Manufacture of autoclaved aerated concrete (AAC) with Vario Block and Vario Panel method
Aerated concrete is made of the raw materials silica sand, lime, cement and gypsum (anhydrite).
First, the silica sand is ground to fine dispersed sand slurry and then stored in slurry silos with integrated stirring devices.
Sand slurry, return slurry made of cutting waste, lime, cement, gypsum, aluminium dispersion (made of water and aluminium powder or paste) and water are automatically or semi-automatically dosed into the mixer according to variable mixing recipes.
When the mixing process is completed, the mixture is filled into the ready mould immediately. The mixer is filled anew for each casting cycle. After the moulds have been transported to the fermentation area, the mixture starts to react and generates the typical air voids.
As soon as the cake is stiff enough to be cut, the blocks are demoulded and positioned on the cutting line. In the cutting line, the blocks are profiled first, then cut vertically and horizontally. The blocks receive their final strength by means of hardening under steam pressure in the autoclaves.
After the hardening process, the blocks are prepared for transport by means of cubing - in most cases on wooden pallets - and shrink-wrapping.
