东南大学学报（自然科学版）2012，Vol.42Issue(3)：492-497,6.DOI:10.3969/j.issn.1001-0505.2012.03.019
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
Evolution and distribution of corrosion pits in reinforcing bars under coupled chemo-mechanical attacks
摘要
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.关键词
化学-力学耦合/钢筋锈蚀/蚀坑演化/蚀坑分布Key words
chemo-mechanical coupling/ steel corrosion/ pitting evolution/ pitting distribution分类
建筑与水利引用本文复制引用
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):492-497,6.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). （973计划）
