I have used cellulose in a papercrete project. Mixed 2:1:1:1 cell to crete, lime and sand. Purpose was a floated subfloor for a tile patio floor. It has worked great in that application. I tried a few test blocks with left over material and it is not suitable in my mind as a block. Its too easy to chip/crack. It also never quite feels dry in that application as well.
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