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    Stabilization of marginal soils using geofibers and nontraditional additives

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    Author
    Collins, Rodney Wotherspoon
    Keyword
    soil stabilization
    Alaska
    Metadata
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    URI
    http://hdl.handle.net/11122/11332
    Abstract
    Western Alaska lacks gravel suitable for construction of roads and airports. As a result, gravel is imported, at a cost of between $200 and $600 per cubic yard, to fill transportation construction needs. In an effort to reduce these costs, the Alaska University Transportation Center (AUTO) began searching for methods to use local materials in lieu of imported gravel. The approach discussed in this thesis uses geofibers and chemical additives to achieve soil stabilization. Geofibers and chemical additives are commercially available products. The goal of the research presented in this thesis is to test the impact of addition of two geofiber types, six chemical additives, and combinations of geofibers with chemical additives on a wide variety of soil types. California Bearing Ratio (CBR) testing was used to measure the effectiveness of the treatments. Soils ranging from poorly graded sand (SP) to low plasticity silt (ML) were all effectively stabilized using geofibers, chemical additives, or a combination of the two. Through the research conducted a new method of soil stabilization was developed which makes use of curing accelerators in combination with chemical additives. This method produced CBR values above 300 for poorly graded sand after a seven day cure.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2011
    Table of Contents
    1. Introduction -- 2. Literature review -- 3. Testing methodology -- 4. Stabilization of Ottawa sand -- 5. Effects of geofiber improvement on Ottawa sand at varying fines content -- 6. Stabilization of Monterey sand with geofibers and Earth Armor -- 7. Geofiber improvement of Monterey Sand with varying fines content -- 8. Stabilization of Fairbanks Silt using geofibers and chemical additives -- 9. Stabilization of Horseshoe Lake sand using geofibers and chemical additives -- 10. PolyCure in combination with polymer emulsions for soil stabilization -- 11. Summary, conclusions and recommendations for future research -- Bibliography -- Appendix.
    Date
    2011-08
    Type
    Thesis
    Collections
    Engineering

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