Tasha using asphalt emulation AE- (Henry's 107 and other roof tar, basement waterproofing, road asphalt mixes) have been used extensively in many ways. An inventor/house builder in the 1930s used it to mix with ground cardboard and cement/clay ( sound familiar?) to create Rub-R-Slateand you just add some to a DRAINED PC mixuse in dry weather, and as the clay-AE -water mix evaporates it seals up to make a strong water resistant, even water proof covering. It is NON toxic.this is asphalt, not asbestos, which people mix up standard black roofing paper is paper coated with AE used in house wrap, it's a long term use material. I'm not sure about refractory cement. I think the clay content and type is what allows it to be used in a fireplace, or high temperature variable space.
Heavy metals, if in the flyash would be bound up in the cured mix, wouldn't they? Isn't the risk with heavy metals getting them into your body? I recall a recent patent for a very porous non-alkali cement filter that allowed 3 strains of bacteria to live in the cement after cure. It purified contaminated water making a brackish pond clear in a short time.
Papercrete is a building material composed of “re-pulped” paper fiber with clay or Portland cement, or other soil added. The material was first patented during the 1920s and experienced a revival during the late 1980s. Many preppers disagree on the environmentally friendly nature of paper concrete.
The cement was not Portland but a geopolymer cement (not affordable for me). There are 2 types of flyash C & F.
I have played with both. Everything has a toxicity, especially nothing. It is just a measure, like temperature. Water, air, lettuce, aspirin, radon. Everything has a toxicity number.
'Fairly' is a word like 'very'. It is gut feel and has no quantification. Since flyash is the byproduct of burning coal for energy, the toxicity is not created by using it in a concrete or PC mix. I don't think concrete is more toxic because flyash is added, perhaps less because less Portland is used. The environmental impact of using flyash in the mix is less than using all Portland.
Type F flyash is a bit more expensive, more pozzolonic, and harder to find than Type C. My regular cement product supplier process their own type F. I believe it is Type F from Type C. This apparently removes some of the reputed contaminants in Type C. Type F is a dark gray not the light brown like type C, hence it gives a differently colored finished product. Type C is cheaper than Portland, Type F is about the same price as Portland. I do not know how Type F is processed.
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It could be that the energy required to process it makes the environmental impact the same as using Portland. I have heard that road repairs in the cold weather areas use flyash because it lessens the risk of freeze cracking on freshly poured mixes. I notice more plasticity in the mixes I use. There are 2 types of flyash C & F. I have played with both.
Everything has a toxicity, especially nothing. It is just a measure, like temperature.
Water, air, lettuce, aspirin, radon. Everything has a toxicity number.
'Fairly' is a word like 'very'. It is gut feel and has no quantification. Since flyash is the byproduct of burning coal for energy, the toxicity is not created by using it in a concrete or PC mix. I don't think concrete is more toxic because flyash is added, perhaps less because less Portland is used. The environmental impact of using flyash in the mix is less than using all Portland.
Type F flyash is a bit more expensive, more pozzolonic, and harder to find than Type C. My regular cement product supplier process their own type F. I believe it is Type F from Type C. This apparently removes some of the reputed contaminants in Type C. Type F is a dark gray not the light brown like type C, hence it gives a differently colored finished product. Type C is cheaper than Portland, Type F is about the same price as Portland. I do not know how Type F is processed.
It could be that the energy required to process it makes the environmental impact the same as using Portland. I have heard that road repairs in the cold weather areas use flyash because it lessens the risk of freeze cracking on freshly poured mixes.
I notice more plasticity in the mixes I use. Fly ash (at least the ones I have heard of having positive effects) are pozzolanic, unlike wood ash. Wood ash would simply be another filler, like paper but without the higher air entrainment properties of paper pulp. Obviously, YMMV and feel free to test things out and let us know if you find differently.
