保温装饰复合墙板的耐候性试验及仿真

发布时间：2018-04-30 14:25

本文选题：耐候性 + 保温层厚度　；参考：《湖南科技大学》2014年硕士论文

【摘要】：随着建筑节能技术的逐步发展，新型保温材料不断涌现。本文针对近年来出现的一种新型保温材料—保温装饰复合板，结合外墙外保温技术规程，围绕有关其耐候性的影响因素展开，主要研究内容如下： 1.进行了耐候性条件下粘结砂浆的抗折强度和质量试验，经研究得出,养护期间的水分侵蚀会严重影响粘结砂浆抗折强度的发展，，使用过程中冻热循环对其抗折强度的不利影响要远大于热湿循环。当粘结砂浆的抗折强度充分发展前受到冻热循环时，其质量会急剧减小。 2.通过ANSYS软件模拟分析了外保温系统保温层厚度分别为20mm、30mm、40mm时，在高温-淋水循环和加热-冷冻循环下保温层内表面温度场分布情况和特殊节点温度变化的规律，粘结砂浆内外表面和外饰面温度应力的分布情况以及外饰面的位移分布情况，研究得出：（1）保温层厚度相同时(不论外保温系统处于高温还是低温情况下)：保温层内表面的温度场及粘结砂浆层的温度应力，远离窗口的墙体部位，各节点处处相同；窗口部位，沿着洞口四边以等势线的形式逐渐变化；外饰面上产生的最大位移在窗口右侧，温度应力则在窗角处最大，远离窗口处各节点的温度应力和位移相差很小。（2）保温层厚度越大，保温隔热效果越好，室内墙面的温度波动越小，且粘结砂浆的温度应力减小，但外饰面上洞口对温度应力和位移的影响范围则变大。（3）高温-淋雨循环和加热-冷冻循环下粘结砂浆层的温度应力和外饰面的温度应力及位移分布相似。外保温系统出现最大温度应力的时刻：在高温-淋雨循环时为第10800秒，在加热-冷冻循环的冷冻阶段，则位于冷冻结束时刻。 3.以夏热冬冷地区的长沙为例，对冬季时外保温系统的内部冷凝进行了检验。通过计算发现：保温层厚度的变化不会引起外保温系统内部冷凝结露的发生。由本文的试验研究可以得出：夏热冬冷地区（以湖南为例）外保温施工的最佳季节是早秋。综合保温性、粘结砂浆的温度应力分析以及经济性考虑，外保温系统选用40mm厚度的保温装饰复合板较为适宜。
[Abstract]:With the gradual development of building energy-saving technology, new thermal insulation materials are emerging. In this paper, according to a new type of thermal insulation material-thermal insulation decorative composite board, combined with the external wall insulation technical specification, around the influence factors of its weathering resistance, the main research contents are as follows: 1. The flexural strength and quality of bonded mortar under weathering condition were tested. It was concluded that water erosion during curing would seriously affect the development of flexural strength of bonded mortar. The adverse effect of freezing heat cycle on its flexural strength is much greater than that of heat and moisture cycle. When the flexural strength of the bonded mortar is fully developed, the mass of the mortar decreases rapidly when it is subjected to freezing and heat cycling. 2. The distribution of temperature field on the inner surface of the insulation layer and the variation of the temperature of the special node were analyzed by ANSYS software when the thickness of the insulation layer was 20mm or 30mm or 40mm, respectively, under the high-temperature water-leaching cycle and the heating-freezing cycle. The distribution of the temperature stress and the displacement distribution of the inner and outer surface of bonded mortar are studied. 1) when the thickness of the insulation layer is the same (whether the external insulation system is in high or low temperature): the temperature field on the inner surface of the insulation layer and the temperature stress of the bonded mortar layer are far away from the wall part of the window, and the nodes are everywhere the same; the window part, The maximum displacement on the exterior surface is on the right side of the window, and the temperature stress is the largest at the corner of the window, and the difference of the temperature stress and displacement between the nodes far away from the window is very small. 2) the greater the thickness of insulation layer, the better the thermal insulation effect, the smaller the temperature fluctuation of indoor wall, and the smaller the temperature stress of bonded mortar, but the larger the influence range of the opening on temperature stress and displacement is. 3) the temperature stress of bonded mortar under high temperature-rain cycle and heating-freezing cycle is similar to the distribution of temperature stress and displacement of external surface. The time of maximum temperature stress in the external thermal insulation system is 10800 seconds in the high temperature-rain cycle and at the end of the freezing stage in the heating-freezing cycle. 3. Taking Changsha in hot summer and cold winter as an example, the internal condensation of external thermal insulation system in winter was tested. It is found by calculation that the change of the thickness of insulation layer will not cause condensation and condensation in the external insulation system. From the experimental study in this paper, it can be concluded that the best season of external insulation construction in hot summer and cold winter area (Hunan as an example) is early autumn. The thermal insulation composite plate with the thickness of 40mm is suitable for the external insulation system, the thermal stress analysis of the bonded mortar and the economic considerations are taken into account.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU551

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