Influence of Constant Current Accelerated Corrosion on the Bond Properties of Reinforced Concrete
Influence of Constant Current Accelerated Corrosion on the Bond Properties of Reinforced Concrete
复制标题
恒流加速腐蚀对钢筋混凝土粘结性能的影响
DOI：
10.20964/2019.05.36
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发表时间：
2019-04
影响因子：
1.5
通讯作者：
Qiao Guofu
中科院分区：
文献类型：
--
作者：
Sun Yang;Qiao Guofu
钢筋锈蚀是钢筋混凝土结构面临的最严重的耐久性问题之一。在实验室中，目前普遍采用加速腐蚀法对钢筋混凝土结构进行腐蚀。为了缩短试验时间，试验中往往采用高电流密度，而忽略了电流对钢筋混凝土结构力学性能的影响。采用恒电流加速腐蚀法对4组钢筋混凝土构件进行腐蚀试验，外加恒电流密度分别为200μA/cm、400μA/cm、600μA/cm和1000μA/cm。在加速腐蚀过程中，记录混凝土的裂缝宽度及其对应的通电时间。锈蚀后进行拉拔试验，得到锈蚀钢筋混凝土构件的粘结强度。实验结果表明，增加外加电流密度的大小的结果在一个显着增加的最大裂纹宽度。在粘结强度衰减模型中，随着外加电流的增加，临界腐蚀水平似乎降低，粘结强度随腐蚀水平急剧下降。
Reinforcement corrosion is one of the most serious durability problems faced by reinforced concrete (RC) structures. In the laboratory, current accelerated corrosion method is widely used to corrode RC structures. In order to reduce the experimental time, high current density always tends to be adopted in the experiments, but the effects of current on the mechanical properties of RC structures are neglected. In this study, four groups of RC members were corroded by current accelerated corrosion method, and the impressed constant current densities were 200μA/cm, 400μA/cm, 600μA/cm and 1000μA/cm respectively. The crack width of concrete and its corresponding power time were recorded in the accelerated corrosion process. After corrosion, the pull-out tests were performed to get the bond strengths of corroded RC members. The experimental results obtained indicate that increasing the magnitude of the impressed current density results in a significant increase in maximum crack width. In the attenuation model of bond strength, with the increase of impressed current, the critical corrosion level seems to decrease and the bond strength decreases sharply with the corrosion level.