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Responsible Use of Polyphosphoric Acid (PPA) Modification of Asphalt Binders
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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) Since the introduction of Superpave performance-grade (PG) binders, PPA has been used as an additive for adjusting rheological properties to meet PG specification parameters. PPA has also been used to modify asphalt binders that need an extended range between the high and low temperature performance requirements to meet PG specification limits. Since the early 1990s, PPA has also been used in combination with polymer modifiers in polymer modified asphalt binders to enhance the quality of paving grade asphalt binders. This report discusses use of PPA as an asphalt binder modifier and presents information on detection and quantification of PPA in asphalt binders.