Concrete does not sweat. This is a term used to describe moisture found on the top of the surface of the concrete. This is caused from condensation. Insulation under the pad will help, but the cause is from the changing temperature in the air and the amount of moisture in the air, known as humidity. You either have to heat the inside of the building, or insulate it really well, or move the air around enough to keep it from forming. Vents at the bottom of the walls and peak of the roof help, but if the building is too big, or if the humidity too high and the temps drops quickly overnight, it's still going to happen. Air can only hold so much water. The warmer the air, the more moisture it can hold, so if you have warm temps and high humidity, then it cools off, you will have moisture appear on the surface of where this happens.
Eddie