%0 Journal Article
%T 电场作用下混凝土中氯离子输运模型及仿真<br>Transportation Model and Simulation of Chloride in Concrete under Electric Field
%A 刘宗民
%A 赵昆璞
%A 毛继泽&lt
%A br&gt
%A LIU Zongmin
%A ZHAO Kunpu
%A MAO Jize
%J 西南交通大学学报
%D 2017
%R 10.3969/j.issn.0258-2724.2017.04.010
%X 为了研究处于氯盐、杂散电流耦合侵蚀环境的混凝土结构耐久性，对电场作用下氯离子在混凝土内部的输运规律进行研究.首先，根据Hamilton型变分原理，建立电场作用下混凝土内部氯离子的输运模型；其次，基于细观角度，建立混凝土内部孔隙水饱和度的定量计算公式，并同时考虑时变因素和孔隙水饱和度对氯离子输运的影响，对非饱和状态下氯离子的扩散系数予以修正；最后，通过comsol模拟氯离子在混凝土内部的输运过程，并对电场作用下氯离子的输运速率与仅有浓度梯度作用下氯离子自由扩散速率进行了比较分析.研究结果表明：应用电场作用下混凝土中的氯离子输运模型研究地下混凝土结构的耐久性及结构寿命预测问题是可行的；在10 V电场作用下，混凝土中的氯离子的输运效率相当于自由扩散状态下氯离子输运效率的769倍.<br>： For the study of the durability of concrete structures in the coupling environment of chlorine salt and stray current, transportation law of chloride in concrete under electric field was investigated. According to the Hamilton-type variational principle, a transportation model of chloride in concrete under electric field was established. Based on the view of mesoscopic, quantitative formula of water saturation of pore in concrete was established. Considering the effects of time factor and water saturation of pore on transportation, the diffusion coefficient of chloride under unsaturated state was corrected. The transportation process of chloride in concrete was simulated by comsol, And the transportation rate of chloride under electric field was compared with free diffusion rate under concentration gradient. It is a suitable way to study the durability and service life prediction of underground concrete structures by the chloride transportation model of concrete under electric field. In the influence of 10 V electric field, the transportation efficiency of chloride in concrete is equivalent to 769 times of the efficiency of chloride transportation under free diffusion
%K 电场
%K 氯离子的扩散系数
%K 输运模型
%K 孔隙水饱和度
%K &lt
%K br&gt
%K electric field
%K chloride diffusion coefficient
%K transportation model
%K water saturation of pore
%U http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12460.shtml