IS IT BENEFICIAL TO COAT REINFORCING BARS DURING CONCRETE REPAIRS?
When repairing deteriorated reinforced concrete structures, it is usually not feasible to remove existing bars and replace them with new bars. The exposed portions of the bars can be sandblasted clean and coated with a corrosion-protection coating in an effort to reduce ongoing corrosion activity. The effectiveness of these field-applied coatings, however, is not well-documented. Therefore, a research study was performed to evaluate field-applied coatings. Samples were obtained from a garage repair project in Chicago, Illinois. Ten-ft (3-m) lengths on two different bars were coated with each of the coating systems. Two 5-ft (1.5-m) sections of reinforcing bars with each coating system were then removed, cut into 1-ft (0.3-m) test samples, and sent to a laboratory for testing. The corrosion performance of the bar samples appears to depend on the number of coats of the material on the sample. The samples with two coats performed noticeably better than the samples with a single coat. The single coat materials all performed in a similar manner, with no large differences between the different coatings and an average reduction in corrosion current of almost 70%. The two-coat materials also performed in a similar manner, with an average reduction in corrosion current of 90%.
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Scranton Gillette Communications380 E Northwest Highway, Suite 200
Des Planes, IL United States 60016-2282
- Publication Date: 1999-9
- Features: Photos;
- Pagination: p. 76-77
- TRT Terms: Coatings; Corrosion protection; Corrosion resistance; Corrosion tests; Field studies; Laboratory tests; Reinforced concrete; Reinforcing bars; Samples
- Geographic Terms: Chicago (Illinois)
- Subject Areas: Geotechnology; Highways; Maintenance and Preservation; Materials; I34: Steels and Metals; I61: Equipment and Maintenance Methods;
- Accession Number: 00788820
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 3 2000 12:00AM