Concrete base problem in garage shop. Any construction folks?

When I had my garage built, The floor was poured by my friend's brother who owns a Cement plant. He suggested 1/2 inch rebar formed into a grid that encapsulated the whole floor to strenghten the floor and remove flex. That was 1994 and I have had zero issues and I'm constantly working on all kinds of vehicles in it. Not a crack or issue anywhere.