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Calcium chloride pellets are the fastest acting deicer at all temperatures down to -25ºF.
Rock salt provides adequate, economical performance at temperatures at or just below 32ºF.
What effect does a common chemical deicer have on concrete surfaces?
It is widely known that deicers containing ammonium nitrate and/or ammonium sulfate will chemically attack concrete.
This action normally increases the number of freeze/thaw cycles that water goes through, which in turn can increase the potential for concrete scaling.
Each time water in concrete freezes, it expands approximately 9%.
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However, chemical deicers such as sodium chloride (rock salt), calcium chloride, urea, potassium chloride, and their combinations do not chemically attack concrete.
The do, however, depress the freezing point of water.
As temperatures drop below freezing, rock salt’s ice-melting performance slows substantially which can cause freeze-induced expansion pressures by increasing the number of freeze/thaw cycles.