THE EFFECT OF CHARACTERISTICS OF ASPHALTS ON PHYSICAL PROPERTIES OF BITUMINOUS MIXTURES

LABORATORY TESTS ON A PARTICULAR BITUMINOUS MIXTURE AND A REVIEW OF OTHER INVESTIGATIONS OF THE PHYSICAL PROPERTIES OF BITUMINOUS MIXTURES INDICATE THAT THESE PROPERTIES CAN BE CORRELATED BEFORE AND AFTER ACCELERATED WEATHERING WITH THE CHARACTERISTICS OF THE CONTAINED BINDER. CHANGES OCCURRING IN THE BINDERS OF ASPHALTIC MIXTURES THAT INFLUENCE THE DURABILITY OF PAVEMENTS UNDER SERVICE CONDITIONS CAN BE MEASURED DIRECTLY BY TESTS ON THE BITUMEN RECOVERED FROM THE MIXTURES, OR INDIRECTLY BY THE CHANGES IN THE PHYSICAL PROPERTIES OF THE MIXTURES. CONCLUSIONS DRAWN FROM THIS STUDY THAT ARE APPLICABLE TO THE RESISTANCE TO CRACKING OF BITUMINOUS MIXTURES ARE: (1) THE PHYSICAL PROPERTIES OF A GIVEN MIXTURE ARE DEPENDENT UPON THE CONSISTENCY OF THE ASPHALT AT THE TEST TEMPERATURE, (2) TEST DATA FROM OTHER INVESTIGATIONS INDICATE THAT THERE ARE SOME CHARACTERISTICS OF ASPHALT WHICH CAUSE COMPARABLE MIXTURES PREPARED WITH DIFFERENT ASPHALT TO VARY IN PHYSICAL PROPERTIES EVEN WHEN THE CONTAINED ASPHALTS ARE OF THE SAME CONSISTENCY, (3) BITUMENS OBTAINED FROM PAVEMENTS OF THE TYPE THAT TEND TO CRACK USUALLY HAVE LOW PENETRATIONS AND DUCTILITIES AT 77 F, AND (4) THE DURABILITY OF ASPHALTIC PAVEMENTS AS INFLUENCED BY THE CONSISTENCY OF THE ASPHALT DEPENDS UPON THE CLIMATIC ENVIRONMENT IN WHICH THEY ARE LOCATED. THE CRITICAL PENETRATION OF THE BITUMENS AT 77 F AT WHICH PAVEMENT CRACKING OCCURS IS HIGHER IN COLD CLIMATES THAN IN WARM CLIMATES.

  • Availability:
  • Supplemental Notes:
    • Vol 25, No 5, PP 85-94
  • Authors:
    • Lewis, R H
    • Welborn, J Y
  • Publication Date: 1948-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00210862
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 13 1994 12:00AM