LIFETIME OF BITUMEN MEASURED BY OXYGEN ABSORPTION

LA LONGEVITE DES BITUMES MESUREE PAR ABSORPTION D'OXYGENE

The absorption of oxygen by bitumen was measured in dark and light conditions. To avoid problems of diffusion, the experiment was carried out in an inert solvent constantly kept stirred. The rate of absorption was considerably increased by fluorescent light and by the traces of some metals. All fractions of a certain chemical type, separated from the bitumen by chromatography, became oxidised in the light, but only the asphaltenes and resins absorbed some oxygen in darkness, this latter reaction being probably triggered off by the free stable radicals present in the bitumen. The proportions of active compounds in very dark bitumen is higher than in lighter bitumen, but in practice the dark colour acts as protection against excessive oxidation in the light. Among known oxidation inhibitors, very few affect the oxidation of bitumen. Those which proved effective accelerated the fixation of oxygen in the light but had practically no effect in darkness. The effects observed with these compounds during tests carried out in the light were verified with the weatherometer. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Knotnerus, J
  • Publication Date: 1973-11-12

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00128699
  • Record Type: Publication
  • Source Agency: Central and Regional Labs of Bridges & Highways,Fr
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM