THE PROPERTIES OF THE RESIDUES OF 50-60 AND 85-100 PENETRATION ASPHALTS FROM OVEN TESTS AND EXPOSURE

IN RECENT YEARS THE VALUE OF THE STANDARD OVEN TEST FOR THE PREDICTION OF THE PROBABLE HARDENING OF ASPHALTS IN THE MIXING AND LAYING OPERATIONS AND UNDER SERVICE CONDITIONS HAS BEEN SERIOUSLY QUESTIONED. MANY INVESTIGATORS HAVE RESORTED TO OXIDATION TESTS TO STUDY THE HARDENING AND WEATHERING PROPERTIES OF ASPHALTS. SPECIFICATIONS ARE NOW IN USE THAT LIMIT THE LOSS IN PENETRATION AND DUCTILITY THAT AN ASPHALT CAN UNDERGO EITHER IN A LABORATORY MIXING TEST OR IN A PLANT-PREPARED HOT-MIX SURFACING SAMPLE IMMEDIATELY AFTER LAYING. THIS REPORT PRESENTS THE RESULTS OF TESTS ON 50-60 AND 85-100 PENETRATION ASPHALTS MADE ON THE RESIDUES FROM THE STANDARD OVEN TESTS AS WELL AS ON THE RESIDUES FROM 50- GRAM SAMPLES EXPOSED TO THE SAME CONDITIONS IN FILMS APPROXIMATELY 1/8-INCH THICK. CHANGES IN THE PROPERTIES OF 85-100 PENETRATION ASPHALTS AFTER EXPOSURE IN 1/8 INCH FILMS FOR 15 WEEKS DURING THE HOT SUMMER MONTHS ARE ALSO SHOWN. ALTHOUGH THE RESIDUES FROM THE STANDARD OVEN TEST ARE NOT GREATLY ALTERED, THE RESIDUES FROM THE 1/8-INCH THIN FILM OVEN TESTS, ESPECIALLY IN THE CASE OF SOME 50-60 ASPHALTS, ARE HIGHLY ALTERED. RESULTS OF TESTS ON THE RESIDUES OF 50- 60 ASPHALTS FROM THE THIN-FILM OVEN TESTS, WHEN COMPARED WITH THE RESULTS OF TEST ON BITUMENS EXTRACTED FROM BOTH LABORATORY-PREPARED MIXTURES AND FROM MIXTURES FROM COMMERCIAL PAVING PLANTS, INDICATE THAT THE 1/8 INCH FILM OVEN TEST PRODUCES ALTERATIONS IN THE ASPHALTS SIMILAR TO THE CHANGES IN PROPERTIES THAT OCCUR DURING THE MIXING PROCESS. IT IS BELIEVED, THEREFORE, THAT A THIN-FILM OVEN TEST MAY PROVE OF VALUE IN PREDICTING THE PROBABLE BEHAVIOR OF ASPHALTS UNDER PROCESSING AND SERVICE CONDITIONS.

  • Availability:
  • Supplemental Notes:
    • Vol 11 & 12, NO 86 & 14
  • Authors:
    • Lewis, R H
    • Welborn, J Y
  • Publication Date: 1941-4

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  • Accession Number: 00210941
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: Jun 3 1994 12:00AM