DURABILITY OF PAVING ASPHALT - PART II, A STUDY OF THE ROSTLER AND HEITHAUS TEST METHODS FOR PAVING GRADE ASPHALTS

THE ROSTLER ANALYSIS WAS PERFORMED ON RECOVERED ASPHALTS FROM THE ZACA-WIGMORE TEST ROAD AND ON A SERIES OF 85-100 PENETRATION GRADE ASPHALTS THAT WERE WEATHERED IN A LABORATORY INFRARED OVEN. ASPHALTENE, NITROGEN BASE, FIRST AND SECOND ACIDIFFINS AND PARAFFIN FRACTIONS WERE OBTAINED BEFORE AND AFTER AGING. THE HEITHAUS TEST WHICH PROVIDES A METHOD FOR MEASURING THE PEPTIZING POWER OF THE MALTENES AND THE PEPTIZABILITY OF THE ASPHALTENES IN ASPHALT TOGETHER WITH A MATHEMATICAL TREATMENT OF THESE FACTORS TO OBTAIN A STATE OF PEPTIZATION OF THE SYSTEM WAS APPLIED TO A SERIES OF 85-100 PENETRATION GRADE PAVING ASPHALTS. SOME OF THE FINDINGS OF THE STUDY ARE' /1/ THE ROSTLER COMPOSITIONAL PARAMETER, A RATIO OF NITROGEN BASES PLUS FIRST ACIDIFFINS TO PARAFFINS PLUS SECOND ACIDIFFINS ON THE ORIGINAL ASPHALT, APPEARS TO RELATE TO ABRASION LOSS AFTER WEATHERING OF THE ASPHALT IN AN INFRARED OVEN. THERE IS NO DEFINITE RELATION WHEN THIS PARAMETER IS COMPARED WITH THE SHEAR SUSCEPTIBILITY OF WEATHERED ASPHALTS AND ONLY A TREND OF A RELATION IS NOTED WHEN THE PARAMETER IS COMPARED WITH THE VISCOSITY OF THE RESIDUE AFTER A SPECIAL DURABILITY TEST, /2/ A FAIR TREND WAS FOUND WHEN SHEAR SUSCEPTIBILITY OF WEATHERED ASPHALTS WAS COMPARED TO A RATIO OF THE ASPHALTENE TO THE NITROGEN BASE CONTENT, /3/ A FAIRLY GOOD RELATION WAS FOUND BETWEEN THE PEPTIZABILITY OF THE ASPHALTENES AND THE VISCOSITY OF A SPECIAL DURABILITY TEST RESIDUE, /4/ NEITHER PEPTIZABILITY OF THE ASPHALTENES OR PEPTIZING POWER OF THE MALTENES CORRELATED WITH THE SHEAR SUSCEPTIBILITY OF THE RESIDUE BUT THE STATE OF PEPTIZATION OF THE SYSTEM PROVIDE A FAIRLY GOOD RELATION, AND /5/ THE RATIO OF NITROGEN BASIS TO PARAFFINS PROVIDED A DEFINITE TREND WHEN COMPARED TO THE PEPTIZING POWER OF THE MALTENES. /BPR/

  • Supplemental Notes:
    • Hpr-1/4/, STATE NO D-3-4
  • Corporate Authors:

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914
  • Authors:
    • Skog, J
  • Publication Date: 1966-7-1

Subject/Index Terms

Filing Info

  • Accession Number: 00210357
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Dec 29 1994 12:00AM