Non-durable but mechanically hard shales pose a particular problem in embankment construction. These shales should ordinarily be degraded and compacted in relatively thin "soil" lifts. However, this may be difficult to accomplish because of the shale hardness. The engineer obviously needs to anticipate the difficulty of degrading the shale during construction, and this research has produced a simple standard test for such prediction. The standard AASHTO impact type test can be used to generate compaction relationships and degradability measures simultaneously. The shale gradation before and after compaction is used to generate an index of crushing. Degradation varies directly with this index. It may utimately be possible to use the more simple point load strength test to accomplish the prediction. This report shows good correlation between the secant modulus in the point load strength test and the index of crushing. (FHWA)

  • Supplemental Notes:
    • Conducted in cooperation with the Department of Transportation, Federal Highway Administration. From the study titled "Design and Construction Guidelines for Shale Embankments".
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

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

    Indiana State Highway Commission

    Indianapolis, IN  United States  46204
  • Authors:
    • Hale, B C
  • Publication Date: 1979-10-23

Media Info

  • Pagination: 180 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00319124
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-IN-JHRP-79-21 Intrm Rpt.
  • Contract Numbers: 1(17) Part II
  • Files: TRIS, ATRI
  • Created Date: Nov 19 1980 12:00AM