- Author
-
Qian, S.
|
Cusson, D.
- Title
- Field Performance of Corrosion Inhibiting Systems in Reinforced Concrete Bridge Barrier Walls.
- Coporate
- National Research Council of Canada, Ottawa, Ontario
- Report
-
NRCC-46436,
- Book or Conf
- Concrete Under Severe Conditions: Environment and Loading, 4th International Conference. Proceedings. June 27, 2004,
Seoul, Korea,
1423-1430 p.,
2004
- Keywords
-
bridges (structures)
|
reinforced concretes
|
corrosion
|
walls
|
inhibitors
|
structures
|
steels
|
exposure
- Identifiers
- generic description of corrosion-inhibiting systems tested; results of on-site corrosion surveys; comparison and ranking of performance of corrosion inhibiting systems
- Abstract
- Corrosion inhibitors have been considered as one of the most effective solutions to address the problem of corrosion of steel reinforcement in concrete structures. However, limited information is available on their actual field performance and cost-effectiveness. In this study, the field performance of nine commercially available corrosion-inhibiting systems for use in concrete were assessed on a newly reconstructed barrier wall on the Vachon Bridge near Montreal. These corrosion-inhibiting systems included concrete admixtures, reinforcing steel coatings, and/or concrete surface coatings/sealers. Special rebar ladders were embedded in the barrier wall to provide different thicknesses of the concrete cover for accelerated corrosion and rapid evaluation of the performance of the applied corrosion-inhibiting systems. On-site corrosion surveys, including half-cell potential and corrosion rate measurements, along with concrete coring were conducted yearly. Electrochemical tests on the performance of corrosion-inhibiting systems were also carried out in the laboratory. The results indicate that the system containing the inorganic-based admixture performed better than the other systems in delaying and/or reducing the corrosion of reinforcement in the concrete barrier wall.