Effects of long-term exposure of tuffs to high-level nuclear waste-repository conditions. Preliminary report
Tests have been performed to explore the effects of extended exposure of tuffs from the southwestern portion of the Nevada Test Site to temperatures and pressures similar to those that will be encountered in a high-level nuclear waste repository. Tuff samples ranging from highly welded, nonzeolitized to unwelded, highly zeolitized varieties were subjected to temperatures of 80, 120, and 180{sup 0}C; confining pressures of 9.7 and 19.7 MPa; and water-pore pressures of 0.5 to 19.7 MPa for durations of 2 to 6 months. The following basic properties were measured before and after exposure and compared: tensile strength, uniaxial compressive strength, grain density, porosity, mineralogy, permeability, thermal expansion, and thermal conductivity. Depending on rock type and exposure conditions, significant changes in ambient tensile strength, compressive strength, grain density, and porosity were measured. Mineralogic examination, permeability, and thermal property measurements remain to be completed.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 59135
- Report Number(s):
- LA-9174-PR; ON: DE82009549; TRN: 82:011511
- Resource Relation:
- Other Information: PBD: Feb 1982
- Country of Publication:
- United States
- Language:
- English
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RADIOACTIVE WASTE DISPOSAL
HIGH-LEVEL RADIOACTIVE WASTES
UNDERGROUND DISPOSAL
TUFF
FIELD TESTS
TEMPERATURE EFFECTS
MECHANICAL PROPERTIES
NEVADA TEST SITE
TENSILE PROPERTIES
COMPRESSION STRENGTH
GRAIN DENSITY
POROSITY
MINERALOGY
PERMEABILITY
THERMAL EXPANSION
BULK DENSITY
EXPERIMENTAL DATA
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