United States Department of Transportation
i
Field Evaluation of Corrosion of Reinforced Concrete Structures in Marine Environment
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2000-06-01
[PDF-5.53 MB]
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Abstract:Eight sites were selected for field evaluation in cooperation with the Harbors Division of the Hawaii Department of Transportation. Seven of the sites used a calcium nitrite based admixture as a corrosion inhibitor. The eighth site used epoxy coated reinforcing steel to combat corrosion. Each site was tested for permeability, chloride ion concentration, half-cell potential, polarization resistance, resistivity, and pH. Corrosion activity identified by the half-cell potential measurements, polarization resistance measurements, and visual inspection of bars taken from cores indicated that high dosages of calcium nitrite (4.0 to 4.5 gal/yd³) provided the steel with significantly greater protection than lower dosages (2.5 gal/yd³). Visual inspection of epoxy coated bars taken from cores also demonstrated that the epoxy coating effectively protected the steel. Resistivity measurements often contradicted the results from the half-cell potential and polarization resistance tests. However, visual inspections supported the half-cell and polarization resistance tests, indicating that the resistivity measurements were erroneous.
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