Understanding the Molecular Surface Charges of Asphalt or Clay Particles and Application in the Transportation and Oil Sands Industries

    Volume 37, Issue 5 (September 2009)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 18 June 2009

    Page Count: 9


    Ho, Susanna
    Schulich School of Engineering, Univ. of Calgary, 2500 University Dr. NW, Calgary,

    Zanzotto, Ludo
    Schulich School of Engineering, Univ. of Calgary, 2500 University Dr. NW, Calgary,

    (Received 20 January 2009; accepted 30 April 2009)

    Abstract

    Asphalt binder is a mixture of many different types of molecules. At the molecular level, one can visualize the asphalt binder as a colloidal system with asphaltene molecules dispersed in oil with naphthene and polar aromatics. The functional groups of the asphaltene molecules are essential in keeping them dispersed as colloids. These polar functional groups include alcohol, amine, carboxylic, and phenolic groups. The polarity of asphalt molecules are very important in allowing them to adhere to the inorganic aggregates, which also bear charges at the surface. The application of this understanding to the aging of paving asphalt, asphalt modification, the Superpave direct tension test, aggregate specific gravity determination, ash as modifiers in asphalt, low-volume road chemical stabilization, and the oil sands industry are discussed.


    Paper ID: JTE003109

    DOI: 10.1520/JTE003109

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    Author
    Title Understanding the Molecular Surface Charges of Asphalt or Clay Particles and Application in the Transportation and Oil Sands Industries
    Symposium , 0000-00-00
    Committee