when I said earthcrete, I was really thinking of soil cement/ stabilized soil...
From what I read, you're not supposed to have more than 10% clay in your soil and then you add 5 to 15% of portland cement.
I made some test block using soil from my yard wich is mostly clay. I didn't add sand and added 10% portland cement. The result is a very hard block that doesn't seem to suffer from the clay content.
I will let it dry a few days still and then will test the strenght...
Alexis
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