Well this is what the Morton company says:
Quote:
Ice melters can be harmful to poor quality concrete or new concrete less than a year old, and may cause future cracks or other damage because all deicers increase the number of freeze-thaw cycles that can stress the concrete. Morton® Safe-T-Plus® can help reduce the harmful effects of ice on concrete surfaces, but all sidewalks and driveways are susceptible to deicer damage and should be promptly cleared following ice break-up to reduce the risk of damage. So if your concrete surface is less than a year old, it’s best to use a good, old fashioned shovel or snow blower to clear the ice and snow.