Galvanized iron/steel is a layer of zinc. As it turns out, zinc reacts with concrete, so galvanized iron in contact with concrete needs an additional layer of protection.
I have a galvanized farm structure and we put latex paint on the galvanized surface where it came into contact with the concrete foundation.
It is possible for some types of aggregate added to concrete to chemically react with the cement too. IIRC, there is an interstate in Kentucky or Tennessee that is disintegrating from this problem.
Concrete is an unusual material in several ways. Most rocks are poor conductors of electricity, concrete is much better, not on par with metal, but for something made of various powdered rocks essentially, it is surprisingly conductive.
I have a galvanized farm structure and we put latex paint on the galvanized surface where it came into contact with the concrete foundation.
It is possible for some types of aggregate added to concrete to chemically react with the cement too. IIRC, there is an interstate in Kentucky or Tennessee that is disintegrating from this problem.
Concrete is an unusual material in several ways. Most rocks are poor conductors of electricity, concrete is much better, not on par with metal, but for something made of various powdered rocks essentially, it is surprisingly conductive.
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