cement floor fix
If it is just the surface, and budget allows, epoxy can actually work better than concrete and will bond better with the material under it. I use materials from Abatron but there are others out there. The Abatron material is very strong and easy to tool.
If the section has failed all the way down you will need to chip it out and pour and surface a new section.
Before doing anything have you determined the cause of the failure? Do you have a foot and corner of a piece of heavy shop equipment sitting on too thin a slab? If you put a veneer repair down it will fail in short order if this is the case.
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