電化學去鹽技術可行性評估

The Feasibility Evaluation of Electrochemical Chloride Removal Technique

國內有不少結構物之混凝土氯離子含量偏高，造成鋼筋生銹，混凝土龜裂，使得結構物之壽命減少許多。電化學去鹽技術為解決此問題的方法之一，本研究探討以NaOH及H3BO3為電解液時，去鹽電解液溫度、通電時間、混凝土保護層厚度以及混凝土中含有模板釘對電化學去鹽效果之影響。並評估以Na2CO3為電解液去鹽後於實驗室靜置14個月後之氯離子分佈、鹼骨材反應以及中性化對固定態氯離子的影響。

Serious corrosion of the reinforcing steel in concrete could be resulted by ingress of chlorides due to coastal exposure and by use of untreated sea degraded aggregates as construction material. It eventually endangers the integrity of the concrete structure. This paper discusses the influences of several key parameters on the effectiveness of electrochemical chloride removal technique, including NaOH and H3BO3 electrolyte temperature, concrete cover thickness, and the interference of mold nails. This study also evaluates the influences of treatment duration and ASR reaction on chloride distribution of concrete which had been desalted by Na2CO3 electrolyte 14 months ago. The effect of carbonation on bounded chlorides was also evaluated.