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In 1996, a condition study of the Victory Parking facility
located in the core downtown area of St. Paul, Minnesota,
found that in the top mats of reinforcing bars in the floor
slabs on Levels 2 to 3, many of the 1 in. (25 mm) diameter
bars had corroded completely, leaving corroded remains of
rebars and compromising the structural capacity of the parking
decks. The slabs were divided into 13 phases for structural
repairs. All top reinforcing steel mats were removed and
replaced with epoxy-coated reinforcing bars and structural
concrete. The slab sections under repair were supported by
hanger rods hung from the slab above. This support system
eliminated the need for conventional shoring. The new top
halves of the slab sections were monolithically bonded to the
bottom original slabs using the hanger rods as a mechanical
shear bond system. The hanger rods were cut off after concrete
had achieved adequate strength. A concrete overlay was
installed to conceal the hanger rods and for surface drainage.
A traffic coating was also applied on the concrete surface to
provide long-term protection.
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