THE DEGRADATION OF ROADBASE AGGREGATES - TEST TRACK INVESTIGATIONS

NEDBRYTNINGSBENAEGENHETEN HOS BAERLAGERGRUS--FAELTFOERSOEK PAA PROVBANAN VID TYSTBERGA 1975

This is a test track study of roadbase gravel degradation. The test track was circular, radius 25 M, length of test sections 10 M. The roadbase gravel was graded, rolled and exposed to lorries. Samples for grading analysis were taken after various construction activities. Attempts to produce rock gravels of three various gradings were hampered as the differences in grading were small after laying. Lime mixing into the roadbase surface was carried out in order to study its effect on the wearing course. The investigation was made more difficult as the roadbase gravel separated strongly during laying. Brittle gneiss and porous slag were most affected by the lorries but these materials were the most open graded. Also the roadbase surface was most affected by the lorries. Yet, the roadbase gravels comply to the standards. Clay slate gravel was improved by mixing hydrated lime into the upper part of the roadbase. The slag binders had a minor effect on gravels of granite and gneiss. Two lorries of equal weight but different dynamic properties affected the gravel entirely differently. Bearing capacity measurements indicated that slag rock gravels were less influenced by the climate than natural gravels. /TRRL/

  • Corporate Authors:

    Swedish National Road and Transport Research Institute (VTI)

    Olaus Magnus vaeg 35
    Linkoeping,   Sweden  SE-581 95
  • Authors:
    • HOEBEDA, P
  • Publication Date: 1977

Language

  • Swedish

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 86 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00179896
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Report/Paper Numbers: VTI Report No. 63 Monograph
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM