United States Department of Transportation
i
Impact of Deicing Salts on Corrosion Rates of MSE Reinforcement – Phase 1
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2019-11-20
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[PDF-3.33 MB]
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Edition:Final Report June 2016 – August 2019
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Abstract:This research involved a detailed laboratory study of available test procedures for evaluating corrosive potential of granular MSE backfill. The research examined standard AASHTO and ASTM test procedures that are widely used in current practice as well as several new test procedures that aim to overcome the limitations in the existing test procedures. Special emphasis was placed on electrical resistivities of the material under fully saturated conditions and the pore solution extract. A new test device, INA219 was developed and used throughout the test series so that continuous data collection and recording couldbe achieved. The experimental program included MSE backfill material obtained from three different local sources. Two separate gradations, i.e. AASHTO standard gradation and AASHTO No.57 gradation, of each source were included in the test program. In addition, tests were also performed on glass beads with three different sizes. The key findings from the SPTC Project 14.6-36: Phase I are as follows: (a) a new empirical relationship was established between the electrical resistivity of the pore solution extract and that of the saturated bulk material. This relationship can be used to estimate the electrical resistivity of MSE backfill with large particles when the material porosity is known, (b) The minimum electrical resistivity of saturated backfill varies significantly with elapsed time. This effect was particularly noticeable in MSE backfill with coarse gradation. Such material typically required 15hrs before the resistivity stabilized and reached its minimum value.
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