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This
$21,000,000 project was located at the heart of the State
of Michigan Government Capital Complex. The 33-year-old
complex consists of an elevated landscaped area and
two below-grade
parking levels which encompass four State of Michigan office
buildings. The parking structure is directly below the
building and plaza, and provides structural support for
three of the office buildings. The plaza provides 400,000
square feet (37,000 square meters) of pedestrian area and
the parking levels provide 800,000 square feet (74,000
square meters) of parking
area. The structural system for the supported plaza and
parking levels consists of conventionally reinforced
concrete two-way flat slabs, 10 in. (250 mm) thick,
spanning to reinforced concrete columns. The plaza consists
of precast concrete pavers, planters, open lawn areas, and
4 feet (1.2 m) of soil in most areas. Due to over
thirty years
of exposure to the Michigan climate and deicing salts, the
parking slabs exhibited extensive corrosion deterioration.
Furthermore, the plaza deck was poorly drained and there
was extensive leaking to the parking level below.
Besides the
structural damage, the leaking was also causing extensive
damage to electrical and mechanical items.
The repairs to the parking ramp consisted of complete
removal and replacement of the supported slab with new storm
lines, fire protection system, and lighting. The new deck
slab contained many durability features, including 2 in. (50
mm) of cover over the top reinforcing, silica fume for
reduced permeability, a corrosion-inhibiting admixture, and
improved slab drainage. The parking slabs were coated and
the walls and columns painted. The repair to the plaza
consisted of complete removal and replacement of the
existing wearing course, plantings, soil, drainage system,
and waterproofing system.
These repairs were performed while maintaining 80% of the
parking spaces open for users and while maintaining all
building operations without disruption and without
compromise for safety.
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