Re: "drying" a solar cover
You wouldn't think it should damage anything, but make sure there are no oil or chemical spills on the concrete before laying it out. You wouldn't want to end up with something that will melt the cover or end up in the pool eventually.
Re: "drying" a solar cover
It should only take about 1/2 hour to dry the top side, then just pull it over itself half way, this should dry half the other side and the concrete it was lying on, then flip it to the dry spot, and everything should be good half an hour later.
Concrete and cover should be fine I do mine on the grass or the gravel driveway