SHEAR-BOX TESTS ON GRADED AGGREGATES

As part of an investigation into the mechanical properties of aggregates to develop a rational classification system, shear-box tests have been carried out on typical, graded, road aggregates at normal stresses up to 1 MN/m2. Non-linear relations were found between peak shear stress and normal stress, with shear strengths of various aggregate types converging at higher levels of normal stress; however an arbitrary index based on logarithmic plots of the results has been developed to allow the comparison of shear strength of aggregates over a range of normal stress. The effects of aggregate type, degree of compaction, grading and moisture content upon shear strength have been quantified by correlating proportional changes in dry density produced by these variables, with proportional changes in the tangent of the angle of shearing resistance. The next stage of the work will be to apply these findings to the solution of practical engineering problems: a series of pilot-scale trials to investigate the stability of unbound sub-bases has been started.

  • Corporate Authors:

    Transport and Road Research Laboratory

    Environment Division, Old Wokingham Road
    Crowthorne RG11 6AU, Berkshire,   England 
  • Authors:
    • Pike, D C
  • Publication Date: 1973

Media Info

  • Features: Photos; References; Tables;
  • Pagination: 39 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00265321
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Report/Paper Numbers: TRRL LR 584
  • Files: TRIS, ATRI
  • Created Date: Feb 11 1975 12:00AM