Investigation of Variations in Corrosion Potential in Mechanically Stabilized Earth Backfill Due to Migration of Fines

Identification of aggregates that present minimal corrosion risk, even if the fines become concentrated, or, as an alternative, identifying favorable gradations that prevent migration of fines, could extend the life of new MSE structures and limit repair and rehabilitation costs. KDOT currently has a 5000/3000 ohm-cm minimum standard for the resistivity of aggregate backfill used for mechanically stabilized earth (MSE) walls. During a recent study on the applicability of the AASHTO T 288 resistivity test, KU found that resistivity of aggregate is not a fixed value, but that it may change as precipitation filters through the aggregate. For many cases this can be good as the “washing” of the aggregate can result in a cleaner backfill and increased resistivity (less corrosion potential). However, if the reduction in resistivity is caused by the “washing” of fines, those fines have to go somewhere and may be deposited and concentrated at the base of the fill. There is a need to confirm that aggregates are being specified that will not present a corrosion concern even if the fines become concentrated. It would also be beneficial to identify gradations that prevent the internal migration and concentration of fines.

    Project

    • Status: Active
    • Funding: $64,617
    • Sponsor Organizations:

      University of Kansas, Lawrence

      Department of Civil Engineering, 2006 Learned Hall
      Lawrence, KS  United States  66045-2225
    • Managing Organizations:

      Kansas Department of Transportation

      Eisenhower State Office Building
      700 SW Harrison Street
      Topeka, KS  United States  66603-3754
    • Project Managers:

      Metheny, Luke

    • Performing Organizations:

      University of Kansas, Lawrence

      Department of Civil Engineering, 2006 Learned Hall
      Lawrence, KS  United States  66045-2225
    • Principal Investigators:

      Parsons, Robert

      Han, Jie

    • Start Date: 20170701
    • Expected Completion Date: 20181231
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01662455
    • Record Type: Research project
    • Source Agency: Kansas Department of Transportation
    • Files: RiP, STATEDOT
    • Created Date: Mar 8 2018 1:33PM