Other applications of cement polystyrene board
DATE：2021/11/30 9:19:12 / READ： / SOURCE：This station
Other applications of cement polystyrene board
(1) Cement polystyrene board Cement polystyrene foam board is a granule made of polystyrene foam scraps or waste polystyrene foam after crushing, adding cement, water, EC foaming agent and foam stabilizer And other materials, a new type of heat preservation and heat insulation material made by mixing, forming and curing. This material introduces a large number of bubbles into the cement slurry through a foaming agent, etc. These foams are wrapped in the cement slurry, which can not only completely wrap the polystyrene foam particles, but also fill the gaps between the particles to form the unique interior of the cement polystyrene board. structure type. It has the advantages of light weight, low thermal conductivity, good thermal insulation performance, certain strength and toughness, water resistance, flame resistance, convenient construction, firm bonding, and low price. It is suitable for thermal insulation of building exterior walls and roofs. Floor.
The development of cement polystyrene board has opened up a new way for the recycling and reuse of waste polystyrene foam, which is conducive to environmental protection and eliminates "white garbage" in the city. It is very beneficial to the development of polystyrene foam.
The density, strength and thermal conductivity of the cement polystyrene board restrict each other. As the density of the board increases, the strength increases, and the thermal conductivity also increases, and the insulation performance decreases; on the contrary, the density decreases, the insulation performance increases, and the strength decreases. The relationship between the density of the cement polystyrene board and the compressive strength and thermal conductivity is shown in Table 4-28 and Table 4-29
In the production process, changes in the composition of the composition have a significant impact on the properties of the board. The factors affecting the performance of cement polystyrene board include cement dosage, cement strength, water-cement ratio, foaming agent, water reducing agent, particle size of broken polystyrene foam, and fly ash amount. Some methods to improve the performance of cement polystyrene boards are as follows.
① Properly increasing the amount of cement can increase the strength of the cement polystyrene board, but at the same time increase the density of the cement polystyrene board. Under the premise of stricter density requirements, it can be solved by increasing the strength of cement.
② Adding an appropriate amount of foaming agent can not only effectively increase the strength of the cement polystyrene board, but also reduce the density, which is a priority factor.
③Admixing an appropriate amount of alkaline water agent can reduce the mixing water consumption, and increase the density of the cement paste under the premise of ensuring the compatibility of the mixing materials, thereby increasing the strength of the cement polystyrene board.
④Using appropriate amount of fly ash can save the amount of cement and achieve the purpose of reducing costs under the premise of basically ensuring the performance of the cement polystyrene board.
Increasing the particle size of the broken polystyrene foam will reduce the strength of the cement polystyrene board. Generally, the particle size is controlled in the range of 1-10mm, the average particle size is about 5mm or less, and the bulk density is 12.8kg/m3
Author：admin