With high alumina clays for geopolymerization, one will always be on the safe side. One could "Bet the Farm" on virtually any geopolymer made from high alumina materials.
By the way, has anyone heard from karl lately??
Karl was ill for a couple of weeks, but has posted on the forum in the last few days, and let me know via PM that he has received my package with the sample of SweetPDZ zeolite "horse stall freshener" for testing, within the last week.
Lets all send some healing intentions his way, as I know I, and likely others, have missed his presence and help.
I've updated my original post with the cured product volume.
The product is by far the hardest that I have tested. No crumbling around the outside like what I've seen in my other recipes. I will conduct fire and water testing somewhere around the beginning of April.
10% monopotassium phospate 4.2% Potassium hydroxide 6.56% OPC will yield about 23.6 % KAlSiO4 Kalsilite 7.7 % Ca3(PO4)2 Tricalcium phosphate
Total binding minerals 31.3%
The Molar ratio CaO/KH2PO4 is 1.5 thus the OPC can be increased by 1.5
10% monopotassium phospate 4.2% Potassium hydroxide 10% OPC will yield about 23.6 % KAlSiO4 Kalsilite 11.8 % Ca3(PO4)2 Tricalcium phosphate
Total binding minerals 35.4%
Those who want to have even cheaper mixtrures may try: light colored clay with about 27% alumina which would mainly yield leucite light colored clay with about 20.5% alumina which would mainly yield orthoclase
Does this mean that the product is roughly 23.6% geopolymer?
From Wikipedia: Definitions of the term geopolymer
'...Geopolymers consist of a polymeric Si–O–Al framework, similar to zeolites. The main difference to zeolite is geopolymers are amorphous instead of crystalline. The microstructure of geopolymers on a nanometer scale observed by TEM comprises small aluminosilicate clusters with pores dispersed within a highly porous network. The clusters sizes are between 5 and 10 nanometers.'
Post by Karl playing with geopolymers on Mar 12, 2018 9:40:34 GMT -8
It is a bit more complicated. This cheap mixture will not result in 100% reacted materials, but enough to bind the remaining Kaolinite until more of the material can sinter at high temperatures. And the geopolymeric reaction does not actualy imediately create kalsilite. The kalsilite will be created once the geopolymer starts to crystallize above 500°C / 932°F
Kalsilite ~ 1750 °C / 3182 °F Chemical Formula: KAlSiO4 Molecular Weight = 158.16 gm Potassium 24.72 % K 29.78 % K2O Aluminum 17.06 % Al 32.23 % Al2O3 Silicon 17.76 % Si 37.99 % SiO2 Oxygen 40.46 % O ______ ______ 100.00 % 100.00 % = TOTAL OXIDE
Kalsilite contains about 30% K2O
If you substract it (158.6*0.298 ~ 47.1) from the molecular weigth of 158.16 then rest is 111.5 metakaolin. Kaolinite contains about 14% water thus 111.5:0.86 ~ 129.65. Kaolin clay contains roughly 2% impurities thus 129.65:0.98 ~ 132.6. The weight ratio of 2KOH/K2O is (56.1*2)/94.2 ~ 1.2 thus 47.1*1.2 ~ 56,52 56.5 is about 42.6% of 132.6.
Fully reacted kaolin clay requires a huge lot of KOH, which makes it a lot more expensive.
A mixture of light colored clay with about 27% alumina would yield mostly leucite with 218.25 gm and thus a significantly higher percentage of reacted material, but decreased refractoriness. and a mixture with 21% alumina would yield mostly orthoclase with 278.33 gm and thus an even higher percentage of reacted material, but even more decreased refractoriness.
Note: even the 23.6% require elevated temperatures of at least 85°C/ 185°F or many weaks of ambient curing.
Ca3(PO4)2 + KAlSiO4 = Ca3(PO4)2*KAlSiO4 Ca3(PO4)2*KAlSiO4 + Ca3(PO4)2 = Ca3(PO4)2*KAlSiO4*Ca3(PO4)2 Ca3(PO4)2*KAlSiO4*Ca3(PO4)2 + KAlSiO4 = Ca3(PO4)2*KAlSiO4*Ca3(PO4)2*KAlSiO4 And so on.
Alternative notations of kalsilite KAlO2SiO2 or KAlO2*SiO2 KAlO2*SiO2 + KAlO2 = KAlO2*SiO2*KAlO2 KAlO2*SiO2*KAlO2 + SiO2 = KAlO2*SiO2*KAlO2*SiO2 KAlO2*SiO2*KAlO2*SiO2 + KAlO2 = KAlO2*SiO2*KAlO2*SiO2*KAlO2 And so on.
Each "*" marks a grain boundary.
Because this can happen in more than one dimension the result will be a three dimensional network.
I hope this makes it clear what a geopolymer is and why they have a low thermal conductivity.
This is an insulating mix so I guess it’s not very hard? Have you any experience of using it to make a dense concrete type material? Do you think it would work? Say for a weatherproof coating for a pizza oven dome?
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