2022.04.20
In the building materials industry, thermal insulation materials and load-bearing materials are often separated in function, and appropriate composites are carried out on building components. Such as EPS lightweight concrete, cement polystyrene board, EPS foam hollow brick and EPS lightweight roof insulation board, etc., which are characterized by making full use of the excellent thermal insulation performance of EPS foam machinery. After the waste foam machinery is pulverized and heated by infrared radiation, its volume is reduced to less than 1/20; then it is mixed with special cement to make a popcorn-shaped building material, which is recognized as a non-combustible building material. The sound-absorbing effect of this building material is an average of 60%, and the noise suppression for certain frequencies can reach more than 90%. This material is now used for walls and ceilings of various soundproofing facilities.
In addition, EPS crushed materials can also be made into lightweight blocks, thermal insulation mortar for internal and external walls, and lightweight mortar. It is also possible to mix the colloidal clay and the EPS crushed material in a certain ratio, calcined at high temperature, and the EPS crushed material is sintered to make a clay brick with a hollow structure, which has high strength and excellent thermal insulation performance. .
1. Making lightweight concrete
EPS lightweight concrete is a kind of mineral cemented concrete (foamed concrete) that uses EPS crushed material as concrete aggregate. . It is produced from a porous aggregate with very low particle strength. Determining the strength properties is the cement stone structure, which wraps the EPS aggregate and affects the density of the concrete. Likewise, the particle shape, particle size and the applied The surface properties of EPS aggregates are also important. In contrast to mineral aggregates, EPS aggregates are not measured by weight, but by volume. It is thus possible to precisely determine the pore volume and the density of the concrete, producing a deformable porous concrete with a closed-cell structure. The material properties can be adapted to its requirements through the choice of concrete density, which enables the best combination of load-bearing, sound insulation, thermal insulation and fire protection properties.
For the characteristics of EPS lightweight concrete, it is very important to occupy a high proportion of EPS particles by volume. When the density is below 600kg/m3, the amount of cement mortar is insufficient. If no admixture is added, EPS lightweight concrete is here. Within the density range, due to the obvious rolling characteristics, it is difficult to process and compact, and increasing the amount of water will reduce the strength and promote shrinkage and segregation tendencies. For this reason, air-entraining, stable and water-reducing additives should be added. .
2. Making cement polystyrene board
Cement polystyrene board is a new type of thermal insulation board made of EPS crushed material, cement, foaming agent and other materials after stirring, forming and curing. It is light in weight, good in thermal insulation performance, has a certain strength, and is simple in construction. It is suitable for internal thermal insulation, external thermal insulation and roof thermal insulation of brick walls and concrete walls. This kind of board is suitable for wall insulation of civil buildings and roof insulation of industrial buildings. It can fully meet the requirements of “Civil Building Energy Conservation Design Standard” (heating and residential part) for thermal insulation in cold areas. It is a new material for building energy conservation.
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