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Investigation into the Contributing Factors to the Corrosion of Steel Reinforced Concrete Structures at Elevations Greater than 12 Feet above the Mean High-Water Line
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2023-01-01
[PDF-11.44 MB]
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Edition:Final Report February 21, 2020 – January 25, 2023
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Abstract:The main objective of this project was to gain a better understanding and insight as to why corrosion takes place at elevations higher than 12 feet above the mean high-water line (>MHWL+12) for tall components that are part of the substructure (piles, columns, footers) of bridges that are partially immersed. There are several factors that influence corrosion initiation at these elevations. Proximity to the ocean, the predominant wind direction, and wind speed affect the amount of ocean spray that reaches the structure at these elevations. The duration of wind events with wind speed greater than or equal to 3 m/s has been reported (by Meira and others) as an important parameter that varies by location and season (and from year to year). For example, during the monitored period, there were a few instances in which the measured chloride deposition was significantly larger, and the magnitude of the chloride deposition measured was different from year to year, as well as during a given year. The months in which the deposition was larger appear to coincide with the months that had the larger number of hours per month in which the wind was ≥ 3 m/s based on measurements made at weather stations close to the sites where the wet candles were deployed. The geometry and orientation of the structure, as well as the surrounding detailing of the structure, can also play a significant role, particularly when the wind reaches a turbulent flow. The chlorides could reach inner columns that later are not wetted during rain events, but still exposed to high humidity for extended periods of time. The wind direction and rain intensity during rain events would dictate when and how much of the chlorides are washed out from the surface of outer elements.
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