Effect of Aging on Rheological Properties of Warm Mix Asphalt Binder Containing Recycled Crumb Rubber and Nano-TiO₂/Organic Nano-Montmorillonite

In order to study the influence of aging on the rheological properties of recycled rubber particles, nano-TiO₂ and organic nano-montmorillonite warm mixed asphalt binder, 40 mesh and 60 mesh desulfurized rubber powder with 14%, 18%, 22%, and 26% desulfurized content, Sasobit, organic nano-montmorillonite, and nano-TiO were used; seven kinds of modified asphalt were prepared and tested G*/sinδ of seven asphalts were tested by dynamic shear rheological (DSR) test, bending beam rheological (BBR) test, and multi-stress creep recovery (MSCR) test δ, G*, S, m, etc. The test results show that at 64°C, the modified asphalt G*/sin δ and G* values were significantly higher than those of other asphalt, and nanomaterials have a significant effect on improving the high-temperature rutting resistance of asphalt. In the BBR test, the s value increased, and the m value decreased, indicating that the nanomaterials can improve the deformation resistance of asphalt and improve its low-temperature crack resistance. Through comprehensive comparison, 60 mesh 22%−2.5% Sasobit asphalt has the best performance.