E - In [email protected], wrote: So this might seem like a silly question but would you all think that fine screened ashes from burned fire wood would also serve in a similar way as coal fly ash?? Fly ash (at least the ones I have heard of having positive effects) are pozzolanic, unlike wood ash. Wood ash would simply be another filler, like paper but without the higher air entrainment properties of paper pulp.
Obviously, YMMV and feel free to test things out and let us know if you find differently. E - In, wrote: So this might seem like a silly question but would you all think that fine screened ashes from burned fire wood would also serve in a similar way as coal fly ash?? Jackie - Yahoo Groups Links To visit your group on the web, go to: Your email settings: Individual Email Traditional To change settings online go to: (Yahoo!
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ID required) To change settings via email: To unsubscribe from this group, send an email to: Your use of Yahoo Groups is subject to. AIR entrainment is what will give the R value,sand and heavy additives will just offer mass.there is a trade off of 2' thick clay/adobe wall that soaks up sun, vs a 40' straw bale that keeps warmth in and cold out at R 50 both opposites. The best of both is a fluffy papercrete very thick, but lightweight, where as water evaporates air pockets remain. In the cement/concrete world adding the flyash and other air entrainment liquids ( to cause bubblers) lighten the cement and insulate better, again they seek the best of both. I'd research how the cement/concrete makers do this for real info, as the PC world is all individual experiments without the serious, rigorous testing. I've seen several articles on this type of insulating research online. SCRIBD is the best site- many many free books- ON ANY TOPIC- amazing- I put up my own writing- they pester you until you contribute YOUR works.
GO TO search by key word- they want you to upload your own writing- anything is acceptable that is useful- maybe write up your experience on building something- or what you know? But it will annoy you until you do donate something.
But you can get them books and info free, so it is worth it. BOOKS AT SCRIBD I HAVE FOUND: USE THE 7 OR 8 DIGIT CODE IN THE 'SEARCH' BOX TO FIND THESE TITLES: (MANY of the following titles are ALREADY on my CD GUIDES, or ONLINE via Papercrete.com). 22297131-Organic-Additives-to-Clay.pdf 22297251-Clay-Tile-Manufacture.pdf 20140092-The-Ecology-of-Building-Materials.pdf 20682878-Building-Green.pdf 21813671-Taylor-Earth-Plaster-Report.pdf 17734996-Geen-Building.pdf 18664531-Papercrete.pdf. The additive that is put in papercrete to replace part of the cement is fly ash. It is so fine that it acts as a pozallan - an additive to cement that makes the cement more pliable and easier to spread. The main reason is to reduce costs. I think we are confusing two groups of very different waste products.
Both clinker and fly ash are byproducts of coal combustion, but there the similarity ends. Clinker ranges in size from that of a garden pea to chunks two feet long or more. Fly ash is so small that it flies up the smokestack. I believe the clinker acts like an aggregate in the usual cinder block. The fly ash actually acts as a binder, like cement but not as strong. The lucky happenstance is that up to 50% of the cement in a concrete mix can be replaced by fly ash without reducing the strength of the concrete. While cement is inexpensive, fly ash is even cheaper.
Wood ash and rice hull ash are both the result of combustion of organic material. Rice hulls are unique chemically and physically. So we cannot assume the wood ash will have similar properties to rice hull ash. You have an idea that is worth testing. I believe that you cannot assume wood ash will have equal proprieties to rice hull ash. I feel you should test and compare wood ash modified papercrete to 'normal' papercrete and urge you not to use it for buildings for humans until you have tested it.
Cinder Block was properly called cinder block. For example, We used to have a coal fired power plant here in town so they had coal cinders. The Concrete Service is the company here that has been making blocks for a very long time.
Back when they had free coal cinders they also made a line of lighter Cinder Blocks. They are a much darker gray color and weigh less. Anyone that looks at them should know the difference. Still way too many people even in books and on television are calling cement blocks by the wrong name. Alan in Michigan.