Abstract
The softening point and % elastic recovery of SBS modified binders (SBS-MB) decrease by up to 12 °C and 30%, respectively, within 7 days of storage at 180 °C due to the thermal degradation of the SBS molecules. The rut depth nearly doubles in asphalt mixes prepared using the SBS-MBs stored at 180 °C for 7 days. Contrary to the observed property deterioration, the rheological parameters measured at the frequency (ω) = 10 rad/s, exhibit only minor changes. Analysis through frequency sweep measurements (100–0.01 rad/s), reveal that the rheological properties essentially overlap at ω ≥ 1 rad/s, and the property erosion is mainly evident at ω ≤ 0.1 rad/s and test temperatures > 50 °C. The observed result implies that the binder molecules and the shorter segments of the SBS molecules dominate the rheological response at ω ≥ 1 rad/s due to which the rheological curves overlap. It is evident from the study that at upper service temperature, a rheological parameter measured at ω ≤ 0.1 rad/s is essential for good quality control, grading, and performance evaluation of polymer modified binders (PMBs). This study provides valuable insights that are beneficial for the pavement construction industry.
Published Version
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