Several years ago, we had a really bad ice storm. Our house (and concrete driveway) was four years old at the time. I made the mistake of spreading salt (note: bag said safe for concrete). In just days, my driveway was ruined. After that, it kept getting worse and worse with every freeze and thaw cycle. Found a small piece of salt in the garage that had melted (disovlve) the cement down to 1/4 inch. Concrete and salt don't mix!!!!