This paper presents a detailed laboratory investigation conducted to evaluate the rutting and stripping performance of unmodified hot mix asphalt (HMA), polymer modified stone matrix asphalt (SMA), and asphalt-rubber HMA and SMA mixtures designed using Superpave system for state route and rural interstate pavements subjected to high traffic levels with greater than 10 million equivalent single axle loads (ESALs). Two aggregate gradations: (1) Superpave dense gradation (DG) for HMA mixes and (2) gap gradation (GG) for SMA mixes were adopted. Aggregates in dense-graded HMA mixtures comprised of crushed limestone and natural sand while aggregates in gap-graded SMA mixtures consisted of trap rock, crushed gravel, and manufactured sand. These mixtures (i.e. UDG HMA, PMGG SMA, and ARDG HMA and ARGG SMA) were produced from unmodified binder, polymer modified binder, and asphalt-rubber binder, respectively.
Rutting potential and moisture susceptibility of all compacted mix specimens were examined by means of performance tests - Hamburg Wheel-Track (HWT) using AASHTO T 324 and Indirect Tensile Strength (ITS) using AASHTO T 283 respectively, at the optimum asphalt content for each mixture. HWT test results show: (1) ARDG HMA and ARGG SMA mixtures had slightly improved characteristics against rutting as compared to UDG HMA and PMGG SMA mixtures, respectively; and (2) ARDG HMA mixture was found to be more susceptible to moisture damage than UDG HMA mixture, whereas ARGG SMA mixture exhibited higher resistance to moisture damage than PMGG SMA mixture. On the other hand, ITS test results indicate: (1) ARDG HMA mixture had lower moisture susceptibility as compared to UDG HMA mixture; and (2) ARDG HMA and ARGG SMA mixtures almost exhibited the same moisture susceptibility levels. Overall, all the four mixtures were neither prone to rutting nor sensitive to moisture damage. Therefore, all the four mixtures are expected to have satisfactory rutting resistance in the field. However, the asphalt-rubber mixture is likely expected to perform as well as polymer modified mixture against rutting, if not superior.
|Commitee:||Fries, Ryan, Qi, Yan|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 54/03M(E), Masters Abstracts International|
|Keywords:||Asphalt-rubber mixture, Hamburg wheel-track, Indirect tensile strength, Polymer modified sma mixture, Rutting and stripping, Unmodified hma mixture|
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