THE EFFECT OF EXPOSURE ON BITUMENS

EIGHT BITUMINOUS MATERIALS, CONSISTING OF ASPHALT CEMENTS, LIQUID ASPHALTS AND TARS WERE EXPOSED IN LAYERS APPROXIMATELY ONE EIGHTH INCH IN THICKNESS IN SHALLOW CONTAINERS PLACED IN GLASS-COVERED BOXES TO THE ACTION OF LIGHT, AIR AND SOLAR HEAT. THE EXPOSURES BEGAN IN DECEMBER AND CONTINUED FOR ONE YEAR. THE EXPOSED SAMPLES WERE REMOVED AT VARIOUS INTERVALS AND THE CHANGES IN WEIGHT AND CONSISTENCY DETERMINED. THE PERCENTAGE GAIN IN INSOLUBLE ORGANIC MATTER WAS ALSO DETERMINED. THE SOLUBILITY OF THE ASPHALTIC MATERIALS WAS DETERMINED BY 86 DEGREE B-NAPHTHA AND THE TAR PRODUCTS BY CARBON DISULFIDE. TEST DATA SHOWED THAT THE HARDENING OF ALL BITUMENS UPON EXPOSURE IS NOT DUE TO LOSS BY VOLATILIZATION OF THE LIGHT CONSTITUENTS ALONE, AND THE INCREASE OF INSOLUBLE MATTER IN THE TWO SOLVENTS INDICATE THAT OXIDATION CONTRIBUTES TO THE DEVELOPMENT OF INSOLUBLE MATTER IN THE ASPHALTIC AND TAR PRODUCTS.

  • Supplemental Notes:
    • Vol 5, P 15
  • Authors:
    • Hubbard, P
    • Reeve, C S
  • Publication Date: 1913

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Filing Info

  • Accession Number: 00210933
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: Jun 3 1994 12:00AM