2022.06.22
One, two system performance comparison
1. Thermal insulation performance:
The same thickness of EPS and XPS thermal insulation performance is gradually increased. EPS was 0.041 and XPS was 0.030. Therefore, under the condition of achieving the same thermal insulation effect, the thickness of XPS board is thinner than that of EPS board, but the price of pure board XPS board is more expensive than that of EPS board. If the craftsmanship and the height of the building are fully considered, the price per square meter of XPS is more expensive than EPS.
For thermal insulation, it is mainly to see the thermal inertia index D, and the D value is proportional to the heat storage coefficient. But as far as the whole system is concerned, the heat storage of 200mm concrete is large enough, and the external insulation layer is added to fully meet the energy-saving requirements. This is also the reason why the national standard requires the comprehensive thermal conductivity and heat storage coefficient of the wall to meet the requirements at the same time. Current EPS or XPS thin plastering systems are fully satisfactory.
2. Strength:
The strength pointed out here should be the tensile strength. The bulk density of the polystyrene board has an absolute relationship with the tensile strength. Generally, the tensile strength of the EPS with a bulk density of 18Kg/m3 is 110-120KPa, and the bulk density of 20Kg/m3 is about 140KPa. The bulk density of XPS is normally from 25Kg to 45Kg, and the strength is from 150KPa to 700KPa or higher. (The premise is that the thermal conductivity is about 0.03).
At present, the strength of XPS board is 200KPa-250KPa. This kind of strength cannot be achieved by many XPS boards in China. The EPS board is below 100KPa. In the case of more and more abundant facade decoration and frequent typhoons in coastal areas, the strength is very high. It is important, especially for some exterior wall tiles or high-rise buildings, that both panels need to be reinforced or fixed with fasteners. The drawing of the tile should be greater than 400KPa, even XPS can not bear it. The solution is to fix the steel mesh to the base by expanding the bolt, which can disperse the tensile stress in the three-dimensional space, so as long as the anchoring is proper, the drawing failure must be in the composite. The crack-resistant mortar layer of the steel mesh is not a big problem.
Compared with EPS, the strength of XPS board is higher, but compared with EPS, due to the nature (brittleness) of XPS board, when the pasting area is large, the possibility of cracking of the exterior wall finishing layer is high, especially the coating surface layer. Flexibility is a matter of material properties. Take plastering as an example. Perceptual knowledge usually applies the plastering batch to the polystyrene board, and then see how far the polystyrene board is bent without cracks on the plastering surface. If the flexibility is good, it can be bent several times. won’t crack. Similar to the ductility index in waterproofing materials. But in terms of the material itself, flexible EPS is better than XPS.
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