水利学报2017，Vol.48Issue(7)：765-772,8.DOI:10.13243/j.cnki.slxb.20170040
基于多相复合材料的混凝土导热系数预测模型
Prediction model for the thermal conductivity of concrete based on its composite structure
摘要
Abstract
Temperature field analysis is one of the most important criteria for predicting the durability and service life of concrete structures,and thermal conductivity is commonly regarded as an important parameter to determine the time-dependent temperature field.With consideration of the non-homogeneous characteristic of the material composition,a mesoscale approach,in which concrete is described as a three-phase composite consisting of the coarse aggregate,hardened cement mortar matrix and the interfacial transition zone (ITZ) between them,is adopted to develop the thermal conductivity of the mortar and ITZ components with in concrete in terms of the composite model.Compared with the experimental results existed in the literature,effect of various factors,such as the water-cement ratio,volume fraction of aggregate,sand ratio,saturation degree and the interfacial thermal resistance,on the thermal conductivity was discussed.The results show that thermal conductivity of concrete increases with an increase of saturation and aggregate volume fraction,but decreases with the increase of water-cement ratio.The influence of water saturation degree on thermal conductivity is well presented by means of the proposed model taking into account the interfacial thermal resistance.关键词
混凝土/复合材料/细观层次/导热系数/饱和度Key words
concrete/composite materials/mesoscale/thermal conductivity/saturation degree分类
建筑与水利引用本文复制引用
王立成,常泽,鲍玖文..基于多相复合材料的混凝土导热系数预测模型[J].水利学报,2017,48(7):765-772,8.基金项目
国家自然科学基金面上项目(51378090) （51378090）
国家重点基础研究发展计划项目(2015CB057703) （2015CB057703）
高性能土木工程材料国家重点实验室开放基金项目(2016CEM007) （2016CEM007）
