2. Composition of aerated concrete

This autoclaved silicocalcareous material is suitable for densities ranging from 100 to 800 kg/m ³ . Current construction applications, depending on the physical and mechanical performance required, use cellular concretes with densities ranging from 350 to 550 kg/m ³ . Thus, 1 m ³ of raw materials is needed to produce 5 m ³ of cellular concrete, i.e. a material made up of ∼ 80% air. This volume of air takes the form of a set of cells (micro-cells and macro-cells) uniformly distributed throughout the material (figure 1 ), which gives the material its thermal characteristics.