No. Salt and sand are only applied to hard surfaced roads due to the damage it can cause to rock roads. Gravel roads that become slick are roughed up with a motor grader to provide better traction. In some cases, lime, rock chips, sand, or rock is applied to the surface.
Salt on a gravel road causes maintenance problems as the road begins to thaw out, often making conditions worse. As the salt melts the snow/ice, it causes the salt and water solution to penetrate into the road surface. This causes the road surface to break up and loosens the previously hard packed surface. This process will continue to progress into the base of the road and can create a quicksand like effect. Further damage to the road can occur as vehicles drive over the road because they sink into the road instead of riding across the top.