i had somehting similar going on on my garage years ago - i belevie it was called spalling - or something like that
at that time i coached hockey with a guy in the paving business. Thru him i connected with a concrete guy come in and cut the concrete back a bit and then put some kind of special stuff in the area. it worked for about 10 years, then a few cracks developed. which i sealed this summer with some kind of "caulk like" product in a tube.
Will see how it holds up this winter. I am afraid I may have to try and find a concrete guy to come in again and i no longer regularly see the guy i coached with
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