源溶液成分对氯离子在混凝土中电迁移特性的影响

Research on Influence of Source Solution on Chloride Migration in Concrete

氯离子在混凝土中的电迁移过程受离子间相互作用、双电层效应等因素的影响,扩散系数并非常量,而是溶液成分的函数。详细阐述了溶液成分影响氯离子在混凝土中扩散迁移特性的机理,并通过改进的RCM法测定了不同水灰比、龄期、外加电压和源溶液成分下的氯离子扩散系数。实验结果表明,较其它因素而言源溶液成分对电迁移特性影响较小,但总体仍呈一定规律。

Chloride diffusivity tested by migration method is not a constant but a function of solution composition due to the effect of ionic interaction, electrical double slayer, etc. The complicated influencing mechanism of solution composition on chloride diffusivity in concrete was introduced, chloride diffusion coefficients were tested by modi- fied RCM method under different conditions of w/c ratio, age, external voltage and source solution. An analysis of test result is presented that the influence of source solution on chloride migration follows a certain discipline although it is less obvious than other factors.