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Concrete Surfaces

ESTRACTS from Report of American Concrete Institute’s Committee on Treatment of Concrete Surfaces :- When reinforcing steel in exterior members is not back at least one full inch from the outside face of the concrete, moisture works its way in, causing it to rust. Eventually, this rusting if continued will spall off the concrete and cause an unsightly appearance, and may even in severe cases affect the strength of structure. Good design should never call for such sizes of hoops, spirals, stirrups, &C., as will necessitate steel within one inch of the surface, but sometimes due to careless placing the steel will be at or near the surface.