疲劳作用对混凝土中钢筋锈蚀氯离子临界浓度的影响  

Influence of Fatigue on Chloride Threshold Value of Steel Reinforcement Corrosion in Concrete

作　　者：王永亮[1] 蒋林华[1,2] 李炜[1] 刘浩[1] 何亮亮[1] 朱承龙[1] 

机构地区：[1]河海大学力学与材料学院,南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,南京210098

出　　处：《材料导报》2013年第24期125-128,共4页Materials Reports

基　　金：国家自然科学基金(51278167;51278168)

摘　　要：采用三分点加载模式,对钢筋混凝土短梁进行疲劳实验。将受到不同次数疲劳作用的钢筋置于饱和Ca(OH)2溶液中,采用阶梯逐级添加的方式加入NaCl,通过测得的自腐蚀电位Ecorr和电化学阻抗技术测得的腐蚀电流密度Icorr判定钢筋锈蚀的氯离子临界浓度。结果表明:疲劳作用对混凝土中钢筋锈蚀有一定的加速促进作用,使氯离子临界浓度降低,疲劳作用后的钢筋更易发生锈蚀;随疲劳作用次数的增加,钢筋锈蚀的可能性增大,锈蚀速率加快。The fatigue reinforced concrete beams was tested using three-point loading method. The steel suI fered different fatigue cycle times were put into the saturated Ca（OH）2 solution, and the NaC1 was poured in step by step. The chroride concentration was iudged through the open-circuit potential （Ecorr） and corrosion current （I~） which was tested by electrochemical impedance spectroscopy technology. The results showed that, the fatigue has a promotive effect on accelerating the corrosion of the steel, which decreased the chloride threshold value of steel rein- forcement corrosion. With the increasing of fatigue cycle times, the possibility and the speed of corrosion increased.

关 键 词：疲劳作用钢筋锈蚀氯离子临界浓度 电化学阻抗谱 

分 类 号：TU528[建筑科学—建筑技术科学]