I always understood that the lime was an important preservative element in papercrete, preventing the paper being consumed by various plant and bacterial lifeforms. If thats correct, its best to avoid fine pozzolans. BTW another effective preservative is coarse copper powder, the amount needed is minimal.
And a plus of papercrete is that it can cope better with embedded metalwork rusting and expanding, whereas traditional concrete can't. OTOH papercrete is more porous, so rusting may be faster. A key to longevity is to design structures to survive loss of metalwork integrity.
--- In papercreters@yahoogroups.com, "Clyde T. Curry" <clydetcurry@...> wrote:
>
> the natural world is full of concretions and no they do not last forever - still those we concoct will last longer if the excess lime has been reacted with pozzolan and we leave out the steel, which rusts and then exsplodes the concrete from within. Unlike concrete papercrete is insulatory and will have saved much energy before it has to be maintained -Clyde T.
>
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