Asphalt Binder Aging Methods to Accurately Reflect Mixture Aging (2021) / Chapter Skim
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1 Since aging of asphalt binder significantly influences the performance of asphalt mixtures, the specifications for performance-graded (PG) asphalt binder -- AASHTO M 320, Standard Specification for Performance-Graded Asphalt Binder and AASHTO M 332, Standard Specification for Performance-Graded Asphalt Binder Using Multiple Stress Creep Recovery (MSCR)
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2 Asphalt Binder Aging Methods to Accurately Reflect Mixture Aging index to the recovered loose-mix-conditioned aging index was not a function of the viscosity of the binder at the conditioning temperature. Binder leakage did not occur for any of the binders when conditioned at 163°C per AASHTO T 240, including a ground-tire-rubber (GTR)
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Summary 3 10 years in service. Feasibility experiments found novel approaches of using acoustic, sonic, and ultrasonic mixing to accelerate oxidation reactions were not successful; therefore, further development work investigated changing PAV operating parameters to accelerate aging.
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4 Asphalt Binder Aging Methods to Accurately Reflect Mixture Aging requirement for the pans in the PAV and (2) the need to form the thin film under nitrogen at 135°C before PAV conditioning to ensure modified binders produce a uniform thin film.
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