What might work, depending on the ground layout under it, is to drill holes in the concrete through to allow to escape from the lowest points. Other than that, use a concrete disc cutter, to cut channels leading outside. What I often do when I park the car wet in the garage, is leave the roller shutter front door open by a few inches, plus the 'people door' at the rear - the roller door faces into the prevailing wind, so lots of through air flow and it quickly dries floor and car.