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挤塑板是否适用于外墙保温?
作者:admin 来源:本站 发布时间:2019-03-26 13:55:18 浏览次数:39
山东挤塑板(XPS)在国内建筑外墙外保温中已经得到了广泛的应用,分析原因大抵有二,一是挤塑板导热系数低,25℃时导热系数在0.025~0.028W/(moK),且由于吸水率小,而具有导热系数长期保留率高,可以最经济(即最小厚度)的用料满足建筑节能的要求;二是强度大。有些人认为尤其是做面砖饰面用挤塑板更加安全。
Shandong Extruded Plastic Sheet (XPS) has been widely used in exterior thermal insulation of building exterior walls in China. There are two reasons for analysis. One is that the thermal conductivity of extruded sheet is low. The thermal conductivity of extruded sheet is between 0.025 and 0.028 W/(moK) at 25 C. Because of its low water absorption and high long-term retention rate of thermal conductivity, the most economical (i.e. minimum thickness) material can meet the requirements of building energy saving. The degree is large. Some people think that it is safer to use Extrusion board especially for facing bricks.
我们摘取一些重要方面,以反映目前挤塑板的应用现况,并提供一些现存问题的解决措施。
We extract some important aspects to reflect the current application status of extruded panel and provide some solutions to existing problems.
去皮处理。普通挤塑板表皮为光面,其表皮与胶粘剂及抹面砂浆的可粘接性很差。目前可耐福公司和陶氏化学等均采用挤塑板去皮工艺处理。一方面可使表面粗糙均匀有利粘贴,其与胶粘剂和抹面砂浆的拉伸黏结强度、耐水和耐冻融强度均在0.25MPa以上,大大提高了系统的黏结力,加大了可靠性。另一方面也通过去皮处理均匀释放了一定量的内部应力。
Peeling treatment. The surface of ordinary Extrusion board is smooth, and its adhesion to adhesives and plastering mortar is poor. At present, Knauf Company and Dow Chemistry all adopt Extrusion board peeling process. On the one hand, it can make the surface rough and uniform, and the tensile bond strength, water resistance and freeze-thaw resistance of the system with adhesives and plastering mortar are all above 0.25 MPa, which greatly improves the bond strength of the system and enhances the reliability. On the other hand, a certain amount of internal stress is evenly released by peeling treatment.
尺寸稳定性。行业里多认为挤塑板用于外墙外保温由于尺寸稳定性差,会因气候的影响而导致其尺寸变形,最终导致饰面层涂料开裂,不如EPS系统。实际上我们可以从系统中的三种材料的弹性模量来看,砂浆约为15500MPa,EPS约为4~6MPa,XPS约为7~9MPa。虽然EPS弹性模量比XPS略小,但与砂浆弹性模量相比,EPS与XPS都属于同一数量级,材料相互之间的约束不会有本质的改变。也就不存在砂浆对EPS的约束比对XPS的约束效果更好的说法,而诸多的工程实例也证实此效果。
Dimensional stability. In the industry, it is generally believed that Extrusion board used for external insulation of exterior wall will cause dimension deion due to poor dimensional stability, and eventually lead to coating cracking, which is inferior to EPS system. In fact, we can see from the elastic modulus of the three materials in the system that mortar is about 15500 MPa, EPS is about 4-6 MPa and XPS is about 7-9 MPa. Although the elastic modulus of EPS is slightly smaller than that of XPS, compared with the elastic modulus of mortar, both EPS and XPS belong to the same order of magnitude, and the restraint between materials will not change essentially. There is no saying that the restraint effect of mortar on EPS is better than that of XPS, and many engineering examples have proved this effect.
国标中规定去皮型挤塑板的尺寸稳定性≤2.0%,可耐福针对这一点做过一些研究,通过外墙外保温系统在一定面积范畴设置伸缩缝,即可有效地释放系统各层的变形。
The dimension stability of peeled extruded panel is stipulated in the national standard - le; 2.0%. Knauf has done some research on this point. By setting expansion joints in a certain area of external wall thermal insulation system, the deion of each layer of the system can be effectively released.
国标情况。目前挤塑板的应用还没有一本国家的有关标准。由此多少应用方都借用膨胀聚苯板的技术标准。2009年6月,上海建科院和国家建筑标准设计院联合组织编制挤塑板抹灰外墙外保温系统的技术标准,同时由可耐福公司编制的国标08CJ16《挤塑板保温系统建筑构造》也于2009年8月在国家建筑标准设计院进行修编。行业内正在努力加强挤塑板的应用规范和标准,从而来保证挤塑板在外墙外保温中的合理使用。
The situation of national standard. At present, there is no national standard for the application of extruded sheets. As a result, many applicants borrow the technical standard of expanded polystyrene board. In June 2009, the Shanghai Academy of Construction Sciences and the National Institute of Architectural Standards and Design jointly organized the compilation of technical standards for plastering exterior wall thermal insulation system with extruded panels. At the same time, the national standard 08CJ16 "Building Structure of Extruded Panels Thermal Insulation System" compiled by Knauf Company was also revised in August 2009 by the National Institute of Architectural Standards and Design. In the industry, efforts are being made to strengthen the application norms and standards of extruded panels, so as to ensure the rational use of extruded panels in external wall insulation.
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