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.
The effective thermal conductivity of autoclaved aerated concrete with different porosities was measured using Hot Disk thermal constants analyzer, which is based on the transient plant source technique to investigate, the thermal insulation performance of autoclaved aerated concrete. Data analysis results show that this instrument has good repeatability and is suitable for the thermal conductivity testing of moist building materials. Results also indicated that the effective thermal conductivity of moist aerated concrete increases monotonously with moisture content rising, and an inflection point appears when the moisture fraction is 15%. When the moisture fraction equal 25%, the thermal conductivity of moist samples is nearly twice that of dry samples. When the moisture fraction is as high as 100%, the thermal conductivity is 4 times as that of dry samples. The thermal conductivity of aerated concrete decreased with porosity increasing under the same moisture content. The predictor formulas for the effective thermal conductivity of aerated concrete about porosity and moisture fraction was proposed.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2015年第6期1101-1107,共7页
Journal of Zhejiang University：Engineering Science
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)
关键词
加气混凝土
有效导热系数
含水率
孔隙率
瞬态平面热源法
aerated concrete
thermal conductivity
moisture content
porosity
transient plantsource technique
作者简介
姚晓莉（1989－），女，硕士生，从事建筑节能技术研究．E-mail：yhan23@sina．com
通信联系人：范利武，男，副教授．E-mail：liwufan@zju．edu．cn
