结构工程师2012，Vol.28Issue(2)：39-45,7.
基于细观复合材料的混凝土导热系数模型
Theoretical Models of Effective Thermal Conductivity of Concrete Based on Composite Materials in Mesoscale
摘要
Abstract
Temperature field analysis is one of the key contents for the analysis of durability, temperature stress, damage of structures under fire and energy efficiency in concrete structures, and thermal conductivity is an important parameter to determine the time-dependent temperature field. Considering that the concrete can be treated as a kind of two-phase composite materials composed of cement mortar and coarse aggregate in the mesoscale, theoretical models for effective thermal conductivity of two-phase materials were compared and analyzed. The calculated thermal conductivities of concrete materials by using these models were compared with the experimental results. It was found that the results calculated by using the models ignoring interfacial thermal resistance are in good agreement with the experimental results of saturated concrete materials while the impact of interfacial thermal resistance must be considered for dry concrete materials. To improve the accuracy of theoretical models for thermal conductivity of concrete materials, the influence of shape and grading of coarse aggregates,interfacial thermal resistance between cement mortar and coarse aggregates, porosity, moisture content should be taken into account.关键词
混凝土/导热系数/复合材料/理论模型Key words
concrete/thermal conductivity/composite material/theoretical model引用本文复制引用
张伟平,邢益善,顾祥林..基于细观复合材料的混凝土导热系数模型[J].结构工程师,2012,28(2):39-45,7.基金项目
国家重点基础研究发展计划(973)项目(2009CB623204) （973）
