I know Paul Wheaton (from permies.com and richsoil.com) this is a great idea when using cob, but bad idea for papercrete. It won't get thermal mass. You will burn the wood or whatever you put in there more efficiently but you won't get the heat you want. Also I would venture to guess that the paper fibers themselves might gassify with all that heat, and not sure what that would do internally to the cement (i.e. de-bond the cement?)
I've been looking at the following site http://www.richsoil.com/rocket-stove-mass-heater.jsp and others, and was wondering if instead of cob for thermal mass, if papercrete could be used instead. Has anybody else thought of this or tried it?
Bob
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