Permanently Deleted
Portland cement and it’s consequences have been a disaster for the human race.
E: I do wanna push back on the “figured it out yesterday” part of the lime cement story though. Builders have known about lime for a long time but concrete is reenforced with steel nowadays. A lime/brine cement would eat through the steel reinforcement in a couple of decades and all those pretty modern cantilever things would fall over.
It wasn’t until recently that we had reinforced plastic rebar to use in the same type of constructions (refer to table 3h for revised tension ratings). That’s why the whole internet is lit up with articles about Roman concrete, because we finally have reinforcement materials to build more with it than a patio grill.
I’ve never heard of plastic rebar, that’s super interesting. i googled it and got “fiber-reinforced plastic,” is that what you’re talking about?
https://en.wikipedia.org/wiki/Fibre-reinforced_plastic
Fibre-reinforced plastic (FRP; also called fibre-reinforced polymer, or in American English fiber) is a composite material made of a polymer matrix reinforced with fibres. The fibres are usually glass (in fibreglass), carbon (in carbon-fibre-reinforced polymer), aramid, or basalt. Rarely, other fibres such as paper, wood, boron, or asbestos have been used. The polymer is usually an epoxy, vinyl ester, or polyester thermosetting plastic, though phenol formaldehyde resins are still in use.
FRPs are commonly used in the aerospace, automotive, marine, and construction industries. They are commonly found in ballistic armour and cylinders for self-contained breathing apparatuses.
