Cob & Plaster Mixes... with Diatomaceous Earth?

Has anyone experimented and/or had any luck with trying to mix Diatomaceous Earth into their cob or plaster mix for a structure (same for earth cement/flooring)? The thought simply being that if the structure itself has a decent ratio (without overwhelming the building components, of course), it would make the structure pest-free by default. Or am I staring into a pipe dream?

(Re-post from DE Thread)