Stabilized Fly Ash for Use as Low-Permeability Barriers

Abstract

Two class F fly ashes from power stations located in West Virginia were stabilized by adding various percentages (by weight) of either lime or cement. Test specimens were subjected to compaction, unconfined compression, vacuum saturation durability and hydraulic conductivity tests. Results from the testing showed that adequate strength and durability can be achieved with sufficient stabilizer contents and curing. Hydraulic conductivity decreased with increasing amounts of stabilizer. The findings suggest that stabilized fly ash could serve as an alternative to clay soils in seepage cut-off applications in earthdams, impoundment liners, and landfill liners.