The reason concrete eats up mag and aluminum is a chemical reaction .One ingrediant of Portland cement is alumina made from blue clay .This reacts with the metal much in the way the elements of a battery work .Aluminum and mag are known as sacrificing metals .They leave before anything else .A short time on the crete is not bad but a long time is very bad .It's also the reason you can't use aluminum conduit in a concrete slab .
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