干湿循环条件下钢筋锈蚀的临界氯离子浓度

Critical Chloride Concentration of Rebar Corrosion under Dry Wet Cycles

摘要:

采用电化学交流阻抗谱研究了干湿循环条件下混凝土中钢筋锈蚀的临界氯离子浓度，深入探讨了混凝土中钢筋锈蚀临界点的判断方法，分析了干湿循环时间比对临界氯离子浓度的影响.结果表明：借助电化学交流阻抗谱法能较为准确地判断钢筋锈蚀临界点；临界氯离子浓度随干湿循环时间比的增加基本呈增大趋势；临界氯离子浓度与干燥结束时混凝土的饱和度之间存在线性关系，且随着干燥结束时混凝土饱和度的增大而降低.

Abstract:

Electrochemical impedance spectroscopy was used to study critical chloride concentration of rebar corrosion in concrete under the condition of dry wet cycles. The method for estimating the critical state of rebar corrosion in concrete was discussed, and the effect of time ratio of drying to wetting on critical chloride concentration was analyzed. The results show that the critical corrosion state can be determined by electrochemical impedance spectroscopy. The critical chloride concentration tends to increase with the increase of time ratio of drying to wetting. The critical chloride concentration has a linear relationship with the saturability of concrete after drying, and decreases with the increase of saturability of concrete after drying.