Aggregate surfaces were shown to interact strongly with many I.G.L.C. test compounds having chemical functional groups similar to those believed present in asphalt. I.G.L.C. and infra-red spectroscopy showed that fractions in the asphalt containing the more polar functional groups exhibited the stronger interaction with the aggregate surface. Asphaltenes separated by pentane show a reduced interaction of polar groups with the aggregate, probably because of agglomeration of the asphaltene molecules. Oxidation of the asphalt fractions produced polar functional groups which interacted strongly with aggregate surfaces. Aggregate surfaces were found to catalyse the oxidation of the more non-polar fractions. Their catalytic effect on the more polar fractions is unknown. Of the two aggregates tested, limestone was found to interact more strongly then quartzite with the asphalt fractions, although quartzite was a more effective oxidation catalyst for the more non-polar fractions. Carboxylic acids were found to be a major component formed on oxidation that is strongly adsorbed on the limestone surface. /Author/TRRL/

  • Corporate Authors:

    Society of Chemical Technology

    14 Belgrave Square
    London SW1,   England 
  • Authors:
    • Barbour, F A
    • Barbour, R V
    • Petersen, Jc
  • Publication Date: 1974-11

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00096170
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 24 1975 12:00AM