[liotier]

> The steel is protected from corrosion by the concrete itself

I guess that the steel is protected by something else because, as the pre-1970 builders ignored and as it dawned on everyone else 20 years ago, concrete is not waterproof.

[dugditches]

was what he was referencing. https://en.wikipedia.org/wiki/Galvanic_anode

[Arizhel]

>concrete is not waterproof.

Ancient Roman concrete is.