氯离子侵蚀作用下预应力混凝土结构中钢绞线表面氯离子浓度的模型研究

【作者】 罗小勇； 黄素辉；

【机构】 中南大学土木建筑学院；

【摘要】 目前,国内外对氯离子侵蚀做了大量的试验研究工作,一般说来,Cl~-扩散符合 Fick 第二定律,Cl~- 在混凝土中的积聚量沿深度方向呈双曲线分布,但是目前国内外对氯离子侵蚀的理论分析和试验研究,主要是在单因素侵蚀、无应力状态下进行的,与混凝土结构的实际工作环境不吻合。为此,本文通过对不同应力状态下的混凝土试件进行快速氯离子侵蚀试验结果分析,提出不同应力状态下混凝土中氯离子含量随时间和深度变化的数学模型,从而进一步提出预应力混凝土结构中钢绞线表面氯离子浓度的随机模型,并用实测数据验证模型的准确性,为深入研究氯盐对钢筋的腐蚀奠定了坚实的基础。更多还原

【Abstract】 At present,chloride ion erosion is studied by a lot of experiment,generally speaking, chloride ion diffusion is calculated based on the second Fick’s law,the amount of accumulative chloride ion accords with hyperbolic curve in depth in concrete.But at present theoretical analysis and experimental research caused by chloride ion eroding at home and abroad,are launched at the premise of single factor and non stress state,it does not accord with actual working environment of concrete structure.Therefore,by analying the data of fast chloride ion erosion experiment under different stress state,mathematical model of chloride ion content is advanced varying with time and depth under different stress states,and random model of chloride ion concentration surface of steel strand on prestressed concrete structures is further put forward,and the real data of experiment are taken to validate this model.更多还原