摘要
分析了骨料分形系数对混凝土水渗透性的影响。应用有限差分法求解二维不可压缩黏性流动纳维尔-斯托克斯方程,通过计算平均速度和压力差计算混凝土水渗透系数。通过与理论解比较,验证了该文数值方法的有效性。基于数值结果,发现对于给定的骨料面积百分数,双骨料混凝土水渗透系数小于单骨料混凝土水渗透系数,当骨料分形系数从0.01增大到0.3时,双骨料混凝土水渗透系数随着分形系数的增大而减小,当骨料分形系数大于0.3时,双骨料混凝土水渗透系数基本趋向定值。
The effect of the aggregate fractal coefficient on the water permeability of concrete is analyzed. The Navi- er-Stokes equations of two-dimensional incompressible viscous flow are solved by the finite difference method. The wa- ter permeability of concrete is obtained by calculating the average speed and fluid pressure difference. The validity of the numerical method is verified with the theoretical solution. Based on the numerical results, it is found that, for a given aggregate area fraction, the water permeability of double-aggregate concrete is smaller than that of single-aggre- gate concrete. When the aggregate fractal coefficient varies from 0. 01 to 0. 3, the water permeability of double-aggre- gate concrete decreases with the increase of the aggregate fractal coefficient. When the aggregate fractal coefficient is larger than 0. 3, the water permeability of double-aggregate concrete approaches to a fixed value.
出处
《建材世界》
2012年第3期16-19,共4页
The World of Building Materials
基金
国家自然科学基金资助项目(50878196)
关键词
混凝土
水渗透系数
骨料分形系数
有限差分法
concrete water permeability
aggregate fractal coefficient
finite difference method
