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Field test of a polyphosphoric acid (PPA) modified asphalt binder on Rt. 1 in Perry.
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    The Maine Department of Transportation (MaineDOT) uses the Superpave hot mix asphalt process and specifies asphalt binder grades using the Performance Grade criteria. The Department mainly uses asphalt binder grade PG 64-28. This is an asphalt binder material that passes the performance tests for high temperatures (rutting potential) at 64 degrees Celsius and passes tests for low temperatures (thermal cracking) at -28 degrees Celsius. In order to create the properties of PG binder, polyphosphoric acid is sometimes added to the asphalt. It is widely recognized in the industry that the addition of polyphosphoric acid to asphalt can increase the high temperature PG grade to the next higher grade. However, there are concerns among transportation agencies that this PPA could alter the long term performance of the asphalt binder. One of the major asphalt suppliers to MaineDOT paving projects uses PPA to alter their PG58-28 neat asphalt binder into a PG64-28.
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