严寒地区加气混凝土自节能墙体性能及专用砂浆研究

发布时间：2018-02-16 06:44

  本文关键词： 自节能墙体 砌筑保温砂浆 抹面保温砂浆 温度应力 墙体变形　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：加气混凝土作为唯一能满足建筑节能65%的单一墙体材料,因轻质、保温、优异的抗震性能同时兼具一定强度,被广泛的用作建筑结构填充墙。在使用普通水泥砂浆砌筑和抹面时,容易出现墙体热桥、表面砂浆开裂、脱落等问题。针对这些问题,本文研究了加气混凝土用砌筑和抹面保温砂浆,保温砂浆在强度和热工性能上都能满足加气混凝土墙体的使用,同时也对墙体的温度场、温度应力进行分析计算。采用玻化微珠为轻骨料,配制加气混凝土砌筑用保温砂浆。当玻化微珠掺量为水泥质量的60%、粉煤灰取代量为25%、胶粉掺量为2.0%时,砂浆的抗压强度达5.8 MPa,导热系数也可以达到0.13 W/(m·K),满足抗压强度5.0 MPa导热系数小于0.15 W/(m·K)的目标值。在此基础上,探究了不同灰缝厚度时加气混凝土砌体的力学性能,厚灰缝砌体抗压强度达到3.72 MPa,薄灰缝砌体的抗压强度、剪切强度分别为3.10 MPa和0.222 MPa。以玻化微珠、水泥、粉煤灰、Ca(OH)2、聚丙烯纤维及其他外加剂为原材料,配制加气混凝土专用抹面保温砂浆。当水泥、粉煤灰、Ca(OH)2、玻化微珠、聚丙烯纤维纤维、可再分散乳胶粉、羟丙基甲基纤维素醚以及减水剂、引气剂的质量比为83:10:7:100:0.6:1.5:0.6:0.3:0.02时,抹面保温砂浆的抗压强度可达2.6 MPa,抗折强度达0.7 MPa,粘结强度为0.43 MPa,砂浆的压折比小于3,蒸汽渗透系数为0.88×10-4 g/(m·h·Pa)。针对加气混凝土墙体在使用过程中出现的温度应力以及温度变形,运用ANSYS软件进行模拟分析。结果表明,外抹保温砂后,墙体基体在冬季、夏季的温度变化分别降低1.668℃和5.315℃,嵌固墙板界面处温度应力降低49%,自由墙板界面处温度应力降低30%,墙体变形也更小。
[Abstract]:Aerated concrete, as the only single wall material that can meet the energy saving of 65% buildings, has a certain strength because of its light weight, heat preservation and excellent seismic performance. It is widely used as the filling wall of building structure. When using ordinary cement mortar to build and wipe the surface, it is easy to appear the wall hot bridge, the surface mortar crack, the fall off and so on. In order to solve these problems, In this paper, the masonry and surface insulation mortar for aerated concrete are studied. The thermal properties and strength of insulation mortar can satisfy the use of aerated concrete wall, and at the same time, the temperature field of the wall is also studied. The thermal stress is analyzed and calculated. The thermal insulation mortar for aerated concrete masonry is prepared by using vitrified microbeads as light aggregate. When the content of glass microbeads is 60% of cement quality, the amount of replacement of fly ash is 25 and the amount of rubber powder is 2.0. The compressive strength of mortar is 5.8 MPA, and the thermal conductivity can reach 0.13 W / m 路KG, which satisfies the target value of compressive strength 5.0 MPa < 0.15 W / m 路K. On this basis, the mechanical properties of aerated concrete masonry with different thickness of ash joint are investigated. The compressive strength of thick ash joint masonry is 3.72 MPA, and the compressive strength and shear strength of thin ash joint masonry are 3.10 MPa and 0.222 MPa respectively. The raw materials are vitrified microbeads, cement, fly ash, polypropylene fiber and other admixtures. When cement, fly ash, glass microbeads, polypropylene fiber fiber, redispersible emulsion powder, hydroxypropyl methyl cellulose ether and water reducer, the mass ratio of air entraining agent is 83: 10: 10: 1: 1: 1: 1: 1: 0. 3: 0. 02. The compressive strength, flexural strength, bond strength, compression ratio and steam permeability coefficient of mash mortar are 2.6 MPA, 0.7 MPA, 0.43 MPA, and 0.88 脳 10 ~ (-4) g / m 路h 路Pa, respectively. The temperature stress and deformation of aerated concrete wall are analyzed. ANSYS software is used to simulate and analyze. The results show that the temperature changes of the wall matrix in winter and summer are reduced by 1.668 鈩，

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