The Research On Thermal Insulation Properties And Mechanical Properties Of EPS Interlayer Wall

Statistics show that the equivalent of our unit construction area of heating energy consumption in developed countries with similar climatic conditions3-5times. However, thermal comfort degree is much inferior to them. Building energy conservation is the most cost-efficient way to conserve energy. In the construction energy, the exterior wall has larger effects on the energy consumption, Influence proportions of which is50%.Outside heat preservation of exposed wall is among the most widely used at home and abroad. However, the problem of their durability of outside heat preservation of exposed wall has been highlighted and concerned. The life expectancy of25years cannot be guaranteed when outside heat preservation of exposed wall is used and maintained correctly. Some of the project only is used3～5years. Cavity wall is durability-energy-efficient wall which suits different areas. Therefore,the article is that the research on thermal insulation properties and mechanical properties of EPS Interlayer wall.EPS is a light-duty high molecular polymer, It is a foam, which using polystyrene resin by adding the blowing agent, at the same time heating to soften, resulting in gas, forming a rigid closed cell structure.This article uses of thermal performance of building energy-saving theory of knowledge, has a analysis about energy-saving effect of EPS interlayer wall in frosty and cold area, including:effect of wall insulation、effect of wall heat insulation、analysis of the wall condensing. The results showed that:The thermal performance of EPS insulation interlayer wall in this article all meet the Energy-saving standard in frosty and cold area,the insulation effect is good,and not condensing.EPS insulation interlayer wall can be widely used in frosty and cold area. Meanwhile, this article calculated the minimum thickness of insulation materials.Meanwhile, we found that stress and strain curve include linear elastic section and plastic deformation segments,and linear elastic period is very short.As loading rate increased,while the elastic modulus and yield stress increased. When EPS under in triaxial stress state, as confining pressureincrease,while the yield stress and elastic modulus are decreases.By a finite-element numerical experiment in the planar about EPS interlayer wall model,and has a detailed and comprehensive analysis of insulating layer thickness of different the EPS, the vertical compressive stress of different the EPS,the mechanical performance of different EPS interlayer wall with different density, it provides a theoretical basis for application of the EPS composite interlayer wall in the actual project. The conclusions are got from the finite-element numerical experiment in this paper as following:①For2different density EPS interlayer wall of numerical experiments found that, the density of16kg/m3for EPS interlayer wall is good to the density of30kg/m3.②For4different insulation thickness EPS interlayer wall of numerical experiments found that, the carrying capacity of the interlayer wall which has100mm EPS insulation layer thickness is6%lower than80mm; the relative displace disparity of the interlayer wall which has100mm EPS insulation layer thickness is35.1%increase over80mm, it shows that the EPS insulation layer thickness has a little effect on the carrying capacity of the sandwich,but has more effect on overall collaborative performance of the wall.③For8different vertical compressed stress EPS interlayer wall of numerical experiments found that, vertical compressed stress has more effect on shear capacity and coordinated working performance of the interlayer wall. As the vertical compressed stress increase, fully-factored load of interlayer wall increases, while collaborative work performance weakened, When more than0.5Mpa, collaborative work performance is significantly reduced. It is recommended that, when the EPS insulation layer thickness larger height should be limited to the housing or in high intensity region, try to control vertical compressive stress in0.5Mpa.