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Do you know how to make foam concrete

wallpapers Industry 2020-04-09

Compared with ordinary concrete, foam concrete hydrogel is relatively large and contains a lot of air bubbles. The introduction of air bubbles makes the foam concrete have excellent properties such as lightweight, sound absorption, thermal insulation, high fluidity, etc., but also brings disadvantages, that is, the foam concrete has a low strength. But its low price still makes foam concrete widely used Performance characteristics of foam concrete.

(1) Lightweight

The density of foam concrete is only 1/3 ~ 1/10 of that of clay brick, which is only

1/5 ~ 1/10 of its density, the use of foamed concrete in the interior and exterior walls, floors, floors, columns, and other parts of the building can reduce the building's own weight by 25% to 40%. In addition, for structural members, the use of foam concrete can improve the bearing capacity of the members. Therefore, the proper use of foam concrete in construction projects can not only ensure the durability and structural load-bearing performance of the building but also greatly reduce the cost of the project.

(2) Good thermal insulation performance

The interior of the foam concrete is filled with a large number of uniform, small, and closed spherical pores. Its thermal conductivity is very low, and it has thermal insulation performance that ordinary concrete does not have.

(3) Sound insulation

There are a large number of closed pores inside the foam concrete, which has a certain sound insulation performance and can be widely used as a sound insulation layer in building floors, highway sound insulation boards, and top floors of underground buildings.

(4) Fire resistance

Foam concrete has non-combustible and good fire resistance. A large number of studies at home and abroad have shown that the foam concrete with a density in the range of 500kg / m2 ~ 900kg / m3 has a fire-resistance limit of 2.7 hours, which is a kind of inexpensive refractory material.

(5) Good shock resistance

According to the principle of vibration, the absorption of impact energy by a building structure increases with the length of the self-seismic cycle. Foam concrete has low density, lightweight, and low elastic modulus. When an earthquake occurs, the seismic force of the foam concrete is small, and the transmission speed of the shock wave is also slow, so it has a good shock absorption effect. The rational application of foam concrete to specific parts of construction projects can effectively increase the seismic performance of buildings and enhance the safety and firmness of buildings when earthquakes occur.

Raw materials and preparation method of foam concrete

The raw materials for the preparation of foam concrete are from a wide range of sources, mainly cement, water, and foaming agents. Sometimes fillers, fine aggregates, and admixtures are added to reduce costs on the one hand and improve the performance of foam concrete products on the other. Commonly used fillers include sand, fly ash, ceramsite, crushed stone chips, polystyrene particles, expanded perlite, etc .; commonly used additives are: water reducing agent, accelerator, quick-setting agent, early strength agent, Foam stabilizer, etc.

Preparation method of foam concrete

The preparation methods of foam concrete are mainly the following two: one method is the pre-foam mixing method, which is to prepare the foam first and then mix the prepared foam with the mortar. The experimental steps are: first preparing cement mortar, then preparing foam, and finally mixing, pouring and curing the mortar and foam. Another method is the mixing method; that is, the mixing of concrete and foaming is carried out simultaneously. The specific steps are as follows: preparation of foaming agent cement mortar, precasting of the prepared mortar, and static foaming of the green body after pouring. The biggest difference between the above two preparation processes is: the prefabricated foam mixing method is to prepare bubbles in advance and then mix it with the mortar; while the mixing and stirring method are to first prepare the mortar containing the foaming agent, then precast and then cast, the last step is to stop at rest. The foaming is completed during the process. Different processes have different properties and the use of foam concrete. Generally speaking, the foam concrete mortar prepared by the prefabricated foam mixing method can be transported in a long distance because of its good flow properties, while the foam concrete mortar prepared by the mixing method cannot be used for transportation and on-site pouring.

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