Rheological Characterization of Ground Tire Rubber Modified Asphalt Binders with Parallel Plate and Concentric Cylinder Geometries

Recently, scrap tire rubber-modified asphalt binders and pavements have been the preferred choice of state DOTs parties involved due to desirable engineering, as well economic environmental impacts. Rheological mechanical properties rubber modifications main focus researchers for last couple decades. This paper investigates rutting potential, fatigue cracking resistance, continuous performance grade (CPG) changes waste rubber-modified, original, aged binders. The CPG is determined at high, intermediate, low temperatures. A Delta T Critical comparison binder was carried out establish a relationship between measured parameters. Linear amplitude sweep (LAS) tests equi-stiffness temperatures were conducted discover life all while multiple stress creep recovery test performed assess high-temperature per Superpave grading system accepted regional (58 °C) high PG In addition, parallel-plate geometry concentric cylinder used with Multiple Stress Creep Recovery (MSCR) impact discrete particles available in crumb/ground standards. results show that improved base binder’s resistance PGs without adversely affecting resistance. Based on mathematical expressions developed, 2.71%, 7.82%, 12.94%, 18.05% (by weight binder), GTR modified one, two, three, four bumps, respectively. Similar linear correlations R2 0.872 0.6 established intermediate PGs, MSCR revealed both 9% 20% achieved enhance H-grade traffic level original E-grade.