety), Division of Concrete Construction, TU Braunschweig, Braunschweig, Germany
Electrochemical chloride extraction is a promising technique for the rehabilitation of concrete structures under chloride induced corrosion. This study consists of an extensive literature review of this treatment including application cases. It is found that the rate of chlorides removed is affected by the total charge passed, whereas increasing charge in a range between 1500 to 2000 Ah/m 2 increases the amount of chlorides removed and this can be more effective by increasing current density instead of duration of treatment. Bound chlorides are extracted during treatment and, water works better than Ca(OH) 2 as an electrolyte, possibly due to modifications on the concrete pore structure. Moreover, ECE is not efficient in repassivate structures but is efficient in its purpose of removing chlorides if treatment setup is well planned, which justifies the need for better international standards on the topic.
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