碳化对水泥基材料孔径分布及渗透速率影响的数值研究
作者:
作者单位:

1.上海交通大学 海洋工程国家重点实验室,上海 200240;2.华南理工大学 亚热带建筑与城市科学全国重点实验室,广东 广州 510640

作者简介:

童良玉(1999—), 女, 安徽六安人, 上海交通大学博士生. E-mail: tongly3@sjtu.edu.cn

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:

国家优秀青年科学基金资助项目(52222805); 上海市自然科学基金资助项目(22ZR1431400); 亚热带建筑与城市科学全国重点实验室开放基金资助项目(2023KA03)


Numerical Study on Effect of Carbonation on Pore Size Distribution and Permeability of Cementitious Materials
Author:
Affiliation:

1.School of Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.State Key Laboratory of Subtropical Building and Urban Science, South China University of Technology, Guangzhou 510640, China

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    摘要:

    研究了水泥基材料碳化沉积物在孔隙结构的填充位置,分析了碳化对孔径分布及渗透速率的影响,同时基于复合概率孔径分布构建了碳化后水泥基材料非线性孔径分布转化模型和渗透速率预测模型,并通过试验数据对模型进行了验证.结果表明:在综合考虑碳化后孔隙率和孔径分布变化的情况下,渗透速率的预测精度可得到提升;碳化时孔饱和度的变化可改变碳化沉积物在孔隙结构中的填充位置,进而导致碳化后孔径分布和渗透速率的差异;相较于单一孔隙密实过程,迭代密实过程中水泥基材料渗透速率的下降率有所减缓.

    Abstract:

    Filling position of carbonized sediments in the pore structure of cementitious materials was investigated. The effect of the carbonation on pore size distribution and permeation rate was analyzed. Additionally, based on the composite probability pore size distribution, nonlinear pore size distribution transformation models and permeation rate prediction models for cementitious materials after carbonation were constructed. These models were then confirmed using experimental data. The results indicate that the prediction accuracy of water permeation rate can be improved in consideration of the changes in porosity and pore size distribution after carbonation. The change in pore saturation during carbonation alters the filling position of carbonized sediments within the pore structure, leading to differences in pore size distribution and permeation rate after carbonation. Compared to the single pore compaction process, the rate of decrease in cementitious materials permeation rate is slower during the iterative compaction process.

    图1 复合概率孔径分布Fig.1 Multi-modal lognormal pore size distribution
    图2 水泥基材料非饱和孔隙结构示意图Fig.2 Schematic of unsaturated pore structure of cementitious materials
    图3 碳化后孔隙结构转化示意图Fig.3 Schematic of transformed pore structure after carbonation
    图4 试件M45孔径分布的试验数据与选取不同转化修正系数后的预测结果对比Fig.4 Comparison of measured data and predicted results of pore size distribution of specimen M45 with different correction factors
    图5 水泥基材料孔径分布的试验数据与预测结果对比Fig.5 Comparison of measured data and predicted results of pore size distribution of cementitious materials
    图6 碳化前后水泥基材料固有渗透速率的试验数据与预测结果对比Fig.6 Comparison of measured data and predicted results of intrinsic permeability of cementitious materials before and after carbonation
    图7 不同饱和度下孔隙率变化相同时水泥基材料孔径分布的变化Fig.7 Changes in pore size distribution of cementitious materials at different saturation with the same porosity reduction
    图8 水泥基材料固有渗透速率预测值Fig.8 Predicted intrinsic permeability of cementitious materials
    图9 不同孔隙率变化下饱和度相同时水泥基材料的孔径分布转化Fig.9 Transformation of pore size distribution of cementitious materials at the same saturation under different porosity reductions
    图10 不同转化方式下水泥基材料固有渗透速率预测值Fig.10 Predicted intrinsic permeability of cementitious materials corresponding to different transformed methods
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童良玉,刘清风.碳化对水泥基材料孔径分布及渗透速率影响的数值研究[J].建筑材料学报,2024,27(10):879-886

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  • 收稿日期:2024-04-09
  • 最后修改日期:2024-04-29
  • 在线发布日期: 2024-11-08
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