Very simple, concrete has capillaries, its porous. When the deformed metal bars, (rebar) are too close to the edge of the slab, column, pier, etc. it penetrates through the capillaries, then reacts with the steel. When steel rusts like this, it will expand many times its size, and literally spall, the concrete. It was a problem in NYS with bridge designs way back when. They use epoxy coated rebar now. I have read about electrolysis, where they use am electrical current to prevent the oxidation from happening.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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