Evaluation of sprayed-on metalizing for precast prestressed concrete I-beams
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Evaluation of sprayed-on metalizing for precast prestressed concrete I-beams

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  • English
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    • Creators:
      Gawedzinski, Mark
    • Corporate Contributors:
      Illinois. Department of Transportation. Bureau of Materials and Physical Research
    • Subject/TRT Terms:
    • Publication/ Report Number:
      FHWA/IL/PRR-141
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      Illinois
    • Abstract:
      Cathodic protection has been used as an effective means of arresting corrosion in reinforced concrete. A galvanic system typically consists of a sacrificial anode, some form of adhesive or fastening system to secure the anode to the concrete, and a electrical connection between the anode and the corroded reinforcement. No external power or complex monitoring system is required. Galvanic systems are recognized for their simplicity and ability to operate with little or no maintenance for the life of the system. This research was conducted to evaluate ?sprayed-on? galvanic cathodic protection systems as a means of extending the life of precast prestressed concrete I-beams. By arresting corrosion, the galvanic system can extend the life of the

      prestressing strands and reinforcing steel, postponing or minimizing the need for repairing structural members of the bridge. The Illinois Department of Transportation, Bureau of Materials and Physical Research (IDOT BMPR) conducted an evaluation of three different types of zinc-based metals as anodes for galvanic cathodic protection.

      The anodes were ?metallized? onto the faces of several pre-cast, pre-stressed concrete I-beams of twin structures, west of Peoria, Illinois. This study was conducted to evaluate the metallizing process, and the different metals as anodes for consideration as alternative methods for galvanic cathodic protection. Evaluation

      of the three different types of ?spray on? anodes for galvanic cathodic protection indicate that the systems do not offer any improved amount of protection to the pre-stressing strands when compared to beams that were not treated. Results from the corrosion potential surveys indicate that the systems are not protecting the steel. It appears that the anodes do not develop enough current necessary to drive the ion exchange to arrest the corrosion process.

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