When I moved into my older home 12 years ago, the driveway was about 4 years old and in very good condition. We are on the expandinging and contracting black soil. 12 years later the drivewway(10' x 140') is in at least 25 pieces. I will soon consider having the concrete removed and rebuild the driveway. Anyone have experience on what type of base ( material and thickness) might provide yeras of a good driveway on this black prairie soil?