I like the aircrete technique. I have checked the website. What surprised me are the numbers:
They say that from 90 lb bag of cement they make a volume of 40-50 Gal of aircrete. On the other hand 90 lb of cement will make exactly 36 Gal of 3000 PSI concrete, so not much less. Nonetheless I like it, because it can create beautiful structures and may reduce or eliminate formwork. Form preparation is very labor intensive, especially if the ready forms are not available for rental.
Have you checked this website?
http://www.flyingconcrete.com
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