I'd like to add that I believe a closed cell papercrete mix is possible by
removing enough water from the pulp to make a balanced water cement ratio
with the cement mortar paste that encapsulates the fibers.
Further balancing the ratio of mortar to fiber to insure full encapsulation
should achieve an extremely strong fiber reinforced mortar though no where
near as insulating as traditional papercrete.
Ideally you need to shoot for less than 40% water to cement ratio to prevent
residual water from escaping by making thousands of little capillaries that
create a porous material that will later reabsorb moisture. There are other
things that you can do like adding foamers and water reducing emulsifiers to
make a workable mix and still stay below 40% w/c (water/cement Ratio).
Janosh
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