If a conex container is buried in expansive soil, I'd imagine the forces on the side walls would be tremendous, like being squeezed in a vice. The top not so much?
Potters have been mass-producing clay for millennia. I remember the big mixers from when I took ceramics in college. They fine tune the mixture for various uses.
That why I think varied pozzolan
vs fly-ash in aircrete should be tested.
For building on expansive soils how about pilings. I like the
Foundation Frame. It's a hybrid pier block/piling.
https://i.pinimg.com/originals/b5/c7...5056ed12ac.png
Quote:
How much foam would it take to protect a steel container dome from dirt? 
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Fixed it for you.
Slabs of foam will resist compression much more than bending.