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    The Influence of Intermolecular Interactions on Viscosities at Low Temperatures: Forced-Sphere and Forced-Cylinder Viscometers

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    The viscosity of asphalt was found to be dependent upon its thermal history. Asphalt thermally dissociated at 250°C had a lower viscosity than asphalt that had been allowed to associate at 130°C. Viscosities were obtained by forcing a sphere or cylinder (wire) through the asphalt. Temperature range investigated was from 25 to −12°C. Asphalt was examined both as a Newtonian and as a viscoelastic material.


    bitumens, asphalts, viscosity, particle interaction, viscometers

    Author Information:

    Ensley, EK
    Research chemist, Laramie Energy Research Center, Energy Research and Development Administration, Laramie, Wyo.

    Committee/Subcommittee: D04.27

    DOI: 10.1520/STP27092S