再生混凝土自保温砌块墙体传热性能

Heat Transfer Characteristics of Recycled Concrete Self Insulation Block Wall

摘要:

测试了不同砌块墙体的热工性能，推导了多层墙体不稳定传热的传热系数，并编制相应的计算程序对不同材料墙体的传热系数进行了理论计算.结果表明：当在墙体内外侧面粉刷20mm厚普通砂浆或保温砂浆时，190mm再生混凝土自保温砌块墙体的传热系数为1940W/(m2·K)或0961W/(m2·K)，分别比相同条件下240mm黏土砖墙体和190mm普通混凝土砌块墙体的传热系数降低295%，3602%或144%，1779%；再生混凝土自保温砌块墙体的传热系数受砌块中再生细骨料和玻化微珠掺量影响，当玻化微珠掺量(体积分数)大于60%时，各种墙体传热系数相差不大；不同墙体传热系数的实测值和理论计算值的差值小于5%.再生混凝土自保温砌块墙体具有良好的节能效果，具有工程应用价值.

Abstract:

Thermal performance of different multi level walls were investigated, the unsteady heat conduction reaction coefficient of multi level wall was derived and corresponding computer program was presented, the heat transfer coefficients of the different kinds of multi level wall were calculated by program. The results show that when pasting 20mm thickness mixed mortar or insulation mortar on outer and inner surface of multi level wall, the heat transfer coefficient of 190mm thickness recycled concrete self insulation block wall is 1940W/(m2·K) or 0961W/(m2·K), 295%，3602% and 144%，1779% lower than that of 240mm thick clay brick wall and 190mm thick normal concrete block wall, respectively. The heat transfer coefficient of recycled concrete self insulation block wall is closely related to the properties of raw materials, i.e. recycled fine aggregate replacement ratio and glazed hollow bead volume fraction. The heat transfer coefficient of different mix proportion of recycled concrete self insulation block walls are little different when glazed hollow bead volume fraction is higher than 60%. The difference of theoretically calculated and experimentally measured heat transfer coefficient is within 5%. The wall of developed recycled concrete self insulation block has a good energy saving effect.