SYMPOSIA PAPER Published: 01 January 1997

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


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.

Author Information

Taha, RA
Montana State University, Bozeman, MT
Pradeep, MR
South Dakota State University, Brookings, SD
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Developed by Committee: D18
Pages: 172–180
DOI: 10.1520/STP15650S
ISBN-EB: 978-0-8031-5351-6
ISBN-13: 978-0-8031-2470-7