DESIGN OF OPEN GRADED ASPHALT FRICTION COURSES

THIS NEW DESIGN TECHNIQUE IS OFFERED AS A LOGICAL APPROACH TO THE DESIGN OF OPEN-GRADED ASPHALT FRICTION OVERLAYS. THE CONCEPT USED IS THAT THE OPEN-GRADED FRICTION COURSE CONSISTS PREDOMINANTLY OF A NARROWLY-GRADED COARSE AGGREGATE FRACTION WITH A SUFFICIENTLY HIGH INTERSITIAL VOID CAPACITY TO PROVIDE FOR A RELATIVELY HIGH ASPHALT CONTENT, A HIGH AIR VOID CONTENT, AND A RELATIVELY SMALL FRACTION OF FINE AGGREGATE. THE COARSE AGGREGATE FRACTION PROVIDES THE STRUCTURE OF THE COMPOSITE MIXTURE WHILE THE FINE AGGREGATE FRACTION ACTS AS A FILLER AND IMPARTS A "CHOCKING ACTION" TO STABILIZE THE COARSE AGGREGATE. THE HIGH ASPHALT CONTENT PROVIDES FOR MIXTURE DURABILITY AND THE HIGH AIR VOID CONTENT PROVIDES FOR ADEQUATE SUBSURFACE WATER DRAINAGE. THE OVERALL SIMPLICITY OF THE METHODOLOGY AND THE LOW CAPITAL INVESTMENT IN REQUIRED LABORATORY EQUIPMENT CONTRIBUTES TO ITS SUITABILITY FOR ACCEPTANCE ON A NATIONAL LEVEL.

  • Supplemental Notes:
    • RPT NO FHWA-RD-74-2
  • Corporate Authors:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Smith, R W
    • Rice, J M
    • Spelman, S R
  • Publication Date: 1974-1

Media Info

  • Pagination: 43 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00211887
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: May 15 1974 12:00AM