Hey,,,How much SALT is used on that bridge in the winter ??...
MN official: Sadly, seven now confirmed dead. More sadness, they expect that number to go up.
That would be a point if it were a deck failure, but I didn't see anything that looked like a deck elongation happened.
The bridge had an automatic deicing system. Of course, cars could track salt onto the bridge which could eventually drain into the supports. Chloride corrosions are some of the worst types of corrosion known (especially chloride stress corrosion cracking). Presumably the State would inspect/clean periodically to prevent corrosion failures. Of course, that still needs to be determined (if it was actually the cause).
Apparently none. It has a PVC plumbed system for dispensing a deicing fluid(iceban) over the deck. I assume the fluid is an organic alcohol, or glycol type. THe only MSDS I found for it was ridiculous and said it was "a pure" liquid, with 80% water and the rest organic. I think MN and the other states use the generic. The IceBan co seems to be bankrupt.