无机盐种类对混凝土电阻率的影响

发布时间：2018-05-19 08:50

本文选题：混凝土 + 电阻率　；参考：《科学技术与工程》2017年34期

【摘要】：对于电网中接地金属的保护课题,考虑利用混凝土包裹扁钢制成接地模块的形式来解决。由于混凝土本身具有较高的电阻率,不能达到良好的接地效果,为此针对这一问题,参考化学降阻剂的成分,以向混凝土中添加无机盐的形式来达到降低其电阻率的目的。试验研究了9种常见的无机盐对混凝土电阻率的影响,分别为阳离子K~+、Na~+、Mg~(2+)和阴离子SO_4~(2-)、Cl~-、CO_3~(2-)的两两相互组合。同时依据氯盐含量对于钢筋腐蚀速率的影响关系,设定盐的添加剂量均为水泥用量的4%。利用无添加剂混凝土组作为对照,分析电阻率降低的效果。试验结果表明添加无机盐可降低混凝土的电阻率,且得出了这9种无机盐在添加相同质量分数时降低混凝土电阻率效果的优劣关系;其中效果最好的无机盐添加剂为K_2SO_4,添加后混凝土电阻率降低至不添加时的37.9%。
[Abstract]:For the protection of grounding metal in power grid, the paper considers the form of earthing module made of concrete wrapped flat steel. Due to the high resistivity of concrete, it can not achieve good grounding effect. In order to solve this problem, the resistivity of concrete can be reduced by adding inorganic salt to the concrete with reference to the composition of chemical resistance reducer. The effects of nine common inorganic salts on the resistivity of concrete are studied in this paper. They are the pairwise combination of cation K ~ + Na ~ + MgO _ 2) and anionic so _ 4 / C _ (4) C _ (C) -C _ (3) O _ (3) / C _ (2). At the same time, according to the influence of chloride content on the corrosion rate of steel bar, the additive amount of salt is 4% of cement content. The effect of resistivity reduction was analyzed by using non-additive concrete group as control. The test results show that adding inorganic salt can reduce the resistivity of concrete, and the relationship between the effect of reducing the resistivity of concrete with the same mass fraction of the 9 kinds of inorganic salts is obtained. The most effective inorganic salt additive is K _ 2SO _ 4, and the resistivity of concrete decreases to 37.9 when it is added.
【作者单位】：华北电力大学电气与电子工程学院;
【基金】：国家自然科学基金(51277063)资助
【分类号】：TU528

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