There is a brand new (a few year’s old) tall building here in Seattle made of concrete. Except it seems that some union worker skimped on some of the details, and did not coat the tips of most of the rebar in epoxy.
The rust problem started showing up right away. Repairs cost something like $1.5 million. But they still didn’t work. The tenents have all been moved out and demolition of the entire building (14 stories???) is forthcoming.
(For want of a nail, the shoe was lost.....)