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Perfect Aircrete, Kitchen Ingredients [video]
- WorkerBee28474 11mo agoI heard about aerogel as a kid and only recently learned how extremely hard it is to make [0], so this seems like a cool and more accessible material in the same vein. [0] https://www.youtube.com/watch?v=Y0HfmYBlF8g https://www.youtube.com/watch?v=Y0HfmYBlF8g
- tartoran 11mo agoWow, this is a fantastic material. Hope to see it used soon
- deleted 11mo ago[deleted]
- ansgri 11mo agoIt really is amazing, you can build a whole 2-story house out of it quickly using polymer-based glue instead of mortar, only using traditional reinforced concrete in some critical places. Was quite popular in russia, last I checked. Unfortunately hard to find in some better CIS countries.
- lm28469 11mo agoYou can also build brick walls without mortar, some of them even contain insulation, you just need to plaster both sides and you're good to go. Porothern dry fix is a good example I had the choice between aircrete and that for my house and went for good ol bricks instead
- AtlasBarfed 11mo agoSo they buy preforms, or they mix it themselves and pour into forms?
- orthoxerox 11mo agoIt's precut autoclaved blocks.
- orthoxerox 11mo agoYes, about 60% of all new single-family homes are built out of AAC in Russia. It's also very common as an infill in reinforced concrete frames, like blocks of flats. There are AAC factories in Ukraine, Belarus, Kazakhstan that I know of. The rest are probably too seismically risky to be major AAC markets.
- ansgri 11mo agoDidn’t really study this aspect, but it feels like thick AAC blocks would be better for seismic stability than those tuff stone blocks popular in Armenia. It’s lighter, glues to neighboring blocks better due to perfect shape, and has better heat insulation. It would be amazing if AAC-like material could be produced on-site economically to create a lighter form of monolithic reinforced concrete construction, like filling a formwork with expanding foam.
- MaxikCZ 11mo agoI always thought of concrete as cement + water + sand. This video makes aircrete with cement + water + thickening/foaming agent, but it doesnt use any sand, no?
- aidenn0 11mo agoConcrete is cement plus aggregate (it doesn't have to be sand; it could be gravel, for example). Coarse aggregates wouldn't work well in this, but it would be cool for a followup video where sand is used. The wikipedia pages suggests that this is more prolery referred to as "foam mortar" or "foam cement" https://en.wikipedia.org/wiki/Foam_concrete https://en.wikipedia.org/wiki/Foam_concrete
- cornholio 11mo agoYou could say the aggregate is air and the cement still performs its role as a binder, it binds all the air bubbles into a stable matrix. Hence "aerated concrete".
- mikewarot 11mo agoHe had a note up that said he's been having some luck with a major addition of sand, but it'll be a bit before the video for that goes up.
- pstuart 11mo agoThere's also the possibility of using various fibers instead of sand.
- schiffern 11mo agoYes, aircrete mixes usually don't contain sand. This isn't something unusual about this video, it's true for most aircrete recipes. Another method: https://www.youtube.com/watch?v=tnNua21zx78 https://www.youtube.com/watch?v=tnNua21zx78
- leguminous 11mo agoAerated concrete is an established building material in some parts of the world. In Europe, a big manufacturer is Ytong, and they even make precast panels in addition to blocks. It's made differently from this, though. It is aerated through a chemical reaction rather than mechanically.
- stoneman24 11mo agoThere was recently a crisis in older publicly constructed buildings in the UK that were built [0].The aerated concrete had a limited lifespan especially if it was damaged and had contact with water. Lots of people looking for compensation and claiming mis-representation. [0] https://www.bbc.co.uk/news/education-66669239 https://www.bbc.co.uk/news/education-66669239
- cornholio 11mo agoThe UK crisis involved steel reinforced AAC beams that were used (of all places) to support roofs of schools. UK turned out to be a rainy place, the rain infused into the cellular structure and corroded the steel, with disastrous consequences. It's a very particular use case of a very particular product, not relevant to the wide majority of AAC uses around the world, which is largely non-structural and not reinforced, or subjected to moderate compressive loads, such as lateral walls for 1-2 stories buildings in non-seismic areas.
