Improved Test Methods and Practices for Characterizing Steel Corrosion Potential of Earthen Materials (2020) / Chapter Skim
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1 SUMMARY Study Purpose NCHRP Project 21-11 aims to assess and improve the current methods for characterizing the steel corrosion potential of earthen materials. Electrochemical properties of earthen materials such as electrical resistivity, pH, salt concentrations, and organic contents are commonly used to characterize the corrosion potential of buried metal elements that are in direct contact with the surrounding soil.
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2 We documented performance data (i.e., corrosion rates) of plain and galvanized steel specimens, embedded in 19 of these sources.
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3 Precision and Bias Resistivity • The best precisions are observed from Tex-620-J (2005)
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4 • Biases from tests on the leachates are all greater than one, even for samples that are separated into finer components (e.g., for Tex-620-J (2005) the sample is separated on a No.
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5 grading number (GN) and the percentage passing the No.
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6 Organization of the Report NCHRP Project 21-11 aims to assess and improve the current methods for characterizing the steel corrosion potential of earthen materials. The main goal of this research is to develop test protocols to promote characterization of corrosion potential for earthen materials consistent with in-service conditions and observations of field performance.
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