| 摘要: |
| 为了研究不同密度泡沫混凝土的孔隙结构特征及其导热性能差异，使用X射线计算机断层成像技术（X-CT）对4种密度的泡沫混凝土试样进行扫描，实现了泡沫混凝土孔隙结构的三维重建.基于试样的孔隙特征及分布，利用Matlab软件随机生成代码建立了4种密度的泡沫混凝土模型，并在Comsol有限元软件中对其稳态传热进行了仿真模拟.结果表明：泡沫混凝土内部的孔径分布近似服从对数正态分布，随着密度的增大，试样的孔隙率和孔径随之减小，孔隙形状逐渐趋于球状；泡沫混凝土内部传热主要在水泥基体中进行，少部分热流会穿过小尺寸孔隙，而大尺寸孔隙增大了热流的传导路径，对泡沫混凝土的导热性能影响较大. |
| 关键词: 泡沫混凝土 X射线计算机断层成像技术（X-CT） 孔隙特征 Comsol有限元软件 稳态传热 |
| DOI：10.3969/j.issn.1007-9629.2023.07.004 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金面上项目（52079049）；国家自然科学基金重点项目（51739003）；国家重点实验室基本科研业务费（522012272） |
|
| Pore Structure and Thermal Conductivity of Foam Concrete Based on X-CT |
|
GAO Zhihan1,2, CHEN Bo1,2, CHEN Jialin1,2, YUAN Zhiying1,2
|
|
1.College of Water-Conservancy and Hydropower， Hohai University， Nanjing 210098， China;2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering， Hohai University， Nanjing 210098， China
|
| Abstract: |
| In order to study the difference of pore structure and thermal conductivity of foam concrete with different densities， X-ray computer tomography（X-CT） was used to scan foam concrete samples of four densities， and the three-dimensional reconstruction of pore structure of foam concrete was realized. Based on the pore characteristics and distribution of the sample， the foam concrete models of four densities were established by using the randomly generated code of Matlab， and the steady-state heat transfer was simulated in Comsol finite element software. The results show that the pore size distribution of foam concrete approximately obeys lognormal distribution. The porosity and pore diameter decrease with the increase of density， and the pore shape tends to be spherical. The internal heat transfer of foam concrete is mainly carried out in the cement matrix. A small part of the heatflow will pass through small pores， while large pores increase the conduction path of heat flow， which has a great influence on the thermal conductivity of foam concrete. |
| Key words: foam concrete X-ray computer tomography（X-CT） pore characteristic Comsol finite element software steady-state heat transfer |
