| 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. |
| 关键词: 水泥基材料 固碳 孔径分布 渗透速率 |
| DOI：10.3969/j.issn.1007-9629.2024.10.002 |
| 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） |
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| Numerical Study on Effect of Carbonation on Pore Size Distribution and Permeability of Cementitious Materials |
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TONG Liangyu1, LIU Qingfeng1,2
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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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| 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. |
| Key words: cementitious material carbon sequestration pore size distribution permeability |
