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含湿量对混凝土导热系数的影响分析
Effect of Moisture Content on Thermal Conductivity of Concretes
投稿时间:2017-09-11  修订日期:2017-10-12
DOI:103969/j.issn.1007 9629201804011
中文关键词:  含湿量  混凝土  导热系数  试验
英文关键词:moisture content  concrete  thermal conductivity  experiment
基金项目:国家自然科学基金资助项目(51508443,51590911);国家重点研发计划资助项目(2016YFC0700400);陕西省自然科学基金资助项目(2016JQ5055)
              
作者单位
王莹莹
WANG Yingying
西安建筑科技大学环境与市政工程学院,陕西西安710055
School of Environmental and Municipal Engineering, Xian University of Architecture and Technology, Xian 710055, China
马超
MA Chao
中建科技集团有限公司,北京100070
China Construction Science and Technology Group Co., Ltd., Beijing 100070, China
刘艳峰
LIU Yanfeng
西安建筑科技大学环境与市政工程学院,陕西西安710055
School of Environmental and Municipal Engineering, Xian University of Architecture and Technology, Xian 710055, China
王登甲
WANG Dengjia
西安建筑科技大学环境与市政工程学院,陕西西安710055
School of Environmental and Municipal Engineering, Xian University of Architecture and Technology, Xian 710055, China
刘加平
LIU Jiaping
西安建筑科技大学环境与市政工程学院,陕西西安710055
School of Environmental and Municipal Engineering, Xian University of Architecture and Technology, Xian 710055, China
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中文摘要:
      掌握混凝土导热系数与含湿量的定量关系是准确计算混凝土传热传质性能及建筑能耗的前提.通过试验分析了含湿量对3种常见混凝土导热系数的影响,并给出了两者之间的定量关系.研究结果表明:混凝土孔隙率越大,含湿量对其导热系数的影响越明显;在低含湿量范围内,混凝土导热系数随含湿量增加而增加的幅度较大,而在高含湿量范围内其增幅变小,且孔隙率和孔径越大时,此变化趋势越明显;获得了混凝土导热系数与质量含湿量的幂函数关系.
英文摘要:
      Mastering the quantitative relationship between the thermal conductivity and the moisture content of concretes is the premise of accurate calculations of envelope heat and mass transfer and energy consumption of the concrete building. The influence of the moisture content on the thermal conductivity of three concretes and the quantitative relationship between them was obtained by experimental analysis. The results show that the effect of moisture content on concretes thermal conductivity will be more obvious with the larger porosity. The thermal conductivity of the moist concretes increases quickly in a low moisture content range and increases slowly in a high moisture content range. This trend is more obvious at larger concretes porosities and pore diameters. The thermal conductivity is related to the moisture content of concretes through an approximate power function.
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