Slurry Guy was making hollow pc cylinders and using some procedure that involved melting ice inside them. He would be able to give details but hasn't been around lately. A search of the archives would probably turn up the information. He has other fires to put out right now. He said his results showed more R factor with compressed pc than with non-compressed, which seems counter intuitive to me. I have not done any testing so can't dispute his results.
That test page came to me back in 2002 or so, and that was all the information I got. The newsletter that it originally came from is no longer in existence and tracking down the parties involved was impossible for me. After ten years the trail is very cold. They never did get the pc to fail, it just compressed and then re-expanded after the pressure was removed. Nothing like concrete which shatters when you exceed the strength.
Considering that 12" thick walls are common with pc, 200 psi would support over a ton per running inch. Even a papercrete roof isn't going to weigh that much. PC for fill only has to support itself, strength needed is minimal. I read somewhere that Mike McCain got pc approved as adobe in NM by using magazines which have a clay coating on the pages. The NM code specifies clay but does not define how much. They test adobe for compressive strength and the number of cracks. PC passed with no problem.
Adobe houses and missions have stood for centuries, and papercrete is superior to adobe in many ways.
spaceman
Jim Elbrecht wrote:
Spaceman wrote:Cylinder break tests are for concrete. Pc isn't concrete, it is more like a wood product. http://starship-enterprises.net/files/papercrete%20strength%20tests.jpg shows strength tests done at NMSU. http://starship-enterprises.net/files/papercrete%20formulas.jpg gives formulas from back in the dark ages, party like it's 1999.Both good reading. PC is *way* softer than I expected. Softer than most woods used in construction. 260psi is softer than basswood. [and concrete used in footings is abt 5000psi, if I recall correctly] They don't say on that page how long they cured the samples. [or am I missing that?] 1 week, 1 month, and 1 year samples would be interesting. So what would be a good test to see if a particular PC mix was good enough-- for walls or fill? And is there a good way to test R-value? Heat sink value? Jim ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/papercreters/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/papercreters/join (Yahoo! ID required) <*> To change settings via email: mailto:papercreters-digest@yahoogroups.com mailto:papercreters-fullfeatured@yahoogroups.com <*> To unsubscribe from this group, send an email to: papercreters-unsubscribe@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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