Check out the following links, for example.
It seems that rice hull *ash* is usually used as an additive to concrete, similar to and possibly better than pozzolan.
Perhaps you could use both rice hulls and rice hull ash in your mix, getting twice the bang for your buck.
Dan
http://finance.dir.groups.yahoo.com/group/cheap-shelters/message/8836
http://www.voanews.com/learningenglish/home/agriculture/a-23-2009-11-30-voa2-83140747.html
ftp://66.151.101.167/woc/J970499.PDF
Re: What is it that shrinks in papercrete?
Posted by: "karl88" indiakarl@yahoo.com indiakarl
Thu Feb 24, 2011 6:25 am (PST)
best way to find out about any of those add-ins is to test them out! papercrete itself came about because someone thought "hey, i wonder if i could substitute paper pulp for sand and rocks in concrete." try some of them ideas out and let us know what works.
my home is in Thailand. i can get bags of rice hulls for a few cents. i tried making hyper-tufa with them - because the usual other ingredients: peat moss and perlite/vermiculite are not available there... i asked everywhere in the area. what i didn't try was soaking the rice-hulls in water to soften them before adding cement. that mighta worked better, and i'll try it next time i'm home.
go for it!
> --- In papercreters@yahoogroups.com, "foodforestdude" <steven.ivy@> wrote:
> >
> > I was just wondering what is it exactly that causes the shrinkage we see in so many mixes of PC?
> >
> > Is ir as I assume, the paper cellulose fibers?
> >
> > So even if it means not using paper, what other admixtures could be added to decrease the shrinking problem and not give up the nice tensile and insulation properties?
> >
> > Some substances I have considered as "papercrete" ad-mixtures...
> >
> > Sawdust, Lawn grass clippings, ground and sifted dried leaves, Pulverized bamboo, Vertiver grass (long, medium, and, or short fiber versions),
> > Shredded plastic bottles, broken glass bottles (may want to polish this material for beauty), Shredded plastic shopping bags, Shredded up old carpet, Shredded up old clothing, shredded old rubber tires, Mulched tree bark and or twigs, wheat straw, shredded scrap wood from regular construction, pine needles, Shredded old tar roof waste, rice hulls, peanut hulls, some sort of a human healthy dried fungus...
> >
> > So what do you think? Any of that worth a shot?
> >
>
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