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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