压缩疲劳作用对钢筋锈蚀临界氯离子浓度的影响

发布时间：2018-03-22 22:02

本文选题：压缩疲劳作用　切入点：钢筋锈蚀　出处：《建筑材料学报》2015年06期 　论文类型：期刊论文

【摘要】：采用0.8的应力水平对Q235钢筋进行压缩疲劳试验,然后将受到不同疲劳次数作用的钢筋置于饱和Ca(OH)2溶液中,采用阶梯逐级添加方式加入NaCl溶液,通过自腐蚀电位Ecorr和由电化学阻抗谱(EIS)所测得的腐蚀电流Icorr判定导致钢筋锈蚀的临界氯离子浓度(CTV),并利用扫描电子显微镜(SEM)研究疲劳作用引起的钢筋显微组织变化.结果表明:在一定的应力水平和疲劳次数范围内CTV呈现先增后减趋势;压缩疲劳作用下,EIS图谱中钢筋容抗弧半径的变化无明显规律,而未经压缩疲劳作用的钢筋容抗弧随Cl-添加量的增加而单调递减.
[Abstract]:The compressive fatigue test of Q235 steel bar was carried out at the stress level of 0.8, then the steel bar subjected to different fatigue times was placed in saturated Ca(OH)2 solution, and the NaCl solution was added step by step by step by step. The corrosion current (Icorr) measured by electrochemical impedance spectroscopy (EIS) and self-corrosion potential (Ecorr) were used to determine the critical concentration of chloride ions leading to the corrosion of steel bars. The microstructure of steel bars induced by fatigue was studied by scanning electron microscopy (SEM). The results show that CTV increases first and then decreases in a certain range of stress levels and fatigue times. Under compression fatigue, there is no obvious rule for the change of the arc radius of steel bar capacitive impedance in the EIS diagram, but the capacitance arc of the steel bar without compressive fatigue decreases monotonously with the increase of Cl-added content.
【作者单位】：河海大学力学与材料学院;江苏省水工新材料及防护工程技术研究中心;哈尔滨铁道职业技术学院铁道建筑系;
【基金】：国家自然科学基金资助项目(51278167;51278168) 江苏省自然科学基金资助项目(BK20131374)
【分类号】：TU375

【相似文献】