- gerdesj 11mo agoThe risks were understood (by engineers) and this usage was given a "shelf life". Unfortunately, those risks were put into the "Oh we'll forget about it" or "We'll wait until it looks a bit shifty" categories. However as any fule (engineer) kno, reinforced and especially pre-stressed conc members will fail in quite a dramatic fashion. Unless you notice rust dribbling out then you can end up with anything from the roof failing to the roof exploding. I don't think anyone was daft enough to pre-stress these things. I don't know how much money was saved but it was a really stupid application and basically ended up punting far greater costs due to remediation down the road.
- schiffern 11mo agoNote that aircrete itself has existed for decades, but production of aircrete has typically required buying (or DIY-ing) a high-capacity foam generator. What's novel in this video is the production method, which uses only a standard cement mixer. The 'traditional' method is here: https://www.youtube.com/watch?v=tnNua21zx78 https://www.youtube.com/watch?v=tnNua21zx78
- mikewarot 11mo agoI think this might make a great material for large machine tool bases. Concrete lathes have been a thing since WW1, but not common.
- cjbgkagh 11mo agoAircrete is far too fragile and will not hold tolerance. There is a shit towards ultra high performance concrete but that’s a completely different material.
- sitzkrieg 11mo agonighthawkinlight's entire youtube channel is full of practical gems. i used several of his waterproofing techniques to flawless effect
- SilverElfin 11mo agoI like the idea of a lightweight concrete like material that can be used to make houses more durable. Is there a way to replace drywall interiors with this or something else? I really hate how susceptible drywall is to things like moisture and mold, but also how repairing it requires a dusty and messy process of cutting, sanding, mud, tape, and all that. It would be so much easier to have waterproof durable panels that can be opened to access the interior wall spaces (for electrical or plumbing stuff). Is there a solution?
- IshKebab 11mo agoFuck aircrete. My house has aircrete blocks in the extension and you need special expensive wall plugs to attach things to it that are rated to a grant total of 25kgf. Because nobody would want to actually hang heavy things on their wall right??
- what 11mo agoMost people don’t want to hang heavy things on their wall?
- tomcam 11mo agoBig-screen TVs Cabinets Shelves Large mirrors Pot racks
- what 11mo agoMost people aren’t putting up their own cabinetry or shelving, they’ll hire a professional and they’ll know how to deal with the wall.
- IshKebab 11mo agoMost people aren't hiring professionals to put up shelves lol. And there is no "how to deal with the wall". It's fundamentally weak. Best you can do is Rigifix M8 bolts which are rated to about 25kgf as I said.
- ajb 11mo agoThose seem to be for drywall. The strongest option is using resin to install some threaded rod, eg fis-v which is rated to 43kgf (shear load) in the lower of the two rated aircrete classes. That's because it spreads through the holes and therefore has a larger surface area of interface. The downside is that it's not removable.
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- lvl155 11mo agoLove the enthusiasm but people get PhDs just for concrete. This stuff has been around for a very long time.
- victorbjorklund 11mo agoHas this particular reaction been around? The news isn’t the end result. The news is he does it in a new way (that does not require large upfront investments).
- lvl155 11mo agoYou can read the comments in the video but material science involving concrete is quite advanced.
- prawn 11mo agoJust started watching this, but if anyone has seen similar material used for some form of retaining wall (even 1-4' high), I'd be happy to hear about it. Got a lot of slope to deal with, and materials for attractive retaining walls add up.
- burnt-resistor 11mo agoI saw this days ago. The problem is validating strength and integrity over time. That sort of long-term follow-up and scientific, repeatable destructive testing doesn't fit into a short video. Evangelizing unproven construction methods and materials is reckless without context and nuance. When an office building was built in any earthquake-prone area that housed a nuclear engineering consultancy I worked in for several years, multiple test specimens of concrete were poured and kept for later testing and evaluation, and extra ones were kept should there ever be a question about the concrete's quality in the future.
- victorbjorklund 11mo agoThere are tests that can be run to find those things out and that will hopefully be done.