当前位置: 首页 > 公司新闻 > 疑难解答 > 外墙保温材料体系分析二

相关商品

浏览历史

外墙保温材料体系分析二
华东保温商城 / 2014-10-15
首先,由于外保温使建筑结构处于保温层的保护中,使建筑结构所处温度环境稳定,有利于建筑结构的保护,增强耐久性。另外,外保温将建筑在外面包裹,保温的面积大,更有利于保温节能。关于外保温存在墙体开裂的问题,我们可以通过在外保温材料及施工方法等方面的改进,使之达到规定的施工质量。
First of all, due to external thermal insulation structure in the protection of the thermal insulation layer, make the temperature environment of building structure is stable, be conducive to the protection of the building structure, increase the durability. In addition, the building exterior insulation is wrapped outside, heat preservation area is large, more conducive to heat preservation and heat insulation. About external thermal insulation wall cracking problems, we can through the outer insulation materials and construction methods of improvement, to meet the construction quality.
具体方法如下:
The specific method is as follows:
1)建筑的外保温应该是整个建筑全部的外保温。
1) the building exterior insulation should be the whole construction of external thermal insulation.
上面我们曾讲过,由于不完全外保温使得建筑的雨篷等构件出现裂缝,因此,为避免裂缝的产生,应该对建筑进行全面的保温,包括雨篷等构件。
We have talked about above, due to the incomplete makes the building exterior insulation awning components such as cracks, therefore, to avoid the generation of cracks, should be to comprehensive heat preservation of building, including awning components.
外墙外保温开裂的主要原因是因为保温材料与外装饰材料的线膨胀系数不同产生的,我们预防裂缝的原理是:通过减小建筑结构外保温材料同外装饰找平砂浆、外饰面等材料的线膨胀系数比,是材料之间产生逐层渐变,柔性释放应力,以起到预防裂缝的作用。
Exterior insulation cracking of the main reason is that thermal insulation materials and outside decoration materials the linear expansion coefficient of different generation, we crack prevention principle is: by reducing building structure heat preservation material with external decoration leveling mortar, the exterior surface of material, such as linear expansion coefficient ratio, stepwise gradient between material, flexible to release stress, to play the role of prevention of crack.
2)保温材料的选择。
2) the selection of insulating material.
现在施工的建筑中,保温材料的使用以挤密苯板、聚苯板、聚苯颗粒保温材料为主。挤密苯板具有密度大,导热系数小等优点,它的导热系数为0.029W/m.K,而抗裂砂浆的导热系数为0.93W/m.K),两种材料的导热系数相差32倍,而聚苯板的导热系数为0.042W/m.K,同抗裂砂浆相差22倍,因此挤密苯板与聚苯板相比,抗裂能力弱于聚苯板。一聚苯颗粒为主要原料的保温隔热材料由胶粉料和胶粉聚苯颗粒做成,胶粉材料作为聚苯颗粒的粘结材料一般采用熟石灰粉—粉煤灰—硅粉—水泥为主要成分的无机胶凝体系,该类材料的导热系数一般为0.06W/m.K,与抗裂砂浆相比相差16倍。该种材料与挤密苯板和聚苯板相比,导热系数要小得多,因而能够缓解热量在抗裂层的积聚,使体系受温度骤然变化产生的热负荷和应力得到较快释放,提高抗裂成的耐久性。
Now the construction of buildings, the use of thermal insulation material with compacting benzene board, polystyrene board, polystyrene particles insulation materials mainly. Compacting benzene board has big density, the advantages of small thermal conductivity, its coefficient of thermal conductivity is 0.029 W/m.K, and anti-crack mortar coefficient of thermal conductivity is 0.93 W/m.K), the coefficient of thermal conductivity of two materials are 32 times, and the coefficient of thermal conductivity of polyphenyl plate is 0.042 W/m.K, with anti-crack mortar differs 22 times, therefore compacting benzene board compared with polystyrene, anti-crack ability weak in polystyrene. A polystyrene particles as the main raw material of thermal insulation materials made from powder and powder polystyrene particles, powder materials as a bonding material polystyrene particles generally USES hydrated lime powder, fly ash, silicon powder, cement as the main component of inorganic gel system, coefficient of thermal conductivity of this materials generally is 0.06 W/m.K, compared with the anti-crack mortar 16 times. This kind of material is compared with the benzene board and polystyrene board compaction, coefficient of thermal conductivity is much smaller, and therefore can alleviate the accumulation of heat in the anti-cracking layer, make the system by the sudden change of heat load and temperature stress are quickly released, the durability of the crack into.
