The assessment of recently failed externalpost-tensioned tendons from a Florida bridge provided insight on the conditions that led to the failure. The corrosion was attributed to the presence of segregated grout, characterized by high moisture content and enhanced sulfate concentrations. Accelerated corrosion was caused by macrocell coupling of heal anodes in the strand and extended cathodes throughout the tendon. Differential aeration, vastly different moisture contents, and crevices caused corrosion failure within a short timeframe.
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