More on the idea of salt melting sand/preventing it from freezing.
According to http://van.physics.illinois.edu/qa/listing.php?id=1580, salt lowers the melting and freezing point of water.
This also means salt water will freeze more slowly than regular water. Maybe it would be better to do an experiment concerning salt and the freezing point of water than salt preventing sand from freezing.
Other sites also stated that, when water is frozen, the molecules lose energy and come closer together to form the hydrogen bonding required to form ice. However, when salt (an impurity) is in the way, the molecules need to lose more energy.
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