Foam concrete is made as follows. The aluminum powder playing the role of a gas former is introduced into the mixture, which consists of binder, quartz ground and adding water. As a result of the chemical reaction between aluminum and calcium oxide hydrate, gas formation process occurs. The arising hydrogen emerges the solution. When it hardens, the porous structure is preserved. So that the material is quickly hardened and becomes quite durable, it is processed in autoclaves with warm steam at a pressure of 9 atmospheres. Air temperature in the autoclave should be 175 ° C.
