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how to identify cor ten 9weathering steel0 in the field
how to identify cor ten (weathering steel) in the field
i am looking at an existing pedestrian bridge. how do i know if the bridge is constructed using weathering steel or if it is just rusting? overall the level of corrosion does not appear alarming. a secondary question is if it is weathering steel and i need to do some repairs, what are the durability issues with drilling holes or welding the existing weathering steel. would i be compelled to use weathering steel for any steel repairs or supplementary structural members? thanks, garry when was it built? where is it located (dry/humid)? hg located over a stream in connecticut (humid). i do not know the construction date, but it looks an awful lot like a pre-engineered pedestrian bridge - so it may not be too terribly old. see attached photo. look on the bridge for an identification plate or plaque. if it identifies the manufacturer, call and ask questions. i know continental pedestrian bridges have plates on an end post at each end of the bridge. the attached file is an example of an identification plate from a pedestrian bridge. it looks like unpainted steel to me. i also want to say it looks like unpainted steel but it's really hard to tell just from looks. i would suggest having a sample cut from the bridge and sending it away for a metallurgical analysis which should be able to tell you what it's composed of. if it has a large amount of copper (2%) than it's weathering steel, probably astm a588 if it's recent. eit with bs in civil/structural engineering. it's unpainted, the question is what kind of unpainted. i would find it hard to believe that a modern "pre-engineered" ped bridge manufacturer would ship an unpainted nonweathering bridge. if it is weathering steel, then yes, you need to have similar corrosion protection for the rest of the bridge. you *could* replace parts with painted nonweathering steel, but i don't see why you would do that. use weathering steel and weathering fasteners (a 325 type 3 bolts, etc.), weathering welding electrodes (aws d1.1 table 3.3). hg looks like weathering steel.that usually had rust that is fairly tightly adhering. our bridge across the delaware here has cor-ten griders but the outside, visible parts are painted because the public doesn't want to see a new bridge rusting !!!! your bridge looks like a continental bridge. i worked on a similar bridge. it was a bit heavier in order to carry golf carts but the details look very similar. it was weathering steel. and another picture. |
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