Solarpunk Urbanism

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A community to discuss solarpunk and other new and alternative urbanisms that seek to break away from our currently ecologically destructive urbanisms.

Henri Lefebvre, The Right to the City — In brief, the right to the city is the right to the production of a city. The labor of a worker is the source of most of the value of a commodity that is expropriated by the owner. The worker, therefore, has a right to benefit from that value denied to them. In the same way, the urban citizen produces and reproduces the city through their own daily actions. However, the the city is expropriated from the urbanite by the rich and the state. The right to the city is therefore the right to appropriate the city by and for those who make and remake it.

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Building ecovillage of storm-proof homes made of bone-like biomaterial (www.youtube.com)

submitted 2 years ago by MrMakabar@slrpnk.net to c/urbanism@slrpnk.net

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[–] livligkinkajou@slrpnk.net 1 points 6 days ago* (last edited 6 days ago)

I just watched the video about the geoship and I got curious about it as well.

He talks about the cure time being really quick but wouldn’t you still have to fire them?

In the initial design, they mention they do not need to fire them. The reaction of the materials was an exothermic process that quickly raises its temp to around 60°C, idk if it goes higher than that. See non instagram link video

Another thought is that this seems like it would be terribly insulated. Like wouldn’t the ceramic be conductive?

At least from recent materials on the socials, they use an R-30 insulation between the panels. The video doesn't show nor mention it, so I'm not sure if this might be a recent change

but the ceramic frame itself seems like it would not be great. I wonder if it would be possible to use timber for the frame?

You might have been onto something, as they seem to have changed their frames. They look different now as seen here

Before:

After:

Besides, there is all this secrecy around this magical powder they use to make this special bone-like material that it is hard to know exactly what is going on.

After some digging, I want to share this too, as I found this comment on YT by @johnturner8286 about what it might be, so Iĺl post it here too.

The cement is called Calcium Phosphate Potassium Cement (CPC) It's a geopolymer, that once wetted cures by reacting with an acid such as phosphoric, oxalic, acetic or citric acid. It doesn't have to be made with hemp, you can use wastepaper from a recycling facility too. The fibers make it very tough and strong; you could beat on those walls with a two-pound sledgehammer without breaking through. This same product can be made into furniture; even the frame inside upholstered pieces, tacked and stapled to secure the upholstery! If treated with a catalyzed finish it can be used directly as a sink, bathtub or floor.
It can also be made into wall panels, plates and studs for low-flame-spread, one-hour-fire-resistant, woodless construction in a more conventional platform-framed home

At 2:04, there is a table showing MKP, which might be Monopotassium Phosphate, and considering it MKCP also has applications in nuclear¹'², oil and gas³ industries, our friend @johnturner8286 might be right. Per Table 1 of link ³, it might be a system MgO–KH2PO4 with MgKPO4•6H2O and MgHPO4•3H2O as hydration products

For the curious, this paper also talks about potential ratios in the mixture for a different version with silica, but the article is too new and I couldn't find a free version:
New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance

¹ Magnesium potassium phosphate cements to immobilize radioactive concrete wastes generated by decommissioning of nuclear power plants
² Calcium silicate phosphate cement with samarium oxide additions for neutron shielding applications in nuclear industry
³ 2015, Adhesives Technology Handbook Sina Ebnesajjad PhD, Arthur H. Landrock