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Originally Posted by WrightCONCEPT
Concrete doing that seems like there was something wrong with the mix and pour or most likely the rebar that can cause that crumbling.
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The parapet panels are held in place with epoxy anchors, the CTA has already admitted that not every anchor was properly filled with epoxy. This likely allowed certain panels to flex because of wind or the train vibrations, and the flex led to shear forces that caused failure at the concrete slab edge. I'm not sure there is an easy fix for this, though. Likely they will need to design some kind of reinforcement for this joint, probably something ugly bracketed on the outside of the structure.
I hope they figure out a solution, because there will be roughly 6 miles of similar sound parapet walls yet to be installed on the RPM project. I still think the problem is not safety critical, but I take back what I said about it being "cosmetic".
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