Adding glass to geopolymer

[t686]

The guy who made Ferrock uses chipped glass as in this picture: picssr.com/tags/oodham/interesting/page4 from homeless sites to mix into his cement.  Has anybody tried using something like that to strengthen their concrete or bricks? There's a youtube link: www.youtube.com/watch?v=yWPzERdNh50
I'm not sure if this is ferrock or something similar in this link: www.google.com/patents/US5718857 which it explains the ingredients, but it mentions it's 5 X stronger than concrete and has a crystalline structure, unlike geopolymer which has no crystalline structure.  It also said another person used dirt instead of what he uses.

I found this link: msutoday.msu.edu/news/2012/recipe-for-success-recycled-glass-and-cement     shows glass can strengthen portland cement 
and this link: www.youtube.com/watch?v=QCVrC0cutr8  where finer and finer aggregates of glass are used as a replacement for sand in concrete

And there's a video on youtube on water glass on youtube where he mixes just water glass and sand to make a hard rock that is still brittle but adds some refractory concrete

And here is a link on the possible dangers of using glass: www.vitrominerals.com/wp-content/uploads/2015/10/Recycled-Glass-in-Concrete-110302.pdf

And here it proves powdered glass can be added directly to cement as a replacement for particles without adding anything special to prevent the bad reaction: ascelibrary.org/doi/abs/10.1061/(ASCE)MT.1943-5533.0000126

[Deleted]

The alkali–silica reaction (ASR) gives concrete it's strength.
ASR is only a problem if it happens after the concrete became hard and rigid.
In cured concrete ASR can only happen if it remains moist or becomes moist again.
If recycled glass is grinded to less than 0.044 mm and added to cement the ASR reaction
becomes faster and may consume the calcium hydrate before the concrete becomes hard and rigid.
Vitro minerals adds alumina to the recycled glass to increase the reactivity further.
As aluminium oxide is amphoteric it reacts with acids as a base and with bases as an acid
and thus can react with the acidic silica as well as with the basic calcium hydroxide.

In the environment of a stove concrete can hardly remain moist enough to allow ASR.

With respect to geopolymers:
With sufficient alumina content micronized recycled glass can serve as a pozzolan for geopolymerization.

In refractories glass cannot serve an aggregate due to its low melting point,
however in small amounts it may serve as a sintering aid.

[t686]

That's interesting. With ferrock, I read one article where it appears that 90% + is steel powder (unrusted) iron oxid  in the initial concrete mix and glass as aggregate (doesn't cause the bad reaction with glass as with portland). And he shows in his reaction equation on youtube salt water, which makes bubbles when reacting with iron oxide. His discovery was when he was trying to find methods to prevent rust, and when he came back the next day, he thought it didn't work, but found a hard, glass hard rock in the bottom that formed. I'm not sure of the actual strength or toughness, but five times seems to be a high number and his bricks look like high quality. I wonder how something like that would behave under heat. I also read an article where all they had in a mold was sand, and they laid a plastic sheet over it with a hole and briefly pumped co2 with a compressor, and the brick immediately turned hard. In one direction it can be pulled apart, but this may be off topic, the ferrock consumes co2 while it cures at a higher rate than portland.  This picture shows hematite, which may be a precursor in the concrete reaction, but it looks very similar to his steel dust: www.mindat.org/photo-718324.html    This seems to explain what's going on in the salt water solution: onlinelibrary.wiley.com/doi/10.1002/maco.201508705/abstract  This site www.scientific.net/AMR.1120-1121.773 shows lepidocrocite might be the final product and this picture www.google.com/search?q=lepidocrocite&biw=1536&bih=783&tbm=isch&tbo=u&source=univ&sa=X&sqi=2&ved=0ahUKEwi0nM-ehtjNAhUIRyYKHfCxCv0QsAQINg#imgrc=JqAwwXEYzWarHM%3A  looks like the color of his rock.  What may have happened was the iron oxide was reacting with the co2 and the glass in the test tube to form the mineral or rock.  And this adds something to the picture: dl.sciencesocieties.org/publications/sssaj/abstracts/54/4/SS0540041060  At the end of the youtube video on his mortar mix in ferrock, you can see how metallic the mortar mix looks, it almost looks like steel.  There is a site that sells steel powder, or you could make it yourself as you say using a ball mill.  And finally this shows hematite and goethite are cementing agents: books.google.com/books?hl=en&lr=&id=YvbfBAAAQBAJ&oi=fnd&pg=PA317&dq=hematite,+iron+oxide&ots=B19NwWC38O&sig=uwtlMwlVHcOBx9u0LLKlZBqG6ro#v=onepage&q=hematite%2C%20iron%20oxide&f=false    I wonder if in a rocket stove something like ferrock would form shiny hematite in hot spots like this link may say: link.springer.com/article/10.1007/s00254-004-1034-z

[t686]

Update: This is kind of funny. Appartantly you need to run pure co2 into the mortar to make it cure. This link explains it: ironkast.com/technology/whitepapers/first-demonstration-structures-using-a-new-carbon-negative-building-material/ He used the exhaust from a generator and a hose.  I don't see how he can possibly say it's taking carbon dioxide away from the air when he's artificially introducing it to make it cure.  But the mortar does look cool.  The organic reducing agent is probably ascorbic acid or vitamin c.  But one advantage I see of this for high temperature is that this link: ironkast.com/technology/whitepapers/top-ten-list-of-characteristics-for-ferrock-a-new-green-building-material/ says it doesn't break down like regular concrete and instead becomes denser and forms magnetite.  All you need is a balloon bottle and a plastic bag to fill the concrete every 12 hours which might actually be feasible.  The best performing mixture was 60% iron powder, 20% fly ash, 8% limestone and 10%
metakaulin, and most likely 2% ascorbic acid as the organic metal reducing agent.

But I did look up this: www.sustainablebuild.co.uk/environmentally-friendly-concrete.html  Apparantly it's been around for awhile and is used in refractories and is quite strong and stronger than the iron mineral.  I'ts magnesium, and it's just epsom salt combined with monoammonium phosphate.

pubs.acs.org/doi/pdf/10.1021/acs.chemrev.5b00463 and this patents.google.com/patent/WO2012028419A1/en?q=novacem (novacem cement)  

[lyub]

It's been a while since last published on this interesting topic. Upon further researching it, I found a useful recent (2021) overview of the existing literature on using glass in concrete & geopolymer foams with the emphasis on their durability.
Hope that will be useful.
Waste Glass in Cement and Geopolymer Concretes: A Review on Durability and Challenges
www.mdpi.com/2073-4360/13/13/2071

Has anyone extended this knowledge into practical application(s)?