Performance of asphalt and clay liners as a uranium mill tailings leachate barrier

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6275249

Buelt, J; Barnes, S

Pacific Northwest Laboratory is evaluating the long-term effectiveness of various asphalt clay liner materials as a radionuclide and process chemical barrier from uranium mill tailings. A field test is being conducted by monitoring asphalt and clay liners installed at the Grand Junction, Colorado tailings site. In addition, eight prospective liners have undergone three months exposure to accelerated conditions to predict their behavior over a 1000-year period. High-calcium leachates have been forced through thin layers of clay to determine the ability of the clay to resist ion exchange, which reduces its swelling capabilities. Asphalt liners have been exposed to elevated temperatures and increased strengths of oxidizing agents to accelerate their aging process. The permeability coefficients measured during this exposure were then used to predict each liners stability with time. The analyses thus far show that clay soils with bentonite amendments and most asphalt compositions have good long-term performance characteristics.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6275249
• Report Number(s): PNL-SA-9637; ON: DE81029160
• Country of Publication: United States
• Language: English

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ALKALINE EARTH METALS
ASPHALTS
BITUMENS
CALCIUM
CLAYS
DISPERSIONS
ELEMENTS
FEED MATERIALS PLANTS
FIELD TESTS
INDUSTRIAL PLANTS
ION EXCHANGE
LEACHATES
LINERS
METALS
MILL TAILINGS
MIXTURES
NUCLEAR FACILITIES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PERFORMANCE TESTING
PERMEABILITY
PHYSICAL PROTECTION DEVICES
SOLID WASTES
SOLUTIONS
STABILITY
TAILINGS
TAR
TEMPERATURE EFFECTS
TESTING
WASTES