In aerated concrete, aluminium powder is used, which reacts with water and Ca(OH)2 to form H2 bubbles in the blend. You may also use a volatile organic solvent which will boil when concrete will become warm because of the chemical reactions. However, aggregates are not recommended as they may prevent the expansion. If aggregates have to used, you might mix the liquid blend with expanded polystyrene waste particles for example, or with any porous (but still strong) material. Cellular concrete powder might be another option.
Alain
You can try Sapindus rarak fruits. It works very well and very stable in aerating concrete. The detail information is at this link: http://en.wikipedia.org/wiki/Sapindus_rarak
Januarti
Any idea about how can I reach/buy some sapindus rarak seeds, since it does not exist here in Brazil and I want to plant some seedlings for some future experiments. Regards.
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