One method to rehabilitate chloride-contaminated reinforced concrete structures is electrochemical chloride extraction, by which chloride ions are extracted from the pore system of the concrete using an externally applied voltage. Although many factors influence the efficacy of electrochemical chloride extraction, a number of these, such as the concrete cover and the chloride profile, are predefined by the structure. One factor with major influence that can be improved is the coupling material. In this contribution, we present a suitable coupling material in the form of a highly alkaline hydrogel, with which the applied voltage can be reduced from 40–50 to 1 V under laboratory conditions. The reduction is due to the high conductivity of the gel and its excellent electrolytic contact with concrete. In a field test on chloride-infested car-park columns, more than 95% of the chloride could be extracted with 2–3 cycles, each comprising of 21 days of extraction and 7 days of rest. During the entire treatement, the gel did not require any attending to, such as replacing evaporated moisture.

中文翻译：

---

碱性水凝胶作为离子传导耦合材料用于氯化物电化学萃取

一种修复受氯化物污染的钢筋混凝土结构的方法是电化学氯化物提取，通过该方法使用外部施加的电压从混凝土的孔隙系统中提取氯离子。尽管许多因素会影响电化学氯化物提取的功效，但其中一些因素（例如混凝土覆盖层和氯化物剖面）是由结构预先确定的。可以改进的具有主要影响的因素之一是耦合材料。在这个贡献中，我们以高碱性水凝胶的形式提出了一种合适的耦合材料，在实验室条件下，施加的电压可以从 40-50 V 降低到 1 V。减少是由于凝胶的高导电性及其与混凝土的良好电解接触。在对氯化物污染的停车场柱子进行的现场测试中，可以通过 2-3 个循环提取超过 95% 的氯化物，每个循环包括 21 天的提取和 7 天的休息。在整个治疗过程中，凝胶不需要任何注意，例如替换蒸发的水分。