When I had my first shop floor section cast the contractor had a joke about "Do you know when concrete starts cracking?" "While it's still in the truck!" Did a great job out here in the desert anyway, 20 years on. I wanted strength over "pretty" and he did right by me. (I mentioned that I was fine using "leftovers" from other builds so most of my shop is done with thicker stronger "older" stuff----win win; they got to "clean up" and get paid and I have extra trusses, thicker sheetmetal and heavier roll up doors....)
My addition to that was very much in the same vein. 20'x60' total now. (And I'd like to put a carport on it too...)