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Honorable Mention: Longevity Category

Crown Center Parking Structure Cathodic Protection
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Kansas City, Missouri

Submitted by Structural Engineering Associates


Crown Center Parking

Owner
Crown Center Redevelopment Corp.
Kansas City, Missouri

Repair Contractor
J.E. Dunn Construction Company
Kansas City, Missouri

Material Suppliers
Corrpro Companies, Inc.
Medina, Ohio

The Crown Center Garage is a multi-level parking facility in Kansas City, Missouri that was built in 1970. The total surface area of the five elevated parking levels is approximately 530,000 sq ft (50,000 sq m). By 1980, salt had penetrated to the top level of reinforcing steel and the concrete slab was suffering from chloride-induced corrosion. A major repair program was initiated in 1981, where delaminated concrete was removed and exposed reinforcing bars were sand-blasted. The slabs were then patched and overlaid monolithically with 1 1/2 inches (38 mm) of latex modified concrete. However, three years after the repair, the slab was again showing distress from reinforcing steel corrosion. This corrosion activity was threatening to destroy the previous repair. Cracks in the latex topping were allowing moisture to penetrate to the reinforcing steel surface. 

Cathodic Protection (CP) was recommended by the consulting engineer as a possible solution to control the corrosion problem and prolong the life of the structure. Between 1987 and 1988, several trial CP systems were installed, to determine which system was the most effective in controlling reinforcing steel corrosion and to provide a budget estimate for installation of a permanent system.

Of the systems tested, a titanium anode ribbon in slots proved to be the most cost-effective system and had the best overall performance. Since 1989, over 345,000 sq ft (32,000 sq m) have been installed. Subsequent field surveys conducted by the engineer have indicated a high level of corrosion protection to the reinforcing steel, and the elimination of delamination growth.

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