Key Royale bridge five year evaluation.
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Key Royale bridge five year evaluation.

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  • English

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    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;
    • Abstract:
      This report describes the design, construction, instrumentation, and five-year evaluation of the Key Royale Bridge substructure. The primary focus was the evaluation of the implementation of highly reactive supplementary cementitious materials (SCM) into the construction of the bridge piles. Four different SCM were used to create six different concrete mixtures; these were then used to construct the bridge and fender piles. This allowed monitoring under realistic exposure conditions in real time rather than performing accelerated corrosion testing in laboratory conditions. Corrosion sensors were embedded in the bridge piles for periodic monitoring; five years after placement, none of the remaining operable sensors indicated the presence of corrosion. Removable fender piles were also installed with the same mixtures as were used on the bridge piles and will be removed after 15-20 years of seawater exposure to be examined for ingress of chlorides and corrosion damage. Coring was performed on the fender piles to evaluate chloride ingress after 5 years of exposure. In addition, durability segments were constructed using the same concrete and prestressing strand as the fender piles. These segments were hung from the fender piles for consistent exposure conditions and instrumented with corrosion sensors and temperature sensors for long-term corrosion monitoring, although none of the remaining operable sensors indicate the presence of corrosion. These segments will be cored in the future for evaluating the chloride ion penetration and concrete hydration over time. Data gathered during the five years since the bridge was erected indicated that corrosion has not yet initiated in either bridge or fender piles. Electrical measurements were taken at selected intervals to assess the condition of the prestressing steel in the piles. Half-cell potential measurements of the pile prestressing steel were taken using a copper copper-sulfate reference electrode and indicated a very low probability that corrosion was occurring in the prestressing steel. As noted previously, embedded sensors in the bridge and fender piles provided no indication of corrosion activity.
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