考虑孔溶液相变的寒区混凝土导热系数计算模型  

Calculation Model of Thermal Conductivity of Concrete in Cold Regions Considering Pore-Solution Phase Transformation

作　　者：宫经伟[1,2] 陈鹏 曹国举[1,2] 陈瑞 贺传卿 GONG Jingwei;CHEN Peng;CAO Guoju;CHEN Rui;HE Chuanqing(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Institute of Water Resources and Hydropower Research,Urumqi 830049,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]新疆农业大学新疆水利工程安全与水灾害防治重点实验室,新疆乌鲁木齐830052 [3]新疆水利水电科学研究院,新疆乌鲁木齐830049

出　　处：《建筑材料学报》2023年第5期465-474,共10页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51869031,51641906,51541909);新疆维吾尔自治区高校科研计划自然科学青年项目(XJEDU2020Y020);天山青年计划项目(2020Q017)。

摘　　要：将寒区混凝土视为多相复合材料,基于比等效导热相等法则建立了能够动态表征饱和度、温度及孔隙分布对混凝土导热系数影响的计算模型,并且将模型计算值与实测值进行了对比分析.结果表明,计算模型有效刻画了正负温交替条件下混凝土孔溶液的相变特征,客观揭示了寒区温度变化过程中混凝土导热系数的演化机理.The concrete in cold regions was considered as a multiphase composite material,and a calculation model that can dynamically characterize the effects of saturation,temperature and pore distribution on the thermal conductivity of concrete was established based on the law of equivalent thermal conductivity.The calculated values of the model and the measured values were compared and analyzed.The results show that the calculation model effectively portrays the phase change characteristics of the pore solution in concrete under the conditions of alternating positive and negative temperatures,and objectively reveals the evolution mechanism of the thermal conductivity of concrete in the process of temperature change in cold regions.

关 键 词：混凝土导热系数 比等效导热相等法则 温变 饱和度 孔隙分布 

分 类 号：TV41[水利工程—水工结构工程]