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/m2 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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