Physicochemical and Rheological Properties of Microwave Recyled Asphalt Binders

by Laurand H. Lewandowski, US Army Engineer Waterways, Experiment Station, Vicksburg, United States,
Rogers Graham, US Army Engineer Waterways, Experiment Station, Vicksburg, United States,
Jim Shoenberger, US Army Engineer Waterways, Experiment Station, Vicksburg, United States,



Document Type: Proceeding Paper

Part of: Materials: Performance and Prevention of Deficiencies and Failures

Abstract: The purpose of this study was to analyze microwave recycled asphalt binders using Gel Permeation Chromatography (GPC), Fourier-Transform Infrared Spectroscopy (FTIR), and Dynamic Mechanical Analysis (DMA). Standard asphalt binder testing was also performed to evaluate the samples and compare the results to the analytical techniques. A large change in the molecular size distribution was observed when the recycling agent was incorporated into the binder. The complex shear modulus G* at high temperatures or low frequencies was found to increase during microwaving, contrary to previous results by other researchers. The increase in G* correlated with the measured decrease in penetrations and increase in viscosities. The FTIR spectra were found to be very similar for all samples tested.

Subject Headings: Binders (material) | Recycling | Dynamic analysis | Microwaves | Rheology | Asphalt pavements | Physical properties

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