Wow, I was wrong. I would like to see how often this “post tensioning” is used. It is a failure waiting to happen IMO. How can concrete, which by its nature inflexible, be counted on to move without cracking over time? Concrete gets harder and harder as it dries. Concrete is never completely dry. The drier concrete becomes, the more likely it is to have micro-fractures.
I have one question for engineers, were the floors in the Twin Towers post-tensioned concrete panels?
concrete does not dry, it cures
the post tensioning like reinforcing steel gives bending strength and has been around a very long time quite successfully.