Fly Ash as a Potential Waste Liner

by Tuncer B. Edil, Univ of Wisconsin, Madison, WI, USA,
Paul M. Berthouex, Univ of Wisconsin, Madison, WI, USA,
Kevin D. Vesperman, Univ of Wisconsin, Madison, WI, USA,

Document Type: Proceeding Paper

Part of: Geotechnical Practice for Waste Disposal '87


Earthen liners have been widely used to contain toxic and hazardous materials in ponds and landfills. There is close scrutiny over the durability of liners in contact with various wastes and a need for cost-effective alternatives with superior qualities. Fly ash and fly-ash stabilized soils present a significant potential as a resistant and cost-effective waste liner material. A series of tests was performed on fly ash and fly ash/sand mixtures to evaluate both the physical characteristics pertinent to containment of waste liquids and the chemical interactions with such liquids. Permeability, volume change, and mechanical properties were studied as a function of environmental exposure factors such as freeze/thaw cycles and wet/dry cycles. The influence of construction factors such as water content, compactive effort, and time between mixing water and compacting on density and permeability was considered. Permeability tests using inorganic salt solutions of various composition and pH also were made. A summary of the findings of this investigation is presented. The laboratory experiments indicate that pozzolanic fly ash has many properties that are attractive in a liner construction material.

Subject Headings: Fly ash | Linings | Chemical wastes | Recycling | Permeability (soil) | Waste containment | Soil stabilization

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