The guys that said all concrete cracks are all 100% correct. Otherwise rebar serves absolutely no purpose. Excessive wide cracks are a different issue. That is not caused from wether you parked on it or not. Even the wall will crack. It happens. I assume there was some engineering specs for this project and if your contractor followed them he has done his job. The only concern that you have is the spalling. That may be an issue. I would call your contractor and make a note of it and have him notify his supplier. Sometimes there are some impurities in the concrete that can be repaired. Other times there is an issue with the concrete air entrainment or other issues.
The big thing here he is not to lose your head and lawyer up as has been advised. That will cost everybody money and get everyone’s guard up.it is a last resort. If your contractor is reasonable he will Work with you and come up with a solution.
Thicker concrete, more rebar or a Thicker base does not stop cracking. It can minimize it though. There is no need to spend money on testing at this point. Have a look at all of your neighbours garage pads. They will all be cracked and some may have some issues that yours has.
As for adding water, most concrete is designed to be poured at a reasonable, workable slump. Some water can be added to achieve this! Using water for finishing CAN be a no-no. if excessive water is used or at the wrong time.
To summarize, keep your head, communicate, make notes, take pictures and don’t listen to your buddy who’s son got a job at a concrete plant for a summer.
When in doubt consult Canada or Alberta redimix standards code and Alberta building code.
Good luck.
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