How do you repair crumbling sidewalks
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You rip them up if they are crumbling and are unsafe, and start over again.
https://www.hometalk.com/diy/repair/home-exterior/q-cement-sidewalk-crumbling-9161561
We have cement sidewalk that's crumbling in places around our home.
I agree, if they are crumbling, there is nothing for cement to hold onto and it will start crumbling again.
There is no way to fix them. They need replacing.