When used as granular base course, certain Saskatchewan aggregates are not sufficiently stable to withstand the relatively few passes of construction equipment without undergoing severe deformation. To overcome this problem, low amounts of asphalt have been added to the inplace base course using compaction water as the medium. Uncertainties regarding the amounts of asphalt to be added for temporary stabilization led to a laboratory research program to evaluate the effects of small amounts of emulsified asphalt on residual and resilient stress-strain characteristics of aggregates subjected to repetitive axial loading. Five asphalt contents were evaluated for five plasticity indices under three principal triaxial stress ratios. The results indicated that low amounts of asphalt could not off-set the detrimental effects of high plasticity index on residual strain, resilient strain, and resilient modulus. Only after sufficient asphalt had been added to form continuous films between aggregate particles did beneficial effects begin to show, and this amount is regarded as an uneconomical treatment for the intended purpose. (the results are applicable only to the conditions of the study. Other effects, such as decreasing the permeability, which may occur from addition of low amounts of asphalt, and which may improve performance of a base course were not evaluated). /TRRL/

  • Corporate Authors:

    Saskatchewan Department of Highways and Transportation, Canada

    Government Administration Building
    Regina, Saskatchewan S4S OB1,   Canada 
  • Authors:
    • CULLEY, R W
  • Publication Date: 1974-3

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00133871
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada
  • Report/Paper Numbers: Technical Report 20 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Nov 9 1977 12:00AM