Stabilized Fly Ash Cover for a Municipal Waste Landfillby William S. Almes, West Virginia Univ, Morgantown, United States,
John J. Bowders, Jr., West Virginia Univ, Morgantown, United States,
Abstract: The study reported herein and several recently related projects have been aimed at reducing the hydraulic conductivity of fly ash and physiochemically fixing any potential leachable metals. The goal is to produce a material that may be substituted for naturally low-permeability soils and used in the construction of seepage control barriers such as landfill liners or covers. In this study, fly ash has been admixed with one of several materials including: bentonite, lime, spent lime, scrubber sludge, fluidized bed ash, kaolinite, waste phosphatic clay, and a native clay. Hydraulic conductivities near 1.0 × 10-7 cm/s have been measured for the bentonite, native clay, and spent lime mixtures. Admixtures with high calcium contents produced a rigid materials deemed unacceptable for cover applications. Clay admixtures produced a flexible product. Refinements in mixture composition continue and a field demonstration is underway.
Subject Headings: Fly ash | Construction materials | Landfills | Clays | Material tests | Lime | Hydraulic conductivity | Seepage
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