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Road salt (also known as de-icing salt, rock salt, or snow salt) is a salt used mainly as an anti-slip agent in winter road conditions, but also to prevent dust and snow build-up on roads. [1] Various kinds of salts are used as road salt, but calcium chloride and sodium chloride (rock salt) are among the most common.
Magnesium chloride is used for low-temperature de-icing of highways, sidewalks, and parking lots. When highways have dangerous ice buildup, road maintainers apply magnesium chloride to deter ice from bonding to the pavement, allowing snow plows to clear treated roads more efficiently.
More recent snowmelters use other salts, such as calcium chloride and magnesium chloride, which not only decrease the freezing point of water to a much lower temperature [2] but also produce an exothermic reaction, whose dissipated heat further aids in melting.
All that damage starts after ice melts, so adding an ice melter (which is heavy in chemicals such as sodium chloride, magnesium chloride, calcium chloride, or other elements) can cause corrosion ...
Salt grains, used for melting ice and snow, seen on an icy sidewalk. (Getty Images) (Dima Berlin via Getty Images) Ice has a semi-liquid surface layer; When you mix salt onto that layer, it slowly ...
Lowering the freezing point allows the street ice to melt at lower temperatures, preventing the accumulation of dangerous, slippery ice. Commonly used sodium chloride can depress the freezing point of water to about −21 °C (−6 °F). If the road surface temperature is lower, NaCl becomes ineffective and other salts are used, such as calcium ...