What de-icing products can be used on a patterned concrete walkway / driveway? (Salt causes problems.)
You are right, Salt will eventually harm or "shell" concrete.  I would suggest potassium chloride. This product will de-ice down to apx 15 F and will not harm the concrete or adjoining lawns or other plantings. Potassium chloride comes in a variety of brand names and can be found at most hardware stores.  We use it all the time for roof de-icing because it will not harm roofing,siding and vegetation.