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采用氯离子浸泡、加载杂散电流及显色法研究了杂散电流存在情况下氯离子在混凝土内部的迁移过程以及粉煤灰对该过程的影响。结果表明,当加载杂散电流后,氯离子会加速向混凝土侵入,其扩散深度平均值为自然扩散条件下的7～8倍,同时,氯离子在混凝土内部呈近似一条抛物线分布,并在垂直钢筋的方向上氯离子侵入的深度最大。粉煤灰的引入可以明显改善杂散电流存在情况下混凝土抗氯离子渗透性能,而且,在一定掺量范围内,随着粉煤灰掺量的增加,其改善效果越为明显。
Chloride ion immersion, loading stray current and colorimetric method were used to study the migration process of chloride ions in concrete and the influence of fly ash on the process in the presence of stray current. The results show that when stray current is applied, chloride ion accelerates into concrete, and the average depth of diffusion is 7 ~ 8 times that of natural diffusion. At the same time, the chloride ion has a nearly parabola distribution in concrete, In the direction of the largest chloride intrusion depth of the largest. The introduction of fly ash can obviously improve the chloride ion resistance of concrete in the presence of stray current. Moreover, the improvement effect is more obvious with the increase of fly ash content within a certain dosage range.