Maintenance, Repair & Rehabilitation of Concrete BridgesâWinter ...

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with the epoxy-coated reinforcement and are connected backto the reinforcing steel in the existing abutment. Then amonolithic concrete placement encases the anodes and fills inthe repaired areas.This solution has been used for several years and offersseveral advantages, including the short time required forthis comprehensive repair and future protection. Monitoredlocations indicate that the anode strips will provide over 20years of protection, but this can be adjusted by changing theamount of zinc provided or the anode spacing.This approach also provides an inexpensive repair method. Atthe time of repair of the Kirkwood Bridge, located near Sidney,Ohio, rehabilitating the abutment with anode strips costapproximately $319,000. To replace the abutment and providetemporary shoring cost about $427,000, while replacing theentire structure cost about $4.5 million.The program has worked so well that it has been extended toother concrete structures. The anode strips have been used ineight bridge deck overlays in a Lake County, Ohio, project, aswell as to protect columns with reinforced concrete jackets,pier-cap repairs, and pile protection in marine structures. TheOhio DOT projects continue to be monitored to ensure therepairs are performing as expected.This article is based on a presentation produced by Brad Lightle,director of Planning for District 7 of the Ohio Department ofTransportation, and Chris Ball, vice president of Vector CorrosionTechnologies, Tampa, Fla.Innovative Cost-Effective ProductsFrom a Company You TrustFabric RepairsHistoric Archesby Stacie L. Dovalovsky, Clark Dietz Inc.As the City of Kankakee, Ill., has grown, so too has its needfor improved infrastructure to handle the increased traffic.Updating the Station Street Bridge, built in 1924, requiredcareful consideration and planning to ensure its historicappearance was not altered. To achieve this goal, E-glassreinforcing fabric was used to confine the concrete in thebridge’s arches and to provide protection from the weather.LENTON ® Taper-Threaded Couplers are some of the mostwidely used mechanical rebar splices in the world today.*LENTON ® Concrete Reinforcement Products arespecified in projects worldwide to reduce congestionand speed installation. Cost-effective LENTONproducts from ERICO ® provide reliable performance.* LENTON and LENTON LOCK Couplers meet or exceed the requirements of IBC ® , UBC ® ,ACI ® 318 Type 2, DIN 1045 and BS8110.www.erico.comACI is a registered trademark of the American Concrete Institute. International BuildingCode (IBC) is a registered trademark of the International Code Council. UBC (Uniform BuildingCode) is a registered trademark of the International Conference of Building Officials.The 379-ft-long bridge, listed on the Illinois Historic BridgeList and eligible for the National Register of Historic Places,crosses the Kankakee River with five cast-in-place concrete,open-spandrel arches. Built to carry 1920s-era vehicles andstreetcar tracks, it now carries nearly 7000 vehicles every day.The bridge’s historic status limited the options for repairing thesubstructure and superstructure to meet today’s needs.The deck and spandrel columns had been replaced in 1978, butthe arches had received little attention and were in dire needof repair. City officials had three key goals: bringing the projectin on time, on budget, and with little disruption to the bridge’sappearance. The use of fiber-reinforced polymer compositewrappings for the arches helped to achieve all these goals.42 | ASPIRE, Winter 2009
MAINTENANCE, REPAIR, AND REHABILITATION of concrete bridgesThe 379-ft-long Station Street Bridge inKankakee, Ill., had its five cast-in-placeconcrete, open-spandrel arches repairedwith fiber-reinforced polymer compositewrappings. The repair was accomplishedfor less than original cost estimates.After careful consideration of optionsand selection of the best type ofwrappings, a detailed analysis of thearches was performed to determinethe potential construction sequence.Before the arches could be wrapped,deteriorated concrete had to be removedand replaced. But if too much of thecross-section of the arch was removed,it could fail under the weight of thesuperstructure’s dead load.Conventionally formed concrete andshotcrete were used for repairs, afterwhich the arches were wrapped withthe fiber-reinforced polymer composite.They were then painted to protect thecomposites and to give the repairedconcrete a like-new appearance. Toprovide a consistent look to the entirebridge, the existing concrete not wrappedwas painted to match the repairedsubstructure. All work on the bridgewas performed under the direction ofthe prime contractor, Kankakee ValleyConstruction, Kankakee, Ill.The fabric had been used in Illinois tostrengthen existing columns in highseismicareas, but it had not been usedbefore to strengthen a spandrel archbridge. Initially, engineering estimateshad limited the project to wrappingonly the two exterior arches, whichwere significantly more deteriorated.However, the low bid also allowedthe center arch to be wrapped andthe project to be completed for $1.9million or $600,000 below the originalestimate.The reinforcing fabric improves thestructural integrity of the arches byconfining the concrete, providingprotection from the weather, andpreventing future spalling. Mostimportantly, this approach preservedthe bridge’s historic appearance. Itgives the city a virtually maintenancefreestructure for the next 20 to 25years. Much of the material used onthe project was supplied by Sika Corp.,Lyndhurst, N.J.To further enhance the project’shistory, the existing IDOT-standard lightpoles placed on the sidewalks duringthe 1978 repairs were replaced withhistorical period lighting. The new lightpoles were located on the back of theparapets and out of the sidewalks.Special cantilever pedestals weredesigned for the new lighting; thereby,improving driver and pedestrian safety.The lighting ties into the city’s masterlighting plan and allows for futureexpansion of the period lightingthroughout the neighborhood.Planning for the future is a key goalthroughout Kankakee, especially forits infrastructure needs. This projectprovides a new way to meet those needswhile retaining the city’s historic charmand improving safety at the same time.More detail can be found in the article,“Station Street Repair” published in ICRIConcrete Repair Bulletin, July/August2008._____________Stacie L. Dovalovsky, is a project managerwith Clark Dietz Inc. in Chicago, Ill.The arches on the bridge, which is listed on the Illinois HistoricBridge List and eligible for the National Register of HistoricPlaces, needed to be repaired so that its historic nature was notdisturbed.The contractor’s low bid on the project allowed city officialsto extend the wrapping work to include the center arch andstill have the total cost come in below the original engineeringestimate.ASPIRE, Winter 2009 | 43
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