3)增强网的选择。
3) to strengthen network selection.
玻纤网格布作为抗裂保护层软赔进的关键增强材料在外墙外保温技术中的应用得以快速发展,一方面它能有效的增加保护层的拉伸强度,另一方面由于能有效分散应力,将原本可以产生的款裂缝分散成许多较细裂缝,从而形成抗裂作用。由于保温层的外保护开裂砂浆为碱性,玻纤网格布的长期耐碱性对抗裂缝就具有了决定性的意义。从耐久性上分析,高耐碱纤维网格布要比无碱网格布和中碱网格布的耐久性好得多,至少能够满足25年的使用要求,因此,在增强网的选择上,建议使用高耐碱的网格布。
Glass fiber grid cloth as the key part of anti-cracking layer soft compensate into the reinforced material in the application of external thermal insulation technology rapid development, on the one hand, it can effectively increase the tensile strength of the protective layer, on the other hand due to disperse stress effectively, will generate money could spread into many fine cracks, thus forming a crack. Due to the insulation cracking mortar for alkaline outer protection, long glass fiber grid cloth alkali resistance against crack has the decisive significance. From the analysis on the durability, high alkali resistant fiber mesh cloth than no alkali grid cloth and in much better durability, alkali grid cloth can satisfy the use requirement of 25 years at least, therefore, on the choice of enhancing network, it is recommended to use high alkali grid cloth.
4)保护层材料的选择。
4) coating material choice.
由于水泥砂浆的强度高、收缩大、柔韧性变形不够,直接作用在保温层外面,耐候性差,而引起开裂。为解决这一问题,必须采用专用的抗裂砂浆并辅以合理的增强网,并在砂浆中加入适量的纤维,抗裂砂浆的压折比小于3.如外饰面为面砖,在水泥抗裂砂浆中也可以加入钢丝网片光,钢丝网片孔距不宜过小,也不宜过到,面砖的短边应至少覆盖在两个以上网孔上,钢丝网应采用防腐好的热镀锌钢丝网。
Due to shrinkage of cement mortar with high intensity, large, flexible deformation is not enough, direct effect on the outside of the insulation, weather resistance is poor, and cause cracking. To solve this problem, must use dedicated anti-crack mortar and complemented by reasonable enhancement of the network, and add the right amount of fiber in cement mortar, anti-crack mortar crushing ratio less than 3. Such as outside facing brick, the concrete anti-crack mortar can also add light steel wire mesh, wire mesh pitch shoulds not be too small, also shoulds not be too that the short side of the brick should cover at least in two holes on the online wire mesh should be anticorrosive good hot dip galvanized wire mesh.
5)无空腔构造提高体系的稳定性。
5) no cavity structure to enhance the stability of system.
在采用聚苯板作外保温的设计中,保温层主要承受的是重力和风压,由于聚苯板强度的限制,使保温层开裂,甚至脱落。为了提高保温板的强度,应尽可能提高粘结面积,采用无空腔,以满足抗风压破坏的要求。
In the use of polystyrene as the design of external thermal insulation, thermal insulation layer is mainly under gravity and wind pressure, because of the limitation of polystyrene strength make insulation cracking, or even fall off. In order to improve the strength of the insulation board, should as far as possible to improve the bonded area, adopting the cavity, in order to satisfy the requirement of damage.
建筑外墙保温是近年来新兴的施工方法,由于内保温、混合保温等方法在设计中的缺陷,建议采用外保温,并按照逐层渐变,柔性释放应力的原则,选择材料及施工方法,以达到保温、抗裂的目的。由于外墙保温体系是一个有机的整体,组成的各相关层协同作用不仅要求柔性渐变,而且应有一定的相容性、协同性,形成一个复合整体。
Building external wall thermal insulation is emerging in recent years, the construction methods, such as insulation, mixed heat preservation method in the design of the defect, recommend external thermal insulation, and according to the gradient step by step, the principle of flexible release stress, select materials and construction methods, to achieve the purpose of heat preservation, crack resistance. As a result of exterior wall thermal insulation system is an organic whole, each related layer of synergy not only requires the flexible gradient, and should have a certain compatibility, collaborative, forming a complex whole.
 

用户评论(共0条评论)

  • 暂时还没有任何用户评论
总计 0 个记录,共 1 页。 第一页 上一页 下一页 最末页
用户名: 匿名用户
E-mail:
评价等级:
评论内容:
验证码: captcha