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    Testing Aggregate Backfill for Corrosion Potential

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    Brady_ku_0099M_14551_DATA_1.pdf (2.113Mb)
    Issue Date
    2016-05-31
    Author
    Brady, Zachary
    Publisher
    University of Kansas
    Format
    73 pages
    Type
    Thesis
    Degree Level
    M.S.
    Discipline
    Civil, Environmental & Architectural Engineering
    Rights
    Copyright held by the author.
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    Abstract
    The Kansas Department of Transportation (KDOT) has designed and constructed numerous mechanically stabilized earth (MSE) walls to support new and expanded highway projects throughout Kansas. MSE walls often contain galvanized steel strips as mechanical reinforcement within layers of specified backfill material. Inclusion of these strips creates a stronger composite material connected to a visually appealing wall facing, however galvanized steel reinforcement is potentially vulnerable to corrosion. Corrosivity of MSE backfill is typically characterized using electrical resistivity among other properties. KDOT currently uses the American Association of State Highway and Transportation Officials (AASHTO) standard T 288 to calculate the resistivity of MSE backfill. There is concern that this method may not reflect field conditions well, and thus may mischaracterize the corrosivity of backfill. AASHTO T 288 tests were conducted as a part of this research, and the condition of these samples during testing was not consistent with expected field conditions. A new procedure has been proposed to ASTM that appears to more accurately simulate field conditions behind MSE walls. This ASTM C XXX-XX (the New ASTM) has been extensively tested and compared with AASHTO T 288 in this experimental study. The New ASTM simulated expected field conditions more accurately than the AASHTO test. Results also appear to indicate the need for a larger resistivity box to accurately characterize the corrosivity of larger aggregates. Preliminary recommendations for box geometry are 8:1 minimum electrode spacing to maximum particle size and 3:1 minimum height to maximum particle size. It was also observed that increasing the number of soak/drain cycles of the material resulted in a substantial increase in resistivity values that plateaued at a higher value than observed for both the AASHTO and proposed ASTM methods.
    URI
    http://hdl.handle.net/1808/21975
    Collections
    • Engineering Dissertations and Theses [1055]
    • Theses [3824]

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    785-864-8983
    KU Libraries
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    785-864-8983

    KU Libraries
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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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