The insulation material in the decoration plays an extremely important role in the surface radiant heating system. It cuts down the heat transmitted from the ground, so that the heat is beneficial to household metering, and the indoor temperature distribution can be more reasonable and the heat loss can be reduced. , to achieve energy-saving comfort.
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So how do you choose insulation materials? This article according to the requirements of the heat insulation material of the "China Terrestrial Radiant Heating Technology Regulations" JGJ142-2004 (hereinafter referred to as the "Regulations"), combined with construction and economic factors, will use low-density foamed cement (hereinafter referred to as "foamed cement "Comparison" with commonly used polystyrene foam panels (hereinafter referred to as "polyphenylene sheets") to identify their respective advantages and disadvantages.
First, strength In general circumstances, the strength of the foamed cement insulation layer is significantly higher than the strength of the polystyrene board insulation layer. After properly curing, the normally constructed foamed cement insulation layer has a cubic compressive strength of more than 2 MPa when the bulk density is 400 kg/cm 3 , sufficient to carry various construction loads. When the coil pipe is constructed, the hot water pipe can be directly fixed on the foamed cement, and the construction is convenient. Generally, there is no defect such as collapse deformation. Even if it is, it is easy to find repairs in time. Over time, its intensity will increase. When using polyphenylene plate as a heat insulation layer, the construction of the coil pipe must be handled with care. After stepping on and pouring concrete, the polyphenylene plate tends to have a large compression deformation. In severe cases, the polyphenylene plate with a thickness of 2 cm is actually less than 1 cm.
Second, the insulation performance "Procedure" stipulates that the use of polystyrene foam panels floor slab between the thickness of 20 mm. When using other insulating materials, the thickness can be determined according to the principle of equivalent thermal resistance. According to calculations, the thermal insulation effect of foamed cement is obviously better than the thermal insulation effect of polystyrene board. From the calculation data, the difference between the two is more than 40%. If the thickness of foamed cement is determined by the principle of equivalent thermal resistance, it can be calculated that: 28mm thick foamed cement corresponds to 20mm thick polystyrene board. However, under normal circumstances, the average thickness of foamed cement is generally not less than 40mm, which not only ensures the insulation effect, but also leveling the original rough floor, is similar to the material such as polystyrene board can not be compared.
Third, stability Foam cement and general concrete, are all inorganic materials, have extremely stable chemical properties, under normal circumstances, will not aging and deterioration after a hundred years, and do not burn, environmental protection; polystyrene board is easy to aging ( The service life is generally 15 to 25 years. In the course of use, due to continuous changes in temperature, it is easier to be compressed and deformed. When the use temperature exceeds 75 °C, it will also produce heat deformation.
IV. Construction Factors Foamed cement is suitable for mechanized large-area construction, with low labor intensity, fast progress, and easy integration with upper and lower structural layers. However, wet operations must be carried out and the technical requirements are high. When using polystyrene board as the heat insulation layer, because the base layer is difficult to be flattened, the leveling layer and the heat insulation layer should generally be done first, but the construction is more flexible.
V. Economy Due to the fact that the main material of foamed cement is cement, and there are basically no wastes, multiple processes such as screeding can be omitted, and the overall cost is relatively low. The benzene board construction process is relatively complicated and there are corner wastes, so it is not economical.
From this point of view, the floor heating structure layers of different insulation layers, which ones are heavier, or which ones are thicker, cannot be concluded simply by the weight and thickness of the insulation layer, but must be ensured in terms of insulation performance and function. Under the premise of comprehensive judgment. Through comprehensive judgment, the use of foamed cement as the thermal insulation layer can make the thickness of the floor heating layer thinner than that of the polystyrene board as the thermal insulation layer, and the load is also lighter.
The premise of the above discussion is that the foamed cement must be a qualified product, that is to meet the basic physical performance index of dry bulk density ≤ 400kg/m3, compressive strength ≥ 0.4MPa, and thermal conductivity ≤ 0.09W/mK. However, due to the fact that foamed cement is cast on site, it is difficult to ensure product quality due to various factors such as equipment, process, and technical level. Low-quality foamed cement insulation is also common in engineering. This is also one of the important reasons that affect the popularization and application of foamed cement.
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