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| 化学-力学耦合作用下混凝土内钢筋蚀坑的演化及分布规律 | |
| 引用本文： | 徐亦冬,钱春香,孙家瑛.化学-力学耦合作用下混凝土内钢筋蚀坑的演化及分布规律[J].东南大学学报(自然科学版),2012,42(3):492-497. |
| 作者姓名： | 徐亦冬 钱春香 孙家瑛 |
| 作者单位： | 1. 东南大学材料科学与工程学院,南京211189;浙江大学宁波理工学院绿色建材与废弃物资源化研究中心,宁波315100 2. 东南大学材料科学与工程学院,南京211189;东南大学江苏省土木工程材料重点实验室,南京211189 3. 浙江大学宁波理工学院绿色建材与废弃物资源化研究中心,宁波,315100 |
| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目(2009CB623203);国家自然科学基金资助项目(51008276) |
| 摘 要： | 基于概率与统计知识,对化学-力学耦合作用下钢筋蚀坑的演化及其分布进行研究.结果表明氯盐侵蚀下钢筋蚀坑的演化可分为3个阶段:微观非稳态点蚀形核、细观亚稳态蚀坑、宏观稳态蚀坑.单一氯盐腐蚀作用下形成的宏观稳态蚀坑深度相对较小,而拉应力的引入将加剧钢筋表面化学/物理性质的不均匀,从而导致宏观稳态蚀坑深度较大.在氯盐及其与拉应... |
| 关 键 词： | 化学-力学耦合 钢筋锈蚀 蚀坑演化 蚀坑分布 |
Evolution and distribution of corrosion pits in reinforcing bars under coupled chemo-mechanical attacks |
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| Xu Yidong , Qian Chunxiang , Sun Jiaying.Evolution and distribution of corrosion pits in reinforcing bars under coupled chemo-mechanical attacks[J].Journal of Southeast University(Natural Science Edition),2012,42(3):492-497. | |
| Authors: | Xu Yidong Qian Chunxiang Sun Jiaying |
| Institution: | 1School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)(2Research Center of Green Building Materials and Waste Resources Reuse,Ningbo Institute of Technology,Zhejiang University, Ningbo 315100,China)(3Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China) |
| Abstract: | Based on the probability theory and mathematical statistics,the evolution and distribution of corrosion pits in reinforcing bars under coupled chemo-mechanical attacks are studied.The results show that the evolution of corrosion pits involves three stages: unsteady pitting nucleation in micro-scale,metastable pitting in meso-scale,and steady-state pitting in macro-scale.Under chloride attack,the corrosion pit depth in macro-scales is relatively small.While under the coupled chemo-mechanical effect,the chemical/physical properties of steel surface become uneven,which leads to larger corrosion pit depth.The pitting depth in reinforcing bars conforms to the Weibull distribution preferentially under either chloride or simultaneous tensile stress and chloride attacks.Under certain corrosion environment,the linear regression model fits the relationship between scale parameter and corrosion rate.However,there is no significant relationship between shape parameter and corrosion rate.A predicting model based on the Weibull distribution is established,and the predicted values and the observed ones are in good accordance. |
| Keywords: | chemo-mechanical coupling steel corrosion pitting evolution pitting distribution |
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