Quote:
Originally Posted by Marshal
officedweller: I am 90% sure they are steel. For structural design reasons and constructability reasons, concrete would be an odd choice. But there are numerous 'fancy' concrete formulations (additives, etc.) that could do that job and last forever.
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Seeing these latest photos, I'm pretty sure that I was wrong: they look to be concrete after all. Still seems an odd choice, but there you go.