不同孔隙率下含湿加气混凝土的有效导热系数

发布时间：2018-06-20 16:39

本文选题：加气混凝土 + 有效导热系数　；参考：《浙江大学学报(工学版)》2015年06期

【摘要】：为研究含湿蒸压加气混凝土的保温性能,采用基于瞬态平面热源法的Hot Disk热常数分析仪测量不同孔隙率下含湿蒸压加气混凝土的有效导热系数.分析结果表明:Hot Disk热常数分析仪的测量结果具有较好的重复性,适用于含湿建筑材料导热性能的测试.含湿加气混凝土的有效导热系数随含水率的提高呈现单调增长的趋势,其增长曲线在质量含水率为15%时出现明显的拐点.当质量含水率约为25%时,含湿加气有效导热系数较干燥试样增大了近一倍;而当质量含水率高达100%时,混凝土的有效导热系数约为干燥试样的4倍.在相同含水率下,加气混凝土的有效导热系数随孔隙率的增大而逐渐降低.根据测量数据,总结得到加气混凝土有效导热系数关于孔隙率和质量含水率的预测公式.
[Abstract]:In order to study the thermal insulation performance of wet autoclaved aerated concrete, hot disk thermal constant analyzer based on transient plane heat source method was used to measure the effective thermal conductivity of wet autoclaved aerated concrete with different porosity. The results show that the measurement results of the hot disk thermal constant analyzer are reproducible and can be used to test the thermal conductivity of building materials containing moisture. The effective thermal conductivity of humidified aerated concrete increases monotonously with the increase of moisture content, and the growth curve has obvious inflection point when the mass moisture content is 15. When the mass moisture content is about 25, the effective thermal conductivity of wet aeration is nearly twice as much as that of the dry sample, while when the mass moisture content is up to 100, the effective thermal conductivity of concrete is about 4 times that of the dry sample. Under the same water content, the effective thermal conductivity of aerated concrete decreases with the increase of porosity. Based on the measured data, the prediction formulas of effective thermal conductivity of aerated concrete on porosity and mass moisture content are obtained.
【作者单位】：浙江大学热工与动力系统研究所;中国计量学院计量测试工程学院;浙江大学建筑技术研究所;
【基金】：国家自然科学基金资助项目(51378482) 中低温热能高效利用教育部重点实验室(天津大学)开放课题(201301302)
【分类号】：TU528

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