ADDITIVES TO CONTROL SLAKING IN COMPACTED SHALES

The conventional manner of stabilization of nondurable shales is through degradation and compaction. However, if the shale is hard, this is extremely difficult to accomplish. This research tested the ability of certain inexpensive salts to modify the durability of slected Indiana shales. If the salt decreased the durability, it would be added prior to shale compaction; if the effect were vice versa, the slat could be added at the time of compaction. Mostly, the salts tried did not significantly affect the short term durability, although calcium sulfate, aluminum sulfate, ferrous sulfate, ferric chloride and sodium chloride were sometimes successful. Given the limited success of the salts, lime was tested for effect on the durability. 3% lime effectively increased the durability in the short term. Lime reactiveness increased with the exchangeable sodium percentage of the shale. No long term effects were studied, nor were the potential problems of mixing the additives with the shales in the field resolved. Further research will be required with respect to these questions. (FHWA)

  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284

    Indiana State Highway Commission

    Indianapolis, IN  USA  46204

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Surendra, M
  • Publication Date: 1980-5-14

Media Info

  • Pagination: 304 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331733
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IN/JHRP-80/6 Intrm Rpt.
  • Contract Numbers: 1(17) Part II
  • Files: TRIS, ATRI, USDOT
  • Created Date: Aug 15 1981 12:00AM