STABILIZATION OF OKLAHOMA SHALES

Eight Oklahoma Shales representing regional characteristics but differing texturally and mineralogically were selected for stabilization studies. Of the various stabilizing agents used, it was found that 6% hydrated lime, 14% portland cement, and 25% flyash give optimum conditions by imparting acceptable strength levels to the shales. The degree of strength attained varies inversely with the plasticity of shales. On the basis of compressive strength, cyclic loading, and weatherability criteria cement is the most effective additive, flyash the least, and lime moderately effective. Combinations of the three stabilizing agents show that shales can be upgraded strengthwise when the three main stabilizing agents are used conjunctively; in fact, the data suggest that such uses are more economical and more promising. The addition of small amounts (less than 2%) of NaCl, CaCl2, NaOH, and Na2CO3 to the shales which have already been mixed with one of the main stabilizing agents, further enhances the stabilizing benification. With the exception of flyash stabilized shales, delayed compaction appears to produce an overall decrease in the compressive strength properties. Electron microscopic studies indicate that the voids of the stabilizing shales are reduced substantially compared to the raw shales and there is a direct relationship between void domain characteristics and stabilization effectiveness. Shales having higher void cross sectional areas show lower compressive strengths.

  • Supplemental Notes:
    • Sponsored in part by Federal Highway Administration, Oklahoma City, Okla. Oklahoma Div.
  • Corporate Authors:

    University of Oklahoma, Norman

    Office of Research Administration
    Norman, OK  United States  73019

    Oklahoma Department of Transportation

    Research and Development Division, 200 NE 21st Street
    Oklahoma City, OK  United States  73105

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Laguros, J G
    • Jha, K
  • Publication Date: 1977-12

Media Info

  • Pagination: 281 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00181394
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: OD0T-73-04-2 Final Rpt., ORA-158-602
  • Files: NTIS, TRIS, USDOT
  • Created Date: Oct 12 1979 12:00AM