What kind of concrete should I use to repair a crumbling sidewalk with
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QUICK RITE WIKK LAST FOR AWHILE YOU WILL NEED TO TAKE IT UP AND REPLACE
Lots of videos here:
https://www.youtube.com/watch?v=pXPyULfQhYw
Before you go to the expense, call your local municipality (city or county?) and see if they will replace your sidewalk. If you know anyone, (friend or family) who does concrete work, maybe they will repair it correctly for a small charge.
If it's on your property, and not a public sidewalk, same answer. Good luck.