[papercreters] Rice Husk Ash

 Dear Wayne,
Rice Husk Ash is special because it almost entirely consists of silica and is a water repellent, in addition to being pozollonic.
Must other orgainc ash come no where close to rice husk ash in terms of silical content.
The closet approximation ( hich is also far way) is Sugar cane Ash ( also called baggase Ash)

Ashok

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Re: [papercreters] Re: What is it that shrinks in papercrete?

CSA cements are low shrinkage compared to portland and have a lower carbon footprint. Another plus is CSA cements bond really well to organic fibers. They are also shipped around more than mag phos cements. You can even find CSA cements at HD, bagged under the rapid set brand. Youve got to get the purple rapid set bags to be getting CSA's. Make sure you pick up some retarder while your there, it can go off quick without it. A lot of hardy board products are cellulose and CSA blends. Another brand is Ultimax Cements out of California. --- On Sat, 2/26/11, eo greensticks <eogreensticks@gmail.com> wrote: From: eo greensticks <eogreensticks@gmail.com> Subject: Re: [papercreters] Re: What is it that shrinks in papercrete? To: papercreters@yahoogroups.com Date: Saturday, February 26, 2011, 10:12 PM   fly ash is used in ceramicrete (magnesium concrete) flyash is byproduct from burning coal-here in Tasmania, coal is mined but exported so fly ash (along with rice hull ash) is not available-what about wood ash,would that work? i think magnesium cement would be good in papercretf as the mag cement is keen to bond with fibre where portland apparently actually repels fibre. knowing that, i can't figure why my experiments with paper, sawdust and cloth using portland have worked so well?there is a whole world of concrete chemistry to know... On 2/26/11, Wayne <huon@intas.net.au> wrote: > Seems a great idea Dan. > > Can any sort of ash be used or does it have to be rice hull? Rice is not > grown here but I have access to other organic wastes such as trees. > > Wayne > > > >> 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 > > >

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Re: [papercreters] Re: What is it that shrinks in papercrete?

fly ash is used in ceramicrete (magnesium concrete) flyash is
byproduct from burning coal-here in Tasmania, coal is mined but
exported so fly ash (along with rice hull ash) is not available-what
about wood ash,would that work? i think magnesium cement would be good
in papercretf as the mag cement is keen to bond with fibre where
portland apparently actually repels fibre. knowing that, i can't
figure why my experiments with paper, sawdust and cloth using portland
have worked so well?there is a whole world of concrete chemistry to
know...

On 2/26/11, Wayne <huon@intas.net.au> wrote:
> Seems a great idea Dan.
>
> Can any sort of ash be used or does it have to be rice hull? Rice is not
> grown here but I have access to other organic wastes such as trees.
>
> Wayne
>
>
>
>> 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
>
>
>

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Re: [papercreters] Re: What is it that shrinks in papercrete?

Seems a great idea Dan.

Can any sort of ash be used or does it have to be rice hull? Rice is not
grown here but I have access to other organic wastes such as trees.

Wayne

> 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

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[papercreters] Re: What is it that shrinks in papercrete?

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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[papercreters] Re: my first posting

Dan,

Good eye. You are correct. 100 pnds of other ingredients would only use a 1/2 pound of boric acid to be at 1/2%.

Gary

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[papercreters] Re: my first posting

You wrote: "I suspect the concentration is about 1/2% by weight. So 100 pounds of cellulose fiber insulation may contain about 5 pounds of boric acid."

1/2% of 100 pounds is 1/2 pound, not 5 pounds.

Dan

--- In papercreters@yahoogroups.com, "Gary Olsen" <gobug@...> wrote:
>
> Boric acid is a stomach poison to some bugs. That is pure boric acid. It is also the active ingredient in many baits, but then it is only about 1/2% active ingredient. Either the insects that eat it or the ones that clean it off themselves die from stomach poisoning.
>
> As a wood preservative it is formulated with propylene glycol and absorbed by capillary action through the wood. In this formulation, it is not a bait. Termites do not carry home boric acid treated wood and poison their colony. As applied, it is a repellent. The termites just stay away. I believe the cellulose fiber is similar. It prevents fungi and rodents as well in that application.
>
> Ant baits are different than termite baits. There are many baits on the market which use other pesticides. A bait is carried home and shared with the rest of the colony. Termite baits are not boric acid (at least not while I was exterminating). Termite baits rely on the product being carried back to the colony and shared. Boric acid doesn't seem to work that way with the termites.
>
> Since cellulose fiber insulation is not usually in the part of the structure which the termites attack (like the foundation base plate), and that it professes no mold or fungi or mice, I suspect the concentration is about 1/2% by weight. So 100 pounds of cellulose fiber insulation may contain about 5 pounds of boric acid.
>
> Since papercrete is pulverized cellulose, I don't think the polyethylene glycol would be needed. I also do not know if the alkalai action of the cement has any impact on the boric acid. I suppose the truth would take some testing to confirm.
> Gary
>

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