jules
New Member
Posts: 16
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Post by jules on Nov 26, 2021 22:25:27 GMT -8
Recently, I have been trying to pour smaller samples of geopolymers from locally available materials. Because I didn't do well, I started looking for available descriptions and literature.
Over time, information began to accumulate and I began to better understand how it works, what happens to the materials, what processes take place, in short, how AA (alkaline activation) works, which is the geoplymer under which conditions it arises.
If you are interested, I'm starting to give here information that helped me. Maybe they will help others as well. Please tell if you are interested.
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jules
New Member
Posts: 16
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Post by jules on Nov 28, 2021 13:51:21 GMT -8
So I'm starting to give here information that I thought was useful or interesting to myself. Most of the information is not in my head. Sources of information are mostly scientific papers, diploma theses and the like. I will always mention sources that are in Czech, Slovak or Hungarian. Translations done in Google, so if something is not understandable, sorry in advance and please write here. In the concept of prof. Davidovits are "true" geopolymers only those in the production of which it was used as a basic raw material, the alkaline activation of which is a geopolymer formed, metakaolin, ie kaolin calcined at a temperature of 700 – 900 oC. Kaolin as a raw material on However, according to some research, the production of geopolymers can be replaced by lower quality ones raw materials. These include, for example, rocks with a high proportion of zeolites. theses.cz/id/dpc5ge/dp_finl.pdf Substitution of metakaolin for the production of geopolymers by alternative raw materials Keywords: alkali activation, geopolymer, metakaoline, activator, blast furnace slag, curing temperature, compressive strength, zeolites Language: Czech |
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jules
New Member
Posts: 16
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Post by jules on Nov 28, 2021 15:29:19 GMT -8
Mechanism of alkaline activation of aluminosilicates substances
Disruption of Si-O-Si bonds in a strongly alkaline environment:
pH>12 ≡Si-O-Si ≡ + HOH 2 ≡ Si-OH
Neutralization of the silanol group: Phase type
≡Si-OH + NaOH ≡ Si-O-Na + HOH (Na, K n{ -(Si -O) z -Al -O} n .w H 2O)
=Al – OH (surface layer) + Ca2+, Mg2+ (Na +, K +)
Al(OH) 4 - (in solution)
Concentration of the mixture during alkaline activation
W> 1-10 (diluted suspension) hydrothermal conditions
analcim Na16 (H2O)16[Al16Si32 O96]
sodalit Na6[AlSiO4]6.8H2O
heulandit (Na, Ca)2Al3(Al,Si)2Si13O36 ·12H2O
W <1 (slurry, slurry)
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Post by Jura on Nov 30, 2021 13:03:47 GMT -8
Thanks. uff,, It was hard for me but I could uderstand without a translator :-) I have a few geopolimer research papers from our Istitute of Ceramics so if you can get polish well enough... |
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jules
New Member
Posts: 16
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Post by jules on Nov 30, 2021 20:53:05 GMT -8
so if you can get polish well enough... I don't understand this. Please explain, thanks. |
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Post by Jura on Dec 1, 2021 6:18:25 GMT -8
I don't understand this. Please explain, thanks. takze pokud rozumite polstinu, mohu vam ji poslat  Zdravinm ze Sleska |
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jules
New Member
Posts: 16
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Post by jules on Dec 1, 2021 9:35:24 GMT -8
I don't understand this. Please explain, thanks. takze pokud rozumite polstinu, mohu vam ji poslat Zdravinm ze Sleska OK. Please send. |
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