| 摘要: |
| 采用电化学加速锈蚀和人工环境模拟方法制备侵蚀环境下混凝土构件中锈蚀钢筋样本,阐述了钢筋均匀锈蚀和不均匀锈蚀的发展机理,建立了更为合理的钢筋锈蚀程度分类方法和更为准确的评估指标.通过锈蚀钢筋力学性能测试,研究蚀坑参数对锈蚀钢筋力学性能的影响,建立了钢筋力学性能退化模型.考虑工程维护管理和结构性能评估实际情况,针对锈蚀率在5%～20%,蚀坑形状不规则的Ⅱ级钢筋,建立了蚀坑形状特征参数模型,为准确预测侵蚀环境下考虑锈蚀的钢筋混凝土结构长期承载力奠定了基础. |
| 关键词: 侵蚀性环境 锈蚀机理 锈蚀程度 蚀坑 拉伸试验 蚀坑参数 |
| DOI：103969/jissn1007 9629201405009 |
| 分类号: |
| 基金项目:浙江省重点科技创新团队项目（2010R50034）；国家高技术研究发展计划（863计划）项目(2007AA04Z437)；国家自然科学基金资助项目（51378456）；浙江省自然科学基金资助项目（LZ13E080001）；高等学校博士学科点专项科研基金资助项目（200803351117） |
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| Experimental Investigation of Performance Degradation of Corroded Rebar Considering Pitting Feature |
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SUN Xiaoyan1, ZHU Jianke2, WANG Hailong1, ZHANG Zhicheng1
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1.College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China;2.Shaoxing Highway Management Office, Shaoxing 312300, China
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| Abstract: |
| Rebar corrosion test samples under aggressive environment were prepared through electrochemically accelerated corrosion method and dry wet cycles. The features of pitting corrosion were found out, and the mechanism of uniform corrosion and pitting corrosion was discussed. A classification and qualification methods for corroded rebar with more reasonability and higher accuracy were established. The effects of the pitting features on mechanical performance were investigated on basis of tensile test of corroded rebar, and the mechanical performance degradation model of corroded rebar was established. Considering maintenance management and structure assessment in the real project, a model of pitting corrosion for CINII rebar were developed with the corrosion rate between 5%20%, which can provide a reference to the long term capacity prediction of reinforced concrete structure under aggressive environment with corrosion considered. |
| Key words: erosion environment corrosion mechanism corrosion degree pit tensile test corrosion pit parameter |
