SECONDARY MINERALS IN ROCK AS A CAUSE OF PAVEMENT AND BASE FAILURE

SECONDARY OR ALTERATION MINERALS WERE FOUND IN LARGE PERCENTAGES IN THE ROCK USED IN BASE AND PAVEMENT OF SEVERAL HIGHWAY SECTIONS WHICH FAILED UNDER USE. THE MOST COMMON OF THESE ARE KAOLIN CLAYS, CHLORITE, SERPENTINE, CALCITE, AND LIMONITE. THEIR PRESENCE CAUSES ROCK IN THE 3/4- TO 0-INCH SIZE TO DISINTEGRATE OR DISSOLVE WHEN SUBJECTED TO WATER AND TRAFFIC LOADS. ROCK IN LARGER SIZES DOES NOT SEEM TO BE AFFECTED, PROBABLY BECAUSE OF THE SHARP DECREASE IN SURFACE AREA. MICROSCOPIC STUDY AND FIELD DATA INDICATE 0 TO 20 PERCENT OF SECONDARY MINERALS IN A FINE AGGREGATE WILL HAVE LITTLE EFFECT; 20 TO 35 PERCENT WILL PRODUCE SOME FAILURES AND BORDERLINE RESULTS; AND 35 PERCENT AND ABOVE WILL ALMOST CERTAINLY CAUSE FAILURES. /AUTHOR/

  • Supplemental Notes:
    • Vol 34, pp 412-417, 1 FIG, 1 TAB
  • Authors:
    • Scott, L E
  • Publication Date: 1955

Media Info

  • Monograph Title: Proceedings of the Thirty-Fourth Annual Meeting of the Highway Research Board, Washington, D.C., January 11-14, 1955
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217882
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 5 1972 12:00AM