基于非球形颗粒水化堆积的水泥浆氯离子扩散系数预测
作者:
作者单位:

1.浙江农林大学 暨阳学院, 浙江 诸暨 311800;2.上海交通大学 海洋工程 国家实验室, 上海 200240

作者简介:

张 坚(1990—), 男, 浙江诸暨人, 浙江农林大学讲师, 博士. E-mail: jianzhang_zjyc@163.com

通讯作者:

刘清风(1986—), 男, 辽宁大连人, 上海交通大学教授, 博士生导师,博士. E-mail: liuqf@sjtu.edu.cn

中图分类号:

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)


Prediction for Chloride Diffusivity of Cement Paste Based on Accumulation of Hydrated Imperfect Spherical Particles
Author:
Affiliation:

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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    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.

    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.

    图1 椭球水泥颗粒的水化模型Fig.1 Hydration model of ellipsoidal cement particle
    图2 水泥浆微观结构重构Fig.2 Reconstruction of microstructure of cement paste
    图3 水化模型的验证Fig.3 Verification of hydration model
    图4 长细比对水化度的影响Fig.4 Influence of μ on αc(mW/mC=0.5)
    图6 长细比对孔隙率的影响Fig.6 Influence of μ on porosity
    图7 布朗粒子的运动形式Fig.7 Motion patterns of Brownian particles
    图8 Dcp与R、M的关系Fig.8 Relationship between Dcp and R,M
    图9 水泥立方单元和布朗粒子的运动路径Fig.9 Microstructure model of cement paste and motion path of Brownian particles
    图10 计算值与试验值的比较Fig.10 Comparison of numerical results and test data
    图11 长细比对氯离子扩散系数的影响Fig.11 Influence of μ on Dcp
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引用本文

张坚,刘清风.基于非球形颗粒水化堆积的水泥浆氯离子扩散系数预测[J].建筑材料学报,2023,26(9):955-962

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  • 收稿日期:2022-10-01
  • 最后修改日期:2022-11-28
  • 在线发布日期: 2023-10-10
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