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Concrete Pipe: Electrochemical Cell, Phase II: Final Report
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2016-08-01
[PDF-36.95 MB]
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TRIS Online Accession Number:01610889
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Edition:Final Report March 18, 2014 – August 26, 2016
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:The research was conducted to better understand the corrosion propagation stage on dry‐cast reinforced concrete pipes (RCP) while exposed to high moisture conditions and chlorides. The research had both a field component and laboratory components. Two types of dry‐cast reinforced concrete pipes were used in this investigation for the laboratory component. Ring specimens and segmented arch section specimens were instrumented. All specimens were subjected to accelerated chloride transport via an electric field. Corrosion of the steel wire mesh initiated after a few days to a few months rather than several years. The specimens were then transferred to high moisture environments (immersed in water, high humidity, and/or covered with wet sand) during the corrosion propagation stage. The corrosion activity was monitored using linear polarization resistance and electrochemical impedance spectroscopy measurements. The corrected polarization resistance (Rc) was calculated by subtracting the solution resistance from the apparent polarization resistance measured. The Rc values measured over time were used to obtain the calculated mass loss (using an integration method). Most specimens were forensically analyzed and the measured mass loss compared to the calculated mass loss. Field visits were also part of the project. Segments were obtained from sites on which the RCP had been removed. These segments were taken to the lab and forensically analyzed. Corrosion potentials were measured along selected longitudinal wires. After concrete removal, steel wire mesh showed corrosion on segments obtained from three of the visited sites. A second set of visited sites corresponded to sites in which the RCP continues to be in service while being exposed to an aggressive environment. Evidence was found that steel corrosion was ongoing – either visual (cracks or corrosion product bleed) or via corrosion potential measurements – at several of these sites that were exposed to wet and dry cycles.
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