Materials Performance

OCT 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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OCTOBER 2018 MATERIALSPERFORMANCE: VOL. 57, NO. 10 19 sacrificial system, which has a service life based on the amount of anodic materials it contains. Although his group has done some testing with ICCP systems and ICCP data retrieval systems have improved and now have the capability to remotely monitor and retrieve data, Sharp says the challenge is maintaining an ICCP system for the long term since periodic maintenance and inspections are required to keep the system operating. These techniques help to increase the service life and safety of older bridge structures as well as provide longer and longer service lives to new bridge structures, but there are other options that bridge owners can utilize when carrying out bridge repair and rehabilitation. Electrochemical chloride extraction removes chloride ions from contaminated concrete and reinstates the passivity of steel reinforcement. This is done by temporarily applying an electric field between the concrete reinforcing steel and an externally mounted anode. During the process, chloride levels are reduced and a high pH environment is created to return the steel reinforcement to a passive condition. Realkalization is a technique that elevates the alkalinity of carbonated concrete by applying an electric field between the concrete reinforcing steel and an external anode in an alkaline electrolyte. In the end, bridge owners use techniques for repair, rehabilitation, and new construction that make the most sense for their particular structure. One thing is certain, though. As we go into the future, the materials and tech- niques available now will help the nation's DOTs to achieve 100-year service lives (and probably longer) for their bridge structures. REF ERENCE S 1 "What is the National Highway System," National Highway System, U.S. Depart- ment of Transportation, Federal Highway Administration, https://www.fhwa. dot.gov/planning/national_highway_system (September 4, 2018). 2 Tables of Frequently Requested NBI Information, Bridge Condition by Year Built, 2017, U.S. Department of Transportation, Federal Highway Administration, https://www.fhwa.dot.gov/bridge/britab.cfm (September 4, 2018). 3 Tables of Frequently Requested NBI Information, Bridge Condition by Highway System, 2017, U.S. Department of Transportation, Federal Highway Administra- tion, https://www.fhwa.dot.gov/bridge/britab.cfm (September 4, 2018). 4 Tables of Frequently Requested NBI Information, Deficient Bridges by Highway System, 2017, U.S. Department of Transportation, Federal Highway Administra- tion, https://www.fhwa.dot.gov/bridge/britab.cfm (September 4, 2018). 5 K.R. Larsen, "Modern Corrosion Control Adds More Life to 83-Year-Old Bridge," MP 49, 11 (2010): pp. 26-31. 6 Tables of Frequently Requested NBI Information, Bridge Replacement Unit Costs, 2017, U.S. Department of Transportation, Federal Highway Administra- tion, https://www.fhwa.dot.gov/bridge/britab.cfm (September 4, 2018). 7 J. Garcia, "The Skyway Bridge—Yesterday, Today & Tomorrow," Florida Depart- ment of Transportation, Design Conference 2006, Session 20 (Tallahassee, FL: FDOT, 2006). 8 "2018 Prize Bridge Awards," Modern Steel Construction (June 2018). 9 NACE No. 12/AWS C2.23M/SSPC CS 23, "Specification for the Application of Thermal Spray Coatings (Metallizing) of Aluminum, Zinc, and Their Alloys and Composites for the Corrosion Protection of Steel" (Houston, TX: NACE Interna- tional, 2016). 10 O. Troconis de Rincón, et al., "Comparative Evaluation of Various Types of Metal- lic Coatings for Structural Steel in Marine Environments," CORROSION 2018, paper no. 10912 (Houston, TX: NACE, 2018). BIBL IO GR A PH Y Ailaney, R. "Bridge Preservation Guide, Maintaining a Resilient Infrastructure to Preserve Mobility." U.S. Department of Transportation, Federal Highway Administration, Publication No. FHWA-HIF-18-022, Spring 2018. Weingroff, R.F. "National Highway System: Imagining the Future." Highway History. U.S. Department of Transportation, Federal Highway Administra- tion. https://www.fhwa.dot.gov/infrastructure/nhsorigins.cfm. "Welcome to the Interstate 50th Anniversary Web Site." Highway History. U.S. Department of Transportation, Federal Highway Administration. https://www.fhwa.dot.gov/interstate/homepage.cfm. MP

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