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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.
The compressive fatigue test of Q235 steel bars was carried out by using the stress level of 0.8. Then, the steel bars subjected to different fatigue times were placed in saturated Ca (OH) 2 solution, and the NaCl solution was added step by step by adding the corrosion potential Ecorr The corrosion current Icorr measured by electrochemical impedance spectroscopy (EIS) was used to determine the critical chloride ion concentration (CTV) which caused corrosion of steel bar and the SEM micrographs were used to study the microstructural changes of the steel caused by fatigue. CTV showed the trend of first increase and then decrease within a certain stress level and the number of fatigue times; under the compression fatigue effect, there was no obvious regularity in the change of arc radius of reinforcement capacity under EIS, Increase the amount of monotonous decrease.