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Re: CONCRETE: Parallel Cracks in Beam Soffit/Web

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Bill Polhemus wrote:

  In some cases, there is concrete spalling that reveals the No. 6 mild steel rebar. It looks as though the rebar has succumbed to high humidity and likely presence of Chloride ion floating around, and has "gotten fuzzy," so that it has created these cracks parallelling the nearest concrete edge, sometimes even spalling the concrete off.
Bill,

        It sounds like you are right on.

        The presence of chloride ions allows the reinforcing to rust, hence it "grows" like a tree root and breaks off the concrete.

        You probably have to replace the walkway.  When you do, consider epoxy coated reinforcing; it will greatly extend the life of the structure.

Regards,

H. Daryl Richardson