Method for the production of cellular concrete and foamed concrete, and system for carrying out the method

Method for hydrothermal production of cellular concrete molded bodies or foamed concrete molded bodies of standardized quality classes, having raw densities ≦450, particularly 400 kg/m3, comprising the combination of the following characteristics:

• A lime formulation that is cement-free and sulfate-carrier-free, and, in particular, also sulfate-free, composed of at least one CaO component that is capable of reaction in a hydrothermal process, composed of quicklime, particularly white fine lime and/or hydraulic lime or their hydrates, and at least one SiO2 component that is capable of reaction in a hydrothermal process, particularly in the form of ground quartz sand having grain sizes up to 0.13 mm, as well as a propellant, in the form of aluminum powder or aluminum paste, or pre-finished foam, is produced, whereby the composition of the formulation is selected in such a manner that raw densities of autoclaved cellular concrete or foamed concrete bodies ≦450 can be guaranteed,
• the formulation components are placed into a mixer and mixed with water to produce a pourable mass, whereby in the case of the addition of quicklime the lime quenches to form lime hydrate,
• the water-containing mass is filled into a large-volume, rectangular casting mold that has a bottom and removable side and face walls, as well as a block-shaped interior,
• in the casting mold, the mass is brought to pore-forming foaming and solidification in the production of cellular concrete, or to solidification in the production of foamed concrete, to form a green, self-supporting and cut-stable concrete cake,
• the casting mold is tipped by 90°, onto one of its side walls, and the cake is unmolded by removing the bottom, the face walls, and the other side wall,
• the cake, standing long side up on one of its narrow sides, is cut in a sawing station, to produce at least one molded body by means of horizontal and vertical cuts,
• a hardening bottom, particularly a hardening rack, that stands long side up is set onto one broad side of the cut cake, and the hardening bottom, together with cake and casting mold side wall, is tipped by 90°, onto its broad side, by a tipping device, so that the cake comes to lie on the hardening bottom with its broad side,
• the casting mold side wall is removed, and the hardening bottom with the cut concrete cake is placed into an autoclave and the concrete cake is autoclaved in it,
• after autoclaving, the hydrothermally hardened concrete material is removed from the autoclave.