| 摘要: |
| 基于固相分形模型和格子Boltzmann方法，通过数值模拟手段研究非饱和硬化水泥浆的氯离子扩散性能.首先应用固相分形模型来模拟硬化水泥浆的多孔结构，在此基础上采用格子Boltzmann方法模拟相应的氯离子扩散.在固相分形模型中，按照孔隙尺寸分布对硬化水泥浆多孔结构进行逐级饱和来实现饱和度的变化.对比当前数值模拟的结果与经典幂函数型饱和函数的预测结果，发现二者吻合较好，饱和系数的合理取值为4～5. |
| 关键词: 饱和度 饱和函数 固相分形模型 格子Boltzmann方法 氯离子扩散 |
| DOI：10.3969/j.issn.1007 9629.2016.06.018 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）项目（2015CB655105）；中央高校基本科研业务费专项资金资助项目；江苏省土木工程材料重点实验室开放基金（CM2015 02） |
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| Numerical Simulation of Chloride Diffusivity in Non saturated Hardened Cement Paste |
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GAO Yun1, JIANG Jinyang1, WU Kai2
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1.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;2.School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
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| Abstract: |
| Numerical simulation was performed on chloride diffusivity in non saturated hardened cement paste, in which saturation function was related to saturation degree. In particular, the solid mass fractal model was applied to simulate pore structure of hardened cement paste. Meanwhile, the lattice Boltzmann method was applied to simulate chloride diffusion. The variation of saturation degree was addressed in terms of the successive filling of pores with respect to pore size distribution. The present numerical results agreed well with the results calculated from classical power type saturation function, and the saturation coefficient should be of 45. |
| Key words: saturation degree saturation function solid mass fractal model lattice Boltzmann method chloride diffusion |
