| 摘要: |
| 为深入研究水泥浆体中氯离子的扩散性能，更好地考虑水泥颗粒形状特征带来的影响，建立了基于非球形颗粒水化堆积的水泥浆水化模型，通过第三方试验充分验证其可靠性后，明确了长细比对水化度和孔结构特征的影响；将First-passage理论应用于所建立的水泥浆水化模型，提出了综合考虑内、外水化层和未水化层扩散特性的布朗运动算法，并通过对比氯离子扩散试验数据对其可靠性进行了验证；利用建立的布朗运动算法分析了长细比对水泥浆氯离子扩散系数的影响.结果表明，本文建立的分析水泥颗粒形状对氯离子扩散系数影响的新方法，可为混凝土耐久性设计提供参考. |
| 关键词: 水泥浆 水泥颗粒形状 氯离子扩散系数 水化模型 布朗运动算法 |
| DOI：10.3969/j.issn.1007-9629.2023.09.002 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51978619）； 重庆市自然科学基金资助项目（cstc2021jcyj-msxmX1103） |
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| Prediction for Chloride Diffusivity of Cement Paste Based on Accumulation of Hydrated Imperfect Spherical Particles |
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ZHANG Jian1, LIU Qingfeng2
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1.Jiyang College， Zhejiang Agriculture and Forestry University， Zhuji 311800， China;2.State Key Laboratory of Ocean Engineering， Shanghai Jiao Tong University， Shanghai 200240， China
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| Abstract: |
| To further study the chloride diffusion performance of cement paste and better consider the influence of cement particle shape characteristic， a hydration model of cement paste with accumulation of hydrated imperfect spherical particles was established. After fully verifying its reliability through third-party experiments， the influence of aspect ratio on hydration degree and pore structure feature was clarified. By applying the First-passage theory to the hydration model of cement paste， a Brownian motion algorithm was proposed for the diffusion characteristics of inner and outer hydration layer and unhydrated layer of the hydrated cement particle involved. By comparing the data from chloride diffusion test， the reliability of this algorithm was demonstrated. The influence of the aspect ratio of ellipsoidal cement particles on chloride diffusivity of cement paste was analyzed using the established Brownian motion algorithm. The results indicate that the established new method for analyzing the shape effect of cement particle on chloride diffusivity can provide references for the durability design of concrete. |
| Key words: cement paste cement particle shape chloride diffusivity hydration model Brownian motion algorithm |
