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[quote]QUOTE: Originally posted by rrandb The facts are from the FL DOT. Where are yours from. [?] [/quote] As far as the cement/exposed rebar, direct hands on experience with multiple steel reinforced concrete parking structures that had been "cancered out" through years of neglect Once the rebar is exposed, the water wicks down between the bar and the concrete around it, the invasiveness is self sustaining and accellerates expotentially. Really fun when you walk around a 8 story garage knocking the deck and getting hollow sounds because of the delamination of the cement at the first layer of bar., and it only gets worse, the deeper the water works it's way into it. Re bar actually "expands" as it corrodes, adding a pushing effect seperating the cement from it And for the steel, not all steel is meant to be corroded, and much of what was designed tro be that way didn't workout as hoped for (Cor-ten I think was one, that will 'rot' out anyway if kept continuously wet) A good site for corrosion basics is http://www.corrosion-doctors.org/InternetResources/NPL.htm#Stress
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