混凝土中钢筋脱钝的临界氯离子浓度研究
PDF下载 (266)姚森元,闫加利,柳俊哲*,耿俊迪.混凝土中钢筋脱钝的临界氯离子浓度研究[J].宁波大学学报(理工版),2018,31(3):83-88.DOI:
YAO Sen-yuan,YAN Jia-li,LIU Jun-zhe*,GENG Jun-di.Critical chloride ion concentration of dispassivate reinforcing steel bar in concrete[J].Journal of Ningbo University(Natural Science & Engineering Edition),2018,31(3):83-88.DOI:
| Title: | Critical chloride ion concentration of dispassivate reinforcing steel bar in concrete |
| 作者: | 姚森元, 闫加利, 柳俊哲*, 耿俊迪 |
| Author(s): | YAO Sen-yuan, YAN Jia-li, LIU Jun-zhe*, GENG Jun-di |
| 关键词: | 钢筋混凝土; 氯离子; 钝化膜; 钢筋腐蚀 |
| Keywords: | reinforced concrete; chloride; passive film; steel corrosion |
| 分类号: | TU528.0 |
| 文献标识码: | A |
| 摘要: | 通过不同氯盐钢筋混凝土加速腐蚀试验, 结合、腐蚀面积率和失重率混凝土保护层厚度、水灰比对混凝土中钢筋脱钝的临界氯离子浓度的影响. 结果表明: 为0.5时保护层厚度为15mm钢筋对应氯离子浓度为0.1保护层厚度25mm的则为0.2水灰比0.3时, 保护层厚度15mm钢筋对应氯离子浓度为0.5保护层厚度25mm的则为0.6表面自带灰黑色能有效延缓钢筋锈蚀当同时处于0.5水灰比, 15mm保护层厚度未去氧化皮的钢筋对应氯离子浓度为0.4%. |
| Abstract: | In accelerated steel corrosion test of reinforced concrete with different chloride gradients, the influences of concrete cover thickness, water cement ratio and oxide scale on critical chloride concentration to the rebar depassivation are investigated in combination with half-cell potentials, corroded area and mass loss. The results indicate that critical chloride concentration of rebar depassivation is positively correlated with thickness of concrete cover and negatively correlated with water cement ratio. When water cement ratio is 0.5, the critical chloride concentration of rebar in 15mm concrete cover is found to be 0.1%, meanwhile in 25mm cover it turns out to be 0.2%. The critical chloride concentration is 0.5% and 0.6% for 15mm and 25mm concrete cover respectively when water cement ratio takes value of 0.3. The oxide scale on rebar surface can effectively delay the corrosion. When water cement ratio is 0.5 and concrete cover is 15mm, the critical chloride concentration of rebar with oxide scale is 0.4%. |
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| 备注/Memo: | 收稿日期: 2017?08?02. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（51478227, 51778302）; 宁波大学研究生科研创新基金（G17097）. 第一作者: 姚森元（1992－）, 男, 浙江余姚人, 在读硕士研究生, 主要研究方向: 混凝土耐久性. E-mail: yjdtiancai1@hotmail.com *通信作者: 柳俊哲（1964－）, 男, 黑龙江五常人, 博导/教授, 主要研究方向: 混凝土耐久性. E-mail: junzheliu@163.com 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
