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Foamcrete (foam concrete, cellular foam concrete, CFC, or air-crete) was developed in the 1920's to reduce concrete weight and add insulation value by replacing sand and stone aggregate with air bubbles. There are numerous ways to do this. One method is a powered mix causing a chemical reaction in the mix to bubble up inside. Then it's placed in an oven to slowly cook off water and hardened to produce sawn AAC blocks (Autoclaved Aerated Concrete).
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The second method (the one we use) makes a soap foamed in a foam generator (to a shaving cream consistency) then mixed with the cement to form foamcrete. While not as light as AAC, foamcrete is less fragile and doesn't require huge ovens to bake the blocks.

The foam mixed with cement and it expands the volume of cement about 5 times to make another good lightweight insulation concrete. We will mix and mold various sizes of foamcrete blocks and assemble to build 15' (4.6 meter) sized (or larger) domes.