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针对兰州地铁建设中地下水SO2-4和Cl-含量较高的问题,基于钢筋混凝土结构中的钢筋腐蚀,通过设计2种模拟液和3种混凝土配合比,选择合适的混凝土配合比,采用CS350电化学工作站,对混凝土中钢筋的电化学腐蚀行为进行研究.结果表明:通过腐蚀电流密度与钢筋锈蚀程度的对应关系,只有浸泡溶液NaCl浓度为20g/L、MgSO4浓度为5g/L中第二种配合比混凝土中钢筋未产生腐蚀,其他5种钢筋均出现了不同程度的低腐蚀现象.通过2种模拟液不同配合比混凝土中钢筋的腐蚀速率对比分析,除了其中一组,其他几组均为混凝土水灰比越小,混凝土中钢筋的腐蚀速率越小;选择第二种混凝土配合比为较优混凝土配合比.
Aiming at the high groundwater SO2-4 and Cl- content in Lanzhou Metro construction, based on the reinforcement corrosion in reinforced concrete structure, two types of simulation liquid and three kinds of concrete mix ratio were designed, the suitable mix proportion of concrete was selected, and CS350 Chemical workstation was used to study the electrochemical corrosion behavior of steel bars in concrete.The results showed that only the concentration of NaCl in soaking solution was 20g / L and the concentration of MgSO4 was 5g / L in the second The other five kinds of steel bars showed different degrees of low corrosion.Comparing the corrosion rate of the steel bars in the two kinds of concrete with different proportions of concrete, except for one group, the other groups were The smaller the water-cement ratio, the smaller the corrosion rate of steel in concrete. The second type of concrete mix is the better concrete mix ratio.