We usually use what’s called ice melt, which is calcium chloride.
And we have very little concrete. Our driveway is gravel. Sort of.
Always read the label.
A lot of stuff labeled ‘Ice Melt’ is a mixture of calcium Chloride and regular rock salt.
The mixture works at lower temperatures because of the Calcium Chloride and is cheaper than pure calcium chloride.
The salt will also do damage to your gravel driveway by breaking up the larger stones into smaller stones.
But of course you won’t notice.