Oregon uses manganese sulfate IIRC.

Jim

David Brodbeck wrote:

> I know there's some kind of "expensive stuff" they put on aircraft runways
> because it corrodes aluminum less than salt.
>
> For a while some Michigan counties were also putting some "expensive
> stuff" on roads for a mile on each side of bridges, to try to prevent the
> salt from corroding the steel reinforcing bars in the concrete.