Permeability of fly ash and fly ash stabilized soils. Final report on highway research project no. 47

Technical Report · Wed Dec 01 04:00:00 EST 1976

OSTI ID:7320618

Parker, D G; Thornton, S I

Fly ash, a pozzolanic by-product of coal burning power plants, is an abundant potential source of highway and embankment construction material. Some fly ashes are suitable for use as a supplement or replacement for lime and portland cement in soil stabilization applications. The following conclusions are based on the results of a study using a fly ash produced from Wyoming low sulfur coal and two Arkansas soils. (1) Addition of fly ash to clay or sand reduces the permeability. The fly ash was more effective in reducing the permeability of sand (permeability reduced three orders of magnitude at 50% fly ash) than in clay (reduced by a factor of 4 at 50% fly ash). (2) Permeability does not vary greatly with time. (3) Increased compactive effort increases density and reduces permeability in soils. However, reduction in permeability due to increased compactive effort are usually small. (4) The permeability of fly ash, placed in a slurry, varies between 0.0001 cm/sec and 0.000001 cm/sec depending on the amount of water in the slurry. (5) Fly ash placed dry, then saturated, developed shrinkage cracks which created secondary permeability.

• Research Organization: Arkansas Univ., Fayetteville (USA). Dept. of Civil Engineering
• OSTI ID: 7320618
• Report Number(s): PB-265229
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
BUILDING MATERIALS
FLY ASH
FOSSIL-FUEL POWER PLANTS
MATERIALS
PERMEABILITY
POWER PLANTS
ROADS
SAND
SOILS
STABILITY
THERMAL POWER PLANTS
USES
WASTES