but apparently +30% is subject to frost cracking, hich might be a problem in earthbags, which is what ive been planning to build with. but if i have to end up mixing sand into every bit of dirt i fill the bags with, it loses its time-economical edge over plain cob.
i have a lot of clay. my jar test has been in suspension for 2 weeks, untouched for 10 days - no sand/silt lines. at all.
we'll see, we'll see.