Transport and geotechnical properties of porous media with applications to retorted oil shale. Volume 2. Appendix B. Compressibility and shear strength of unsaturated spent soil shale. [From Paraho, Tosco and Lurgi-Ruhgas methods]

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5845856

Madrid, L D

This research investigated the natural cementation and unsaturated consolidation characteristics of three samples of spent oil shale. The spent oil shale displayed compressibility characteristics typical of a granular material, exhibiting relatively small deformation as indicated by small values of the compression indices (C/sub c/ and c/sub t/). An increase in matrix suction desaturates the spent shale and causes additional deformations in the shale. Stress path dependency was evident in all samples which underwent compression in an unsaturated state. The void ratio, water content, and the degree of saturation will be a function of the stress history and the unsaturated stress state variables discussed in this thesis. An increase in compressive strength with time was obtained fro spent shales which were moistened, properly compacted and cured. Twenty-eight day strengths in the range of 1500 to 3000 psi are obtainable by moist curing mortars of portland cement mixed with spent oil shale. TOSCO spent shale exhibited the highest pozzolanic activity index and may be suitable for low strength grouts or cement. The degree of compaction can have a very pronounced effect on the strength gain of spent oil shale. Samples which are compacted above 90% maximum standard Proctor density will experience the most strength gain. Cementation was a result of a pozzolanic reaction within moistened spent oil shale. Calcium oxide hydrated in the presence of water and reacted with silicon dioxide in the shale to form C-S-H. Comentation was also a function of the degree of hydration of anhydrite and an unknown reaction involving MgO. 35 refs., 44 figs., 16 tabs.

• Research Organization: Colorado State Univ., Fort Collins (USA). Dept. of Civil Engineering
• DOE Contract Number: AC02-83ER60122
• OSTI ID: 5845856
• Report Number(s): DOE/ER/60122-3-Vol.2-App.B; ON: DE86012028
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040500* -- Oil Shales & Tar Sands-- Properties & Composition
040900 -- Oil Shales & Tar Sands-- Waste management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
BUILDING MATERIALS
CEMENTING
CEMENTS
CHEMICAL COMPOSITION
COHERENT SCATTERING
COMPACTING
COMPRESSIBILITY
COMPRESSION STRENGTH
DATA
DIFFRACTION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
OXYGEN COMPOUNDS
PORTLAND CEMENT
SCATTERING
SPENT SHALES
STRESSES
WASTE PRODUCT UTILIZATION
WATER
X-RAY DIFFRACTION