蒸压加气混凝土自保温砌块墙体传热性能试验研究

发布时间：2018-05-18 20:02

  本文选题：蒸压加气混凝土自保温砌块 + 传热系数　； 参考：《华北水利水电大学》2017年硕士论文

【摘要】：随着建筑节能在各地全面开展的大形势下,作为节能墙材的蒸压加气混凝土自保温砌块一直引人瞩目,并受到国家政策的鼓励和支持,具有广阔的发展前景。本文以B06级蒸压加气混凝土自保温砌块为例,开展了气孔率、含水率和蒸压加气混凝土自保温砌块导热系数关系的理论研究,开展了蒸压加气混凝土自保温砌块墙体传热性能的试验研究,也开展了蒸压加气混凝土自保温砌块墙体的灰缝、抹灰、墙厚与传热系数之间的关系的研究。本文的主要成果包括以下几个方面:(1)对蒸压加气混凝土自保温砌块导热系数理论模型的研究,得到如下结论:推导出了含湿状态下能使模型计算结果与实测值较为吻合的有实际应用价值的导热系数理论模型,并指出蒸压加气混凝土自保温砌块的导热系数随着气孔率的增加而减小、随着含水率的增加而增加。(2)对蒸压加气混凝土自保温砌块墙体的传热性能试验,得到如下结论:蒸压加气混凝土自保温砌块墙体传热系数的实测值处在0.5~0.6 W/(m2·K)范围内,其传热系数比其他材料的墙体低,保温隔热效果更好;不同灰缝形式的蒸压加气混凝土自保温砌块墙体的传热系数实测值存在区别,抹灰后的蒸压加气混凝土自保温砌块墙体的传热系数实测值低于抹灰前的传热系数。(3)对蒸压加气混凝土自保温砌块墙体的微热桥问题进行了研究,得到如下结论:灰缝处的微热桥问题显著,砌筑砂浆种类、砌筑形式、灰缝厚度都对蒸压加气混凝土自保温砌块墙体的传热系数产生影响,当采用薄灰缝(3~5mm左右)时,选用薄层砌筑砂浆砌筑为宜,当采用厚灰缝(≤20mm)时,采用保温砌筑砂浆进行砌筑为宜;竖缝灰缝采用填塞岩棉方式的墙体保温隔热效果良好、施工速度快,且抗震等力学性能并不因此而减弱,该砌筑方式应进行推广;蒸压加气混凝土自保温砌块墙体的传热系数随着灰缝厚度的增加而增大,灰缝越厚,微热桥问题越明显,墙体能耗越大;计算出了灰缝对蒸压加气混凝土自保温砌体导热系数的修正系数,为建筑节能设计提供理论指导和计算依据。蒸压加气混凝土自保温砌块墙体的传热系数随着抹灰厚度的增加而减小,抹灰越厚,则墙体保温隔热越好,能耗越低。蒸压加气混凝土砌块墙体的传热系数随着墙体厚度的增加而减小,墙体越厚,则墙体能耗越小。
[Abstract]:With the development of building energy conservation all over the world, the autoclaved aerated concrete self-insulating block, as an energy-saving wall material, has been attracting attention, and has been encouraged and supported by national policies, and has a broad development prospects. Taking B06 autoclaved aerated concrete self-insulating block as an example, the relationship among porosity, moisture content and thermal conductivity of autoclaved aerated concrete self-insulating block is studied theoretically in this paper. The experimental study on the heat transfer performance of autoclaved aerated concrete self-insulating block wall is carried out, as well as the research on the relationship between the gray joint, plastering, wall thickness and heat transfer coefficient of autoclaved aerated concrete self-insulating block wall. The main achievements of this paper include the following aspects: 1) the theoretical model of thermal conductivity of autoclaved aerated concrete self-insulating block. The conclusions are as follows: a theoretical model of thermal conductivity with practical application value is derived, which can make the calculated results of the model agree with the measured values under the wet state. It is pointed out that the thermal conductivity of autoclaved aerated concrete self-insulating block decreases with the increase of porosity and increases with the increase of moisture content. The results are as follows: the measured heat transfer coefficient of autoclaved aerated concrete self-insulating block wall is in the range of 0.5 ~ 0.6 W/(m2 / K), its heat transfer coefficient is lower than that of other materials, and the thermal insulation effect is better; The measured heat transfer coefficient of autoclaved aerated concrete self-insulating block wall with different ash joints is different. The heat transfer coefficient of autoclaved aerated concrete self-insulating block wall after plastering is lower than that before plastering. The conclusions are as follows: the problem of micro-heat bridge in ash joints is obvious. The types of masonry mortar, masonry form and thickness of ash joints all have an effect on the heat transfer coefficient of autoclaved aerated concrete self-insulating block wall, when the thin ash joint is used, the heat transfer coefficient of the wall is about 3mm. It is appropriate to choose thin layer masonry mortar for masonry, when thick ash joint (鈮，

本文编号：1907011