Data are presented (collected on Interstate 10 in Florida) which provide quantitative information on mean values of six variables that might be considered as precursors of performance. These are: percent aspahlt, percent voids, percent retained penetration, viscosity and shear susceptibility of recovered aspahlts. Recovered ore samples were inspected from pavements that showed good and poor performance as evaluated by cracking area and deflection measurements (at ages of 104 to 134 months) from a stretch of highway about 50 miles in length. The roadway evaluated consisted of a 12-inch stabilized subgrade, a 10.5-in. limerock base, 2-in. binder course and 1-in. weaning course. Asphalt content, bulk and maximum specific gravity were determined; penetration and viscosity were measured after recovery of asphalt cement. Analyses of variance (a 2-way analysis of wheelpaths, course level, and performance rating was made on 82 sets of data; four separate 2-way studies were made where either the course level separation or the wheelpath distinction was not made). Revealed that the percent asphalt differences for in-wheelpaths and between-wheelpaths is not significant for poor and good ratings; however, it did show a significant difference for poor and good ratings. The decrease in percent voids data in wheelpaths reflects the effect of compaction in service since differences in wheelpath and between wheelpaths were highly significant; the differences in poor and good ratings studied without separation by course were also at the significant level. The four variables, percent penetration retained, viscosity level, complex flow, or temperature susceptibility on the three-way test of variance showed little significant differences of wheelpath data, but highly significant differences at both the 2-course levels and for poor or good ratings on the 3-way tests. Viscosity data and temperature susceptibility of recovered asphalts show definite interactions for course level and ratings on both 3-way test and 2-way analysis. The deductions regarding the six variables as potential evaluators of performance were confirmed by statistical evaluation mechanisms acting in asphaltic concrete performance are discussed.

  • Supplemental Notes:
    • Proceedings of the meeting held in Houston, Texas, February 1973.
  • Corporate Authors:

    University of Minnesota, Minneapolis

    155 Experimental Engineering Building
    Minneapolis, MN  United States  55455
  • Authors:
    • Potts, C F
    • Schweyer, H E
    • Smith, L L
  • Conference:
  • Publication Date: 1973

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 564-588
  • Serial:
    • Volume: 42

Subject/Index Terms

Filing Info

  • Accession Number: 00127341
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 16 1975 12:00AM