Field Test of a Polyphosphoric Acid (PPA) Modified Asphalt Binder on Rt. 1 in Perry: Second Interim Report
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Field Test of a Polyphosphoric Acid (PPA) Modified Asphalt Binder on Rt. 1 in Perry: Second Interim Report

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  • Abstract:
    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 PG64-28. 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. 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.

    This experimental construction study was established to field test the long term performance of the PPA

    modified PG64-28 and compare it to the PG58-28 neat asphalt binder.

    A highway reconstruction project, NH-1000(800)E, along Rt. 1 in Perry, Maine was selected as a suitable

    site for this comparison.

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