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Equipment for manufacturing of foamed concrete
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Aerated concrete

Aerated concrete is blown-out concrete. It is a solid surfacing with spherical pores which are uniformly distributed. Aerated concrete consists of mixture of binding, silicic component and water. Porous structure is provided with introduction of gas forming and modifying agents.

Binder:

- Portland cement and lime (gas silicate).

- Portland cement (non-autoclave aerated concrete).

Silicic component:

- Fly ash from thermal power plants, granulated furnace slag, silica sand.

Gas forming agent:

- Aluminum powder. In the process of powder introduction into mixture chemical reaction starts, and as a result hydrogen is released and forms pores.

Modifying agents:

- Hardeners, plasticizers, structure formation agents.

Aerated concrete can be classified by the following features:

1. By designation:

- structural;

- structural and insulating;

- insulating.

2. By hardening condition:

- autoclave (synthesis hardening) — hardens in saturated vapor medium at superatmospheric pressure;

- non-autoclave (hydration hardening) — hardens naturally, at electric curing or in saturated vapor medium at superatmospheric pressure.

3. By binder type:

- on lime binders;

- on cement binders;

- on compound binders;

- on slag binders;

- on ash binders.

4. By variety of silicic component:

- on natural materials — floured silica sand;

- on secondary outputs — ash from thermal power plants and ore processing afterproducts.