混凝土氯离子扩散系数预测的格构模型  

A Lattice Model for Predicting the Chloride Diffusivity of Concrete

作　　者：郑建军[1] 梁云滢[1] 邵林[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014

出　　处：《建筑材料学报》2009年第6期716-719,共4页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50878196);浙江省自然科学基金资助项目(Y107638)

摘　　要：提出了混凝土氯离子扩散系数预测的格构模型;应用能量等效原理,导出了格构梁和连续体氯离子扩散系数之间的解析关系式.基于模拟所得的骨料分布和格构梁与骨料之间的相对位置,确定了每一个格构梁单元的刚度矩阵.通过有限单元分析,获得了混凝土氯离子扩散系数;定量评价了最大骨料直径、界面氯离子扩散系数和骨料级配对混凝土氯离子扩散系数的影响.基于数值结果,发现混凝土氯离子扩散系数随着最大骨料直径的增大而减小;随着界面氯离子扩散系数的增大而增大;骨料级配对混凝土氯离子扩散系数有较大影响.A lattice model was developed for predicting the chloride diffusivity of concrete. By applying the principle of energy equivalence, an analytical relationship of chloride diffusivity between the lattice beam and the continuum body was derived. Based on the simulated aggregate distribution and the relative positions between the lattice beams and the aggregates, the stiffness matrix of each lattice beam was determined. By finite element analysis, the chloride diffusivity of concrete was obtained. The effects of the maximum aggregate diameter, chloride diffusivity of interfacial transition zone（ITZ） and aggregate gradation were evaluated in a quantitative manner. Based on the numerical results, it is found that the chloride diffusivity of concrete decreases with the increase of the maximum aggregate diameter, but increases by increasing the ITZ chloride diffusivity. It is also found that the aggregate gradation has a larger influence on the chloride diffusivity of concrete.

关 键 词：混凝土 氯离子扩散系数 格构模型 有限单元法 

分 类 号：TU528.01[建筑科学—建筑技术科学]