David Corbett posted:

I'm not sure what kind of maintenance could possibly be done on concrete; my understanding was that the concrete would inevitably load up with chloride ions, the rebar would just as inevitably rust, and then the whole thing would be an un-repairable write-off because remediation of in-place concrete costs many times more than simply tearing down the structure and building it again. If that's not the case - if concrete walls are somehow easily patched and fixed when the need arises - then I have been approaching this from entirely the wrong angle, and won't have any problem. But I have a hard idea understanding how the concrete/rebar bond could be broken.