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    The Use of Fly Ash-Stabilized Sand Mixtures as Capping Materials for Landfills

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    An investigation was made to study the suitability of using coal fly ash-stabilized sand mixtures as capping materials for sanitary landfills. Sand mixtures stabilized with 15 and 20 percent Class C fly ash were investigated. Compaction, permeability, unconfined compressive strength, freeze-thaw, and wet-dry tests were conducted on both mixtures. Results indicate that fly ash-stabilized sand blends can be used as capping materials in areas where fine-grained soils are not available. Data indicate that the 20% fly ash-stabilized sand mixture will yield a better performance than sand mixtures stabilized with 15% fly ash. Increased strength, reduced permeability, and increased resistance to freeze-thaw and wet-dry cycles are some of the benefits obtained by using the high fly ash content.


    fly ash, landfill, capping material, stabilization, permeability, freeze-thaw, wet-dry

    Author Information:

    Taha, RA
    Assistant Professor, Montana State University, Bozeman, MT

    Pradeep, MR
    Former Graduate Student, South Dakota State University, Brookings, SD

    Committee/Subcommittee: D18.15

    DOI: 10.1520/STP15650S