Thank you very much for the professional advice. I want it to look like the attached photo. . . I bet there are some porcelain tiles that are similar that offer the resistance to abuse and dimensional tolerance. I'll look for those.
Ok, let me add my own fact pattern to this evolving discussion.
I have a 17x12 slab in a single car garage. 4000 psi, wire mesh up on chairs, over 8" of #2 aggregate compacted with a Stego Wrap 15 mil vapor barrier. Overkill, I know.
Surface finish from the concrete conctractor was...