含水量和孔结构对多孔建筑陶瓷砖导热系数影响的试验研究  

Experimental study on influence of moisture content and pore structure on thermal conductivity of porous building ceramic tiles

作　　者：徐婉婷 XU Wan-ting

机构地区：[1]北方工业大学建筑与艺术学院,北京100043

出　　处：《砖瓦》2024年第2期25-28,共4页Brick-tile

摘　　要：多孔建筑陶瓷砖是一种多相复合材料,其导热性受温湿度和孔隙率等多个因素的综合影响。通过试验研究了不同孔结构、孔隙率和含水量等因素变化条件下多孔建筑陶瓷砖导热系数的变化规律。结果表明,以淀粉和碳粉为造孔剂制备的建筑陶瓷均以开口气孔为主,整体连通性强。淀粉造孔的孔径尺寸相对比较均匀,显气孔率高于碳粉。随着造孔剂含量的增加,显气孔率和吸水率线性增大,孔径分布趋于分散。多孔建筑陶瓷砖导热性的各影响因素之间具有明显的耦合作用特征,即含水率越高,温度变化对其导热性的影响越显著;显气孔率越高,导热系数对含水量的变化越敏感。As multiphase composite material,thermal conductivity of porous building ceramic tiles is influenced by multiple factors such as temperature,humidity and porosity.The variation law of thermal conductivity of po⁃rous building ceramic tiles is studied through experiments under different pore structures,porosity,and mois⁃ture content conditions.The results indicate that building ceramics prepared with starch and carbon powder as pore forming agents are mainly characterized by open pores with strong connectivity.The pore size formed by starch is relatively uniform with the higher apparent porosity.With the dosage increase of pore forming agent,the apparent porosity and water absorption increase linearly with uneven pore size distribution.There is a clear coupling effect between the various influencing factors of the thermal conductivity of porous building ceramic tiles,that is,the higher the moisture content,the more significant the impact of temperature changes on their thermal conductivity.The higher the apparent porosity,the more sensitive the thermal conductivity changes with water content.

关 键 词：建筑陶瓷砖 导热系数 含水量 气孔 

分 类 号：TU522.1[建筑科学—建筑技术科学]