Consolidation of crushed rock salt: Part 1, Experimental results for dry salt analyzed using a hot-pressing model
Mechanical properties of granulated rock salt are of interest in the underground disposal of nuclear waste because native salt from the excavations will be used as part of the backfill around the waste packages and in storage rooms, shafts and other openings. Backfill properties will be important in controlling room closure rates and local permeability. To obtain data on instantaneous and time-dependent compaction of crushed salt, we have done tests to measure the compaction as a function of time, temperature and pressure. Tests were done for a range of temperatures from 21 to 100/degree/C and pressures from 1.72 to 21 MPa, under quasistatic and creep conditions. All tests were done under hydrostatic loading, and also under nominally dry conditions, which means the only water present was the approx.0.2% water content of the salt. We found that: (1) Volumetric creep consolidation under hydrostatic stress proceeds at a rate of approximately 0.01t/sup /minus/1/, where t is the time in seconds. Creep consolidation is a function of log(t) and is slow. (2) Consolidation is not very temperature dependent in the range 21/degree/C to 100/degree/C. (3) Results can be fit reasonably well by a model developed to describe isostatic hot-pressing. 42 refs., 14 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6560347
- Report Number(s):
- SAND-88-1469; ON: DE89005300
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
053000 -- Nuclear Fuels-- Environmental Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BACKFILLING
COMPARATIVE EVALUATIONS
CREEP
FIELD TESTS
GEOLOGIC DEPOSITS
HIGH-LEVEL RADIOACTIVE WASTES
MANAGEMENT
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTES
SALT DEPOSITS
TEMPERATURE DEPENDENCE
TESTING
TIME DEPENDENCE
UNDERGROUND DISPOSAL
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES