基于混凝土真实三维模型的氯离子传输细观数值模拟

基于混凝土剖面序列图像重建真实三维模型的方法，将MIMICS、SOLIDWORK和COMSOL结合使用，研究混凝土细观结构对氯离子扩散影响。结果表明：模拟值与试验值能够相吻合，验证了真实三维模型的有效性；骨料的长径比越大，骨料的曲折效应越明显，对氯离子渗透的影响越显著；骨料的分布位置对氯离子扩散几乎没有影响；骨料越粗糙，对氯离子的阻滞效应越明显。界面过渡区（ITZ）厚度、扩散系数越大，对氯离子扩散影响越大。将真实三维模型与随机骨料模型模拟结果对比发现：随机骨料模型模拟数值总是小于真实三维模型数值。

Numerical simulation of chloride ion transport in fine scale based on realistic 3D model of concrete

By establishment method of real 3D model of concrete section sequence images, effects of concrete mesostructure on chloride diffusion are simulated by combination of MIMICS, SOLIDWORK and COMSOL. Results show that simulation results can match with the experimental results, verifying the validity of the real 3D model. The larger the aspect ratio of aggregate, the more obvious the tortuous effect of aggregate and the more significant the influence of aggregate on chloride ion penetration. The distribution of aggregate has almost no effect on chloride ion diffusion. The rougher the aggregate, the more obvious the blocking effect on chloride ions. As increasing of thickness and diffusion coefficient of ITZ, influence on chloride diffusion is greater. The comparison between the real 3D model and the random aggregate model shows that simulated value of random aggregate model is always smaller than that of real 3D model.