Home Improvement Questions? Ask a Handyman for Answers
The moisture is coming from the air not the ground. Since the slab is probably colder than the air the moisture in the air condenses on the surface of the slab causing condensation/"sweating". So installing anything on top of the slab to stop moisture coming up through the slab is not going to stop this condition.
Water doesn't migrate up through a slab on grade. What you describe is a common problem in houses like yours and I described why it happens in my original answer.
Neither one of these articles applies to the conditions you described. The first talks about slabs below grade. The second talks about wet conditions below grade. The latter is not seasonal and wouldn't apply unless the area around the house was poorly drained and rainfall was significant. However it is common for condensation problems to occur during the Summer when relative humidity levels are higher and there is more moisture in the air.