EFFECT OF BINDER CHARACTERISTICS ON TENSILE PROPERTIES OF BITUMINOUS MIXTURES

Experiments were conducted, using acoustic emission techniques, on bituminous mixtures in indirect tension to measure tensile properties for use as indices of performance of mixtures containing conventional and modified binders with varying temperature susceptible characteristics. Parameters for this study included a single aggregate of 100 percent crushed limestone at one gradation, four binder types, eight temperatures and variable testing speed. Regression equations are presented that relate significant variables to limiting strain and limiting stiffness, the most significant by far being temperature. The results provide strong evidence that tensile characteristics of bituminous mixtures can be controlled by controlling the characteristics of the binders. Soft (nominal penetration grade of 200-250) asphalt, in comparison with 85-100 penetration materials, produces lower stiffness values of mixtures at low as well as high temperatures. Emulsification and air blowing are shown to be very viable methods for improving the temperature susceptibility of asphalt binders. Compared to the highly temperature susceptible Canadian asphalt, the high float emulsion residue made from the Canadian asphalt and the partially air blow asphalt produce lower stiffness values at lower temparatures and higher stiffness values at higher temperatures, thus providing improved performance at both ends of the temperature scale. Acoustic emission experiments showed that this technique is very effective in detecting crack initiation and in defining the failure point of bituminous mixtures at low temperatures. /Author/

  • Availability:
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284
  • Authors:
    • Khosla, N P
  • Publication Date: 1978-8-2

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 144 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188186
  • Record Type: Publication
  • Source Agency: Purdue University/Indiana Department of Transportation JHRP
  • ISBN: File 2-4-31
  • Report/Paper Numbers: JHRP-78-16 Final Rpt.
  • Files: TRIS, ATRI
  • Created Date: Mar 28 1979 12:00AM