On 23/04/2019 16:34, DerbyBorn wrote:


That steel that protects itself with a thin layer of rust seems popular for
bridges now.


Quite a lot of box girders on bridges have no protective coating on the
insides even though they would be prone to condensation.
They now fit dehumidifiers and keep the humidity below 60% (IIRC) as
steel doesn't rust then.
Its cheaper and lighter than paint, etc.