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The
6th and Main Street Parking Garage, built in 1987 with
a south bay addition in 1990, is a nine-level,cast-in-place,
post-tensioned structure began showing signs of severe
distress. A structural analysis showed the cause of the
spalling to be the result of high chloride content at
the level of reinforcing. Many areas that were previously
repaired remained intact, but other spalls had also developed.
The future appeared to be an ongoing battle against corrosion,
knowing that high chloride levels were already present
in the concrete but had not yet penetrated the steel reinforcement
depth. The condition analysis offered a unique perspective
on understanding and controlling the corrosion. Future
prediction models allowed the owner to choose the repair
strategy with an estimated benefit in terms of service
life.
Restoration materials and methods included the use of
bonding agents, repair mortars, joint sealants and membranes,
corrosion inhibitors, sealers, and traffic deck membrane
technologies. Because the use of an anodic and cathodic
mixed corrosion inhibitor offered an excellent cost-to-benefit
ratio, a measurement tool was required to understand its
effectiveness. Knowledge of the corrosion inhibitor’s
past performance was readily available through the manufacturer’s
test results and various projects and field trials, but
understanding the corrosion activity was very important.
What will the corrosion activity look like after the corrosion
inhibitor is applied, after six months, a year, two years,
and further down the life of the structure? A state-of-the-art
monitoring program would show the results of the corrosion
inhibitor over a 2 year period by testing programs in
6 month intervals.
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Owner
Parking Authority of
River City
Louisville, Kentucky
Project Engineer/
Designer
HNTB
Kansas City, Missouri
Repair Contractor
Schnell Contractors, Inc.
Louisville, Kentucky
Material Suppliers/
Manufacturer
Sika Corporation
Lyndhurst, New Jersey
Condition Analysis of Parking Garage Prior to Construction
Material Service Life Company
Monroeville, Pennsylvania
Monitoring Company of Corrosion Inhibitor Performance
C-Probe Technologies Ltd.
Lutterworth, United Kingdom
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