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Assessment of corrosion-damaged concrete bridge decks-a case study investigation

The results of a comprehensive condition assessment of a decommissioned reinforced concrete bridge, which included both a field survey and laboratory tests are presented. The field survey included electro-chemical, chemical, physical and mechanical tests on the bridge deck, which was exposed to a corrosive environment for about 35 years. The experimental study focused on the investigation of the impact of concrete mix on corrosion and subsequently on the bond strength of concrete structures. The data collected from the field survey include measurements of concrete cover depth, chloride content, half-cell potential, electrical resistivity, and level of carbonation. These data shows a considerable level of variability in all parameters measured with coefficients of variation ranging from 34% for the concrete cover depth to 86% for the apparent chloride diffusion coefficient. A Monte Carlo simulation was undertaken to generate the distributions of the chloride content at the reinforcement level and corrosion initiation time for the deck. The simulations generated results that were very close to the field data. Partial results of the experimental study of the impact of corrosion on bond shows a quasi-linear decrease of the residual bond capacity with the mass loss of reinforcing steel.