Actually, I laid down a bag of osmotic lawn fertilizer (the stuff with the little brown ball bearing looking bits, along with ammonium sulfate crystals)on my driveway a while back. The crystals attacked the ice immediately, and you could hear it cracking. But there was so much and I knew eventually it would dissipate too much, so the ball bearings then become traction devices. Again, it won't kill the lawn when it thaws.

Most of the driveway is ice free, but since I didn't cast the fertilizer all the way to the end, I now have a nice 1 1/2 inch thick layer of clear solid ice. I may have to salt that later.