Effect of pore shape on the thermal conductivity of partially saturated cement-based porous composites
Effect of pore shape on the thermal conductivity of partially saturated cement-based porous composites
复制标题
孔形状对部分饱和水泥基多孔复合材料导热系数的影响
DOI：
10.1016/j.cemconcomp.2017.05.002
复制
发表时间：
2017-08-01
影响因子：
10.5
通讯作者：
Xu, Shilang
中科院分区：
文献类型：
--
作者：
Li, Hedong;Zeng, Qiang;Xu, Shilang
可持续发展对新型水泥基多孔保温复合材料提出了越来越高的要求，迫切需要弄清影响其热性能的关键因素。在这项研究中，我们集中在孔形状的影响，这是一个经常被忽视或忽略的因素，对复合材料的热导率。基于有效介质和平均场理论，建立了简单两相夹杂-基体体系的预测模型。该模型可以很容易地扩展到评估多相和多尺度复合材料的有效导热系数。广义模型包括均匀化方案和材料结构，包括形状和取向的夹杂物。结果表明，夹杂物的形状对复合材料的有效导热系数有很大的影响。利用所建立的模型对已有文献报道的开裂普通混凝土和部分饱和蒸压加气混凝土的导热系数进行了预测，并进行了深入的讨论。(C)2017爱思唯尔有限公司版权所有
Increasing demands of new cement-based porous composites for thermal insulation required by sustainable development are crying out for clarifying the key factors affecting their thermal properties. In this study, we focused on the effect of pore shape, a factor that was often slighted or ignored before, on the thermal conductivity of composite materials. We established a predicting model for a simple twophase inclusion-matrix system based on effective medium and mean-field theories. The model can be easily extended to assess the effective thermal conductivity of multi-phase and multi-scale composites. The generalized model involves both homogenization schemes and material structures including the shapes and orientations of inclusions. We showed that the shapes of inclusions affect the effective thermal conductivity of composites significantly. The established model were used to predict the thermal conductivities of cracked ordinary concrete and partially saturated autoclaved aerated concrete reported in the literature with in-depth discussion. (C) 2017 Elsevier Ltd. All rights reserved.