I have been doing some work trying to replicate Recipe #34 and have had considerable success. My interest in this realm is to work out compositions of my local, backyard clay and turn it into economical, insulative refractory mixes that can be cast into shapes for cores, risers, or whatever the user can imagine. I have documented some of this work over at Permies. permies.com/t/152407/ceramic-glass-batch-box-roof
Post by Karl playing with geopolymers on Jun 10, 2021 10:41:28 GMT -8
Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a pretty good accelerator. Mixing it with very fine grog powder or other finely divided pozzolanes gives a very fast setting roman cement, which is a calcium geopolymer.
I was well on my way to experimenting with geopolymers when I stumbled upon Patent # 3,944,425 and took a detour. I had already been trying to figure out how to do the foamed clay thing and this patent provided several recipes for high temp refractories which seemed very safe, simple and straightforward. I've had some success with recipe #34, which is mostly all "Fine-Grained Brick Clay" for which I have substituted my own clay from my property. That's all documented at the Permies link. However, I do not believe I am firing this material at high enough temperatures to achieve a fully mature ceramic body. Right now I'm putting together a small foundry so I can get these small samples up to higher temps.
It's funny you mention quicklime as I had planned on making some and experimenting with it. I have access to loads of zebra mussel shells piled up on the beach from Lake Erie nearby and with the foundry, I can easily make it fresh. Do you think adding a small amount to the mix, such as 5 %, in Example #34 in the Patent would enhance setting times? My set times are much longer than what the patent suggests, but then again, I am substituting the main raw material and the cement I am using is a Calcium Aluminate, but is not the "Lumnite" cement the patent specifies.
Post by Karl playing with geopolymers on Jun 11, 2021 11:01:09 GMT -8
With the foundry you can not only make quicklime but also metaclay eg. metakaolin. With metakaolin and quicklime you have basicaly a calcium aluminium cement wich is without calcium sulfate also a calcium geopolymer. With lye or phosphoric acid you will get other kids of geopolymers. Some carbonic acids eg. citric acid will work with metaclays as well.
Different lyes or different acids can be mixed and thus become much more powerful than each alone. Qicklime is a lye as well and will shorten the setting time of other lyes significantly. carbonic acids are much better in cracking clay molecules than anorganic acids.
Heve a lot of fun.
Clay geopolymers have a high air content by nature and thus can be considered as "foamed"
Milling solid lyes or acids together with the clays will improve reativity. Respiratory protection is mandatory.
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8
belgiangulch: Photo's are possible. They must be downloaded elsewhere and the image url (adress) is copyied.
Sept 14, 2020 7:26:15 GMT -8
belgiangulch: While creating a thread click on the small picture in the banner above the reply. A box pops up, paste the image url in the box. Pay no attention to the huge list of numbers and such.When you finish and hit reply your post with pictures will come up.
Sept 14, 2020 7:29:27 GMT -8
deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post email@example.com..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8