| 摘要: |
| 用数值模拟建立了三维随机骨料模型，分析了不同粗骨料形状、含量、粒径以及多粒径组合粗骨料对混凝土氯离子扩散的影响，并结合快速氯离子迁移系数法进行了验证.结果表明：相同体积粗骨料的形状特征参数越小，氯离子扩散受到的阻碍作用越明显；在一定浓度范围内，氯离子扩散系数随着粗骨料含量的增加逐渐减小；当粗骨料体积分数确定时，氯离子扩散系数随着粗骨料粒径的增加而减小；在相同体积分数下，氯离子扩散系数随着多粒径组合粗骨料粒径数的增加而增加. |
| 关键词: 氯离子扩散 数值模拟 粗骨料 快速氯离子迁移系数法 |
| DOI：10.3969/j.issn.1007-9629.2023.04.007 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（U1905216） |
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| Simulation and Experiment of the Effect of Coarse Aggregate on Chloride Diffusion in Concrete |
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CAI Dongxing1, BI Wenyan2, GUAN Xuemao1
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1.School of Materials Science and Engineering， Henan Polytechnic University， Jiaozuo 454003， China;2.School of Chemistry and Chemical Engineering， Henan Polytechnic University， Jiaozuo 454003， China
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| Abstract: |
| A three-dimensional random aggregate model was established by numerical simulation to analyze the effects of different coarse aggregate shapes， contents， particle size and multiple particle size combinations on the chloride diffusion coefficient in concrete. The results were verified by the rapid chloride migration test. The results show that the smaller the shape parameter of the coarse aggregate in the same volume， the more signifacant the hindrance of chloride diffusion. Within a range of certain concentration， the chloride diffusion coefficient decreases gradually with increasing coarse aggregate content. The chloride diffusion coefficient decreases with the increasing of the coarse aggregate particle size for a certain volume fraction， and increases with the increasing of the number of particle sizes combined into coarse aggregates for the same volume fraction. |
| Key words: chloride diffusion numerical simulation coarse aggregate rapid chloride migration test |
