They are sodium chloride regular or rock salt calcium chloride potassium chloride and magnesium chloride.
Best type of salt for concrete.
However there is no such thing as safe for concrete de icing salts or chemicals.
Calcium chloride these round white pellets when used in a high enough concentration may chemically attack concrete.
Exterior concrete must be kept clear of snow and ice for safety reasons we understand that.
All of these are safe to use on wood decks and asphalt i am addressing issue when these salts are used on concrete and vegetation.
Calcium magnesium acetate calcium magnesium acetate is another reliable and safe alternative to rock salt on concrete.
The first winter for new concrete salt should never be used.
Concrete becomes damaged from de icing salts that are applied during the winter season.