Modern concrete has steel rebar, which is very useful, but eventually corrodes. Stainless steel rebar could be used if longevity mattered, but usually it doesn’t because the building will likely become functionally obsolete and need replacing before then.
It only corrodes if it's not completely encased in concrete. The concrete stops the reaction. And, if one portion of the rebar is not encased it will eventually corrode through overtime.
This is something I wasn't aware of that is fascinating. The ph balance of the rebar's environment determines the progression of oxidation. There was a guy in the 1920's who observed this and had the idea to put cement in paint; it was so successful he renamed the company to cement spelled backwards.
https://www.sciencedirect.com/science/article/pii/S095006182... https://tnemec.com/about/You could wouldnt even need that. https://de.wikipedia.org/wiki/Opferanode
Yes, but you have to replace the sacrificial anode every so often.
https://en.wikipedia.org/wiki/Galvanic_anode
Like the plate of food on the grass for the bees at the barbecue
Wasps, not bees.
(Sorry, I'm a bit of a nerd. But I am sure you can cope with that.)
Does pork factor into this? (Serious question for an expert, not a joke.)
You did ask the bee for pork
Retract my bee slander!!
More for the wasps, I guess?
Wait, does this actually work?
Just wish I could claim credit. Decoy plate is essential.
And since nobody complained it sounds wasteful, I suppose it should be able to be just scraps.
May your next camping trip or picnic be wasp free!
It sure attracts the wasps. Whether you have less of them on your real food compared to the counterfactual, I don't know.
Define functionally obsolete.
Ultimately most tall structures as a reinforced concrete skeleton with glass hung on the sides.
It seems to me that as you're going to replace it with another basically identical concrete skeleton it makes sense to have that skeleton last as long as possible. And then refit that skeleton.
> Stainless steel rebar could be used
There are also coated and non-metallic rebars.
Coated rebar could be good, but the coating can be damaged anywhere from manufacture to installation.
Yup, every alternative rebar has drawbacks which causes increased costs or different failure modes which is why they tend to be used in specialised applications where they are necessary.