A STUDY OF PHYSICAL FACTORS AFFECTING THE DURABILITY OF ASPHALTIC PAVEMENTS - INTERIM REPORT IR-8

SUMMARY IS PRESENTED OF THE RESULTS OBTAINED TO DATE IN A CONTINUING STUDY OF THE FACTORS AFFECTING PAVEMENT DURABILITY. IN-SERVICE CHANGES IN MIXTURE AND ASPHALT PROPERTIES WERE DETERMINED AT VARIOUS SERVICE INTERVALS. THE PROPERTIES STUDIED ARE CONSISTENCY, DUCTILITY, CHEMICAL COMPOSITION (ROSTLER METHOD) OF ASPHALT, DENSITY AIR-VOIDS AND GRADATION OF THE MIXTURE. A TOTAL OF 13 PAVEMENTS IN THE FOLLOWING THREE GROUPS ARE BEING STUDIED: (1) TYPE OF ASPHALT AND AGGREGATE, (2) EVALUATION IS MADE OF THE EFFECT OF COMPOSITION CHANGES IN THE ASPHALTS DURING SERVICE AS RELATED TO THE PERFORMANCE OF THE PAVEMENTS, AND (3) STUDY IS MADE OF PENETRATION-VISCOSITY (AT 140 F). IT IS CONCLUDED PRINCIPALLY: (1) THAT ALL ASPHALTS MAY HAVE THE SAME PENETRATION-VISCOSITY (140 F) RELATIONSHIP, (2) PENETRATION, VISCOSITY AND ASPHALTENT CONTENT (OR THE MODIFIED ROSTLER PARAMETER) ARE THE BEST TEST PROPERTIES TO INDICATE ASPHALT HARDENING, (3) HIGH TRAFFIC VOLUME CONTRIBUTES TO HARDENING, AND (4) THE STATE'S MIXTURE DESIGN SHOULD INCLUDE A MAXIMUM PERMISSIBLE PERMEABILITY BECAUSE OF THE LATTER'S EFFECT ON BINDER HARDENING.

  • Supplemental Notes:
    • Hpr-1/4/, BPR-7
  • Corporate Authors:

    Pennsylvania Department of Highways

    400 North Street
    Harrisburg, PA  United States  17120-0095

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  United States  16802

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Gotolski, W H
    • Ciesielski, S K
    • Smith, R W
    • Kofalt, J A
  • Publication Date: 1967-9

Subject/Index Terms

Filing Info

  • Accession Number: 00206315
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jan 16 1994 12:00AM