SHALE IN AGGREGATES

DISCUSSION IS PRESENTED OF THE ORIGIN AND CHARACTERISTICS OF SHALE AND OF ITS METAMORPHOSED EQUIVALENTS, SLATE, PAYLITTLE AND SCHIST. CLAY IS DERIVED FROM THE WEATHERING OF IGNEOUS ROCKS AND OF SEDIMENTARY ROCKS, ESPECIALLY LIMESTONE AND SHALE. SHALE IS CONSOLIDATED CLAY. THE CHANGE IS ACCOMPANIED BY CRYSTALLIZATION, DEHYDRATION, AND CEMENTATION. THE PROCESS IS READILY REVERSED BY ALTERNATE WETTING AND DRYING. IN THE CHANGE FROM THE CLAY TO SCHIST THERE IS A PROGRESSIVE LOSS OF WATER AND CARBON DIOXIDE, AND AN INCREASE IN SILICA RESULTING IN ROCKS WHICH ARE RESISTANT TO WEATHERING. A COMPARISON OF THE SPECIFIC GRAVITY OF SHALE WITH THOSE OF OTHER ROCKS INDICATES DIFFICULTY IN EFFECTING COMPLETE SEPARATION OF SHALE IN GRAVEL BY ANY METHOD THAT DEPENDS UPON RELATIVE SPECIFIC GRAVITIES. /AUTHOR/

  • Supplemental Notes:
    • Vol 12, Pt 1, PP 265-272, 3 TAB, 14 REF
  • Authors:
    • Bean, E F
    • Lang, F C
    • Emmons, W J
    • Mattimore, H S
  • Publication Date: 1933

Media Info

  • Monograph Title: Proceedings of the Twelfth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 1-2, 1932. Part I: Reports of Research Committees and Papers
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217827
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 1 1971 12:00AM