Manual on Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements (2006) / Chapter Skim
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Pages 37-43
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From page 37... ...
The preferred repair option will depend on the remaining service life. For example, if the remaining service life is greater than 20 years, the optimal solution most likely will be to continue with the regular maintenance, whereas if the remaining service life is between 10 years and 20 years, a corrosion control system may be an optimal choice because it provides an inexpensive barrier corrosion control system that controls the ingress of chloride ions and increases the remaining service life.
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From page 38... ...
SCHEDULE BRIDGE FOR REPAIR PERFORM SERVICE LIFE MODELING PERFORM IN-DEPTH EVALUATION PERFORM SERVICE LIFE MODELING & SI DESIGN REPAIR & CORROSION CONTROL SYSTE M PREPARE CONSTRUCTION DOCUMENT S CONSTRUCTION SELECT CORROSION CONTROL SYSTEM REVIEW SERVICE LIFE MODEL RESULTS FROM PREVIOUS PCCE PERFORM REGULAR MAINTENANCE AND ROUTINE INSPECTION S CORROSION OBSERVED DURING ROUTINE INSPECTION? NO YES Figure 4.
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From page 39... ...
The next step in the methodology should be selected on the basis of the recalculated remaining service life. Preliminary Corrosion Condition Evaluation (PCCE)
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From page 40... ...
Service Life Modeling and Susceptibility Index The clear concrete cover, visual and delamination surveys, and chloride profile data are used to model the service life of the concrete element. The model may need to be run for several chloride threshold values until there is a good agreement between the model-predicted damage and the total damage observed for all condition evaluations conducted on the element.
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From page 41... ...
CORROSION INHIBITORS CATHODIC PROTECTION & ELECTROCHEMICAL CHLORIDE EXTRACTION SEALERS MEMBRANES + OVERLAY EPOXY-COATED REBARS SYSTEM PATCH REPAIR DO NOTHING REPLACEMENT OVERLAYS REPLACEMENT PATCH REPAIR CATHODIC PROTECTION OVERLAY SERVES AS A CORROSION CONTROL WHEN REPLACEMENT IS MORE COST-EFFECTIVE NEW CONCRETE ELEMENT (CORROSION CONTROL CAN BE INCORPORATED INTO IT) TOP LAYER CONCRETE SEALERS, MEMBRANES, SI TOO HIGH FOR TOP CONCRETE LAYER OVERLAYS & OVERLAYS PLUS MEMBRANE REPAIR TYPES SI < 2 SI ≥ 2 SI ≥ 4 SI ≥ 5 SI ≥ 7 SI ≥ 8 Table 5.
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From page 42... ...
Service life extension by a corrosion control system depends on the corrosion condition of the structure, the exposure conditions, the applicability of that particular system to the condition of the structure, the quality of design and application of the system onto the structure, and the maintenance of the system after its application. Table 6 should be used only as a guideline; further information on the system of interest should be obtained prior to determining the obtainable service.
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From page 43... ...
Some pieces of electronic equipment most commonly used in condition evaluation can be affected by exposure to certain environments. In marine environments, certain electronic equipment will fail after several days of use because of exposure to chloride ions in the air.
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