1 Definition of building self-insulated block
Its own thermal insulation function, do not need to do thermal insulation treatment can meet the regional building thermal insulation energy saving standards, but also has the structure of the block is called the building self thermal insulation block.Building self-thermal insulation block is a new type of wall material integrating structure and thermal insulation. It has the advantages of low thermal conductivity, light weight, high strength, good fire and sound insulation performance, as well as the functions of structural materials and thermal insulation materials. It also has the advantages of reducing construction cost, convenient construction, convenient maintenance and reconstruction.For the construction sector to reduce energy consumption, reduce environmental pollution have a positive role in promoting.
Main factors affecting the thermal insulation performance of building self-insulated block and improvement measures
In order to meet the requirements of building energy conservation standards in different climate areas, corresponding technical measures can be adopted to improve the thermal performance of ordinary building self-insulated blocks, so that the ordinary blocks can be transformed from a single structural material into a self-insulated block with integrated structure and energy conservation.
At present, the main measures to improve the thermal performance of ordinary building self-insulation block are as follows:
1) Increase the width (thickness) value of the self-insulated block.According to the principle of heat transfer, the thermal resistance of block is related to the thickness of block. The thicker the thickness is, the higher the thermal resistance value will be, the smaller the thermal conductivity will be, and the better the thermal insulation performance will be.Therefore, when the self-insulated block is prepared, its thickness can be appropriately increased under the condition that the bulk density of the self-insulated block is roughly unchanged, so that the thermal resistance value of the self-insulated block can be effectively improved.
2) Add lightweight aggregate to the block base material.The thermal insulation performance of the self-insulated block is inseparable from the performance of the block substrate. Research data show that when the number of holes of the self-insulated block is the same, the higher the thermal resistance of the substrate, the lower the thermal conductivity of the block will be.Therefore, can be in since the insulation block strength and other performance index requirements under the condition of using lytag, light aggregate such as shale ceramsite, coal gangue, and construction waste recycled aggregates such as partly replacing or completely replace the base material in the aggregate, in order to improve the heat resistance insulation block, and effectively improve the heat preservation and heat insulation performance.
3) Adopt "multi-row thin hole wall" design.For hollow since the insulation block by a single material preparation, the hollow part of the formation of the air layer thicknesses, block heat resistance difference also produces change, its change rule is as air layer thickness increases, the thermal insulation block heat resistance increases gradually, after (usually about 40 mm), since the block of the thermal resistance is no longer a significant fluctuations.However, many studies have shown that when the number of rows of self-insulated block holes increases, the thermal resistance of blocks will be improved to a large extent.Therefore, for blocks of a certain thickness, in order to significantly improve its thermal performance, the "multi-row thin hole wall" design should be adopted.
4) Fill in efficient insulation material.In order to meet the requirements of current building energy conservation standards, the thermal resistance value of self-insulated blocks can be significantly improved by filling the holes of self-insulated blocks with thermal insulation materials with excellent performance.At present, the thermal insulation materials used to fill the self-insulation block mainly include EPS thermal insulation board, XPS thermal insulation board, cement polystyrene particle size, foamed polyurethane, foamed concrete, glass wool, etc.
Injection molding is the best way to fill thermal insulation materials in block holes.EPS thermal insulation material, XPS insulation materials, foaming polyurethane such as high efficiency heat preservation material by injection molding process into the building block of the holes, and fill in the interpolation process were compared to the building since the insulation block, insulation materials combined with block skeleton closer, integrity, and can be more effective to reduce heat loss, improve the thermal insulation performance of the heat insulation block, at the same time, improve the overall strength of block.