Reinforced concrete structures in chloride environment are prone to be deteriorated because of chloride ingression. For the existing structures polluted by chloride, chloride could be extracted by electrochemical treatment. Electrochemical chloride extraction (ECE) can suspend the deterioration process, by which the durability could be improved effectively. Experimental research shows that during the chloride extraction, the other ions migrate due to electric potential gradient. Thus the

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... ructure of concrete changed inevitably. The chloride extracting efficiency at early age is higher, and the discharged chloride is less and less. The chloride discharging rate is related with the voltage. Higher voltage and current density can accelerate the chloride extraction, and the total amount of extracted chloride is more than lower voltage and current. SEM analysis finds the microstructure close to the steel turns looser. The migration of chloride and other substances is confirmed through energy dispersive x-ray analysis (EDAX).