PHYSICAL PROPERTIES OF ASPHALTS IN THIN FILMS

THE FORCE PER UNIT AREA REQUIRED TO RUPTURE THIN FILMS OF ASPHALT CONTAINED BETWEEN TWO STEEL PLATES WAS MEASURED AT 77 F. THE ASPHALT WAS FOUND TO BEHAVE LIKE A SOLID IN THAT FLOW DID NOT OCCUR, AND RUPTURE AT FILM THICKNESSES BETWEEN 0.002 AND 0.007 CM WAS SUDDEN. FILM STRENGTH WAS FOUND TO INCREASE LINEARLY WITH FILM THICKNESS TO A MAX AND THEN DECREASE, AND IT WAS OBSERVED THAT THERE WAS A RELATION BETWEEN THE MAX FILM STRENGTH AND THE SURFACE TENSION. FOR MOST ASPHALTS OPTIMUM FILM THICKNESS INCREASED WITH VISC. THE BEARING STRENGTH OF ASPHALT-SAND MIXTURES USED IN MAKING PAVEMENTS WAS ALSO INVESTIGATED, AND IT WAS FOUND THAT CALCULATED FILM THICKNESSES AT OPTIMUM ASPHALT CONTENT WERE OF THE SAME MAGNITUDE AS THE OPTIMUM VALUES OBTAINED USING STEEL PLATES.

  • Supplemental Notes:
    • Vol 49, P 422
  • Authors:
    • Mack, C
  • Publication Date: 1957

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Filing Info

  • Accession Number: 00210916
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: May 21 1994 12:00AM