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    The Prediction of Coating-Grade Asphalt Weatherability from Asphaltene-Dispersibility Data

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    The dispersibility of the least soluble asphaltenes shows a good linear correlation with Weather-Ometer durability for coating-grade asphalts made by air blowing straight-run, blended crude oil, ferric-chloride-catalyzed residua, and oil fluxed stocks. Asphalts blown from phosphoric-acid-catalyzed residua show poor correlation.

    A modification of the original procedure for titration of the xylene solutions of asphalt with n-heptane is presented. The modified method eliminates back-titrations that prove troublesome with some asphalts. Repeatability and reproducibility for these asphalts is improved over results obtained with the original procedure.

    Author Information:

    Jones, T. K.
    California Research Corp., Richmond, Calif.

    Committee/Subcommittee: D08.21

    DOI: 10.1520/STP44534S