Try researching ‘cob’ building, also papercrete. The basics seem pretty universal: dirt with a heavy clay component or Portland cement or slaked lime to act as a binder, sand, and a shredded fiber to act as another type of binding agent. The main comparison between straw bale construction or adobe is that you want to let this formula breathe so it doesn’t get moldy, so go light on surface treatments if you use them at all.
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