OXIDATION OF ASPHALT FILMS MEASURED BY LIGHT SCATTERING

THE EXTENT OF OXIDATION OF AN ASPHALT DURING SERVICE IS AN IMPORTANT FACTOR IN CHANGING ITS RHEOLOGICAL AND MECHANICAL PROPERTIES. ONE OF THE BETTER EVALUATION METHODS HAS BEEN TO OXIDIZE ASPHALT FILMS IN A DARK OVEN AND DETERMINE THE INCREASE IN VISCOSITY (MEGAPOISES) AT 25 DEGREES C. IN THE MATERIAL. A SLIDING-PLATE, THIN-FILM VISCOMETER IS USED. A PROCEDURE FOR FORMING THIN FILMS OF ASPHALT BY A MOVING SLIDE IMPACTOR AND OXIDIZING THEM BY EXPOSURE TO OZONE FOR A FEW MINUTES IS DESCRIBED. THE LIGHT-SCATTERING BY THE OXIDIZED FILM IS MEASURED BY A DARK-FIELD MICROSCOPE PROVIDED WITH SPECIAL OPTICS AND A PHOTOCELL ATTACHMENT. THE LIGHT-SCATTERING TECHNIQUE IS A RELIABLE MEASURE OF THE SUSCEPTIBILITY OF AN ASPHALT TO OXIDATION. THERE IS A WELL DEFINED RELATIONSHIP BETWEEN THE DATA FROM THE OVEN TEST AND THOSE OBTAINED BY THE LIGHT-SCATTERING METHOD. /AUTHOR/

  • Supplemental Notes:
    • Vol 8, No 4, PP 453-459
  • Authors:
    • Behl, B A
    • Scrivner, F H
    • Traxler, R N
  • Publication Date: 1969-12

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Filing Info

  • Accession Number: 00211470
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 13 1970 12:00AM