Talk with your concrete guy and tell him your plans and concerns.
I'm glad I did, I assumed some things and was wrong.
Read up on vapor barriers, touchy subject but you get to decide not the contractor.
Consider doing the compacting yourself, you'll probably spend more time at it than the contractor will. (?)
I cut control cracks on my floor with a skill saw and would never again.
rent a walk behind or pay someone to do it.
Good luck, keep us informed !