Electrodeposition is an emerging and unique method for the repair of concrete cracks, in particular, with great potential for the repair of aged asymmetric subsurface structures. However, the effect of groundwater solutions on the effectiveness of concrete repair by electrodeposition is not clear. Using an asymmetric electrodeposition repair device, this paper investigates the effect of simulated groundwater solutions with different to concentration ratios on the effectiveness of electric field-induced ettringite for repairing concrete cracks. Results show that the simulated groundwater solution has a negligible effect on the macroscopic repair effect on the electrolyte solution side, but allows a certain amount of () and precipitation to be generated on the simulated solution side. Meanwhile, compared with the deionized water group, the permeability coefficient is reduced from 2.05×10 cm/s to less than 7.65×10 cm/s at the repair age of 14 days. The total impedance is enhanced from 1322 KΩ to more than 1658 KΩ, with the lower the to concentration ratios, the lower the permeability coefficient and the higher the total impedance. Microstructure analysis suggests that as the concentration ratio of to decreases, the content of loose porous () decreases and the content of dense increases on the simulated solution side. Moreover, the size of the () particles on the simulated solution side, becomes larger and the amount of production decreases while the increases and changes from aragonite to calcite type.

中文翻译：

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不同Ca2+与Mg2+浓度比的模拟地下水溶液对混凝土不对称电沉积的影响

电沉积是一种新兴且独特的混凝土裂缝修复方法，特别是在修复老化的不对称地下结构方面具有巨大潜力。然而，地下水溶液对电沉积混凝土修复效果的影响尚不清楚。采用非对称电沉积修复装置，研究了不同浓度比的模拟地下水溶液对电场诱导钙矾石修复混凝土裂缝效果的影响。结果表明，模拟地下水溶液对电解质溶液侧宏观修复效果的影响可以忽略不计，但允许模拟溶液侧产生一定量的()和沉淀。同时，与去离子水组相比，修复龄期14 d时，渗透系数由2.05×10 cm/s降至7.65×10 cm/s以下。总阻抗由1322KΩ提高到1658KΩ以上，浓度比越低，导磁系数越低，总阻抗越高。微观结构分析表明，随着 t 浓度比的减小，模拟溶液侧松散孔隙 ( ) 的含量减少，致密孔隙的含量增加。而且，模拟溶液侧的()颗粒尺寸变大，产量减少，而增加，从文石型变为方解石型。