Ten-Year Field Evaluation of Corrosion-Inhibiting Systems in Concrete Bridge Barrier Walls

The authors examine a decade-long field assessment of the performance of eight commercial corrosion-inhibiting systems on a high bridge's reinforced concrete barrier walls, where the bridge was subjected to severe environmental conditions. Concrete surface coatings/sealers, reinforcement coatings, and anticorrosion concrete admixtures, alone or in combination, comprised these systems. Field evaluation consisted of concrete core testing and visual inspections, as well as annual corrosion potential and corrosion rate surveys. Due to an initially high-quality concrete, the main barrier wall reinforcement after ten years, at a 75 mm (3 in.) depth, was found to be in relatively good condition. For all systems, signs of advanced corrosion were shown in special bars embedded in the barrier walls at a depth of 13 mm (1/2 in.); however, on 25 mm (1 in.) deep bars, no visible signs of corrosion were found. That consistently lower corrosion risks were provided by the system containing the inorganic anticorrosion admixture, followed by organic anticorrosion admixture containing systems, was shown through nondestructive corrosion evaluation over the 25 mm (1 in.) deep ladder reinforcing bars, in comparison to other systems, including the control. Observed differences in system effectiveness may be explained by low concrete permeability and different stability of the protective layer forming on the bars.


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  • Accession Number: 01131423
  • Record Type: Publication
  • Report/Paper Numbers: 106-M34
  • Files: TRIS
  • Created Date: Jun 30 2009 8:32AM