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Old concrete

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    I am working on adding some roof top units to an existing building.  Date of original construction is unknown.  The roof framing consists of a 4.5" concrete slab on 8"x14" monolithic beams with square columns.  In a few areas, the slab was demo'd previously for added vents, etc.  The rebar is 1/2" square and twisted, 7"oc each way.  Anyone ever seen such?
Brian K. Smith, P.E.