Improved Test Methods and Practices for Characterizing Steel Corrosion Potential of Earthen Materials (2020) / Chapter Skim
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Pages 91-102
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83 Appendix B Details of Laboratory Measurements State Practices State transportation agencies (e.g., DOTs)
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84 Table B-2. Summary of resistivity tests, precision, and bias.
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85 Comparison of Different Resistivity Tests with AASHTO T-288 Table B-3. Statistics of resistivity test bias with respect to AASHTO T-288 (2016)
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86 Summary of Tests to Measure Salt Contents Table B-5 shows the summary of tests used in this research to determine sulfate and chloride contents. This table summarizes each test in terms of specimen preparation and precision COV (µcov and σcov)
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87 Summary of Tests to pH Table B-6 shows the summary of tests used in this research to determine pH of the aqueous solutions. This table summarizes each test in terms of specimen preparation, precision COV (µcov and σcov)
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88 Salt Contents Table B-7 is a summary of the samples with general descriptions of results from testing via the AASHTO and the Texas modified procedures. Results are described as 1)
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89 Results from testing coarse samples with less than 8 % passing a # 10 sieve via Tex-620-M (but not via AASHTO T-290 and 291) show low salt contents.
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90 with less than 25 percent passing a No. 10 sieve.
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91 For a degree of saturation equal to 100 percent, the resistivity of a saturated geomaterial (ρsgm) can be approximated as: 𝜌𝜌𝑐𝑐𝑔𝑔𝑠𝑠~ 𝜏𝜏𝑝𝑝𝑝𝑝 𝜅𝜅𝑝𝑝𝑝𝑝𝑛𝑛𝑔𝑔𝑠𝑠 (B-2)
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92 Tortuosity, τpw, which affects the current path through the soil, depends upon the material gradation, degree of saturation, and the particle shapes, angularity, size and packing/porosity. We assume that tortuosity is inherent to the material characterization as fines, fine sand, coarse sand or gravel.
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93 Figure B-3 depicts the trend of the bias considering results from Tex-129-M compared to those from AASHTO T-288. The scaling factor is determined from each sample and plotted along the x-axis.
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94 Figure B-3 Correlation of bias from Tex-129-M with respect to scaling parameter.
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