Condensation issue

Ayup. I've seen this plenty of times. I worked in trucking for 40+ years, mostly based in the PNW. The weather up here is such that when it's cold in the winter, often the concrete dock would sweat, and that was on a slab sitting 4' above grade to load/unload the trucks. I had the same issue in my shop (SW Washington). I fixed it by putting two cheap-o box fans in the shop on a timer. I had the fans at opposite sides of the shop, facing the same way to make a "swirl" pattern of moving air. To the best of my knowledge, sealing the floor won't help. All our truck docks were sealed and still looked like swimming pools at times. I ran the box fans for about two hours a day, at the warmest time of day (1400-1600). I never had an issue after that. Also, insulating my shop helped a LOT with moisture inside.