Thanks Travis, although after looking around a bit, thanks to your suggestion, it seems that earthcrete is a bit different from Tataki; Earthcrete uses portland cement to stabilise the earth.
Whereas Tataki consists of three ingredients: Earth (usually sandy, but i'm trying with silt), Lime & Calcium Chloride (or bittern).
Anyway we're knocking it out today and i've got my permie students here in China slaving away, so fingers crossed it works out ok.
