| 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. |
| 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 |
| DOI：10.3969/j.issn.1007-9629.2023.05.003 |
| 分类号:TV41 |
| 基金项目: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） |
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| Calculation Model of Thermal Conductivity of Concrete in Cold Regions Considering Pore-Solution Phase Transformation |
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GONG Jingwei1,2, CHEN Peng1,2, CAO Guoju1,2, CHEN Rui1,2, HE Chuanqing3
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1.College of Hydraulic and Civil Engineering， Xinjiang Agricultural University， Urumqi 830052， China;2.Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention， Xinjiang Agricultural University， Urumqi 830052， China;3.Xinjiang Institute of Water Resources and Hydropower Research， Urumqi 830049， China
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| Abstract: |
| 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. |
| Key words: thermal conductivity of concrete equal law of specific equivalent heat conduction temperature change saturation pore distribution |
