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    Responsible Use of Polyphosphoric Acid (PPA) Modification of Asphalt Binders 

    Baumgardner, Gaylon; Hajj, Elie Y.; Aschenbrener, Timothy B.; Hand, Adam J. T. (2023-02)
    Polyphosphoric acid (PPA) has been used to chemically modify asphalt binders to improve high temperature rheological properties, without adversely affecting low temperature rheological properties, since the early 1970s.(1) ...