Investigation of blending conditions effect on GTR dissolution and rheological properties of rubberized binders

Abstract

Ground Tire Rubber (GTR) is one of the asphalt modifiers that enhances the performance properties of asphalt mixtures and helping to reduce environment pollutions. Improvement in the mechanical behavior of rubberized binders depends on the mechanism of interactions between GTR and base binder. The primary objective of this study is to evaluate the effect of GTR dissolution on rheological properties and performance properties of the asphalt binder. The effect of interaction between blending conditions and GTR concentrations were evaluated utilizing GTR extraction, Superpave tests, LAS, MSCR, and ANOVA method. The second objective is to determine the relationship between performance grade temperature and temperature susceptibility of rubberized binder considering the GTR dissolution factor. The results indicated that the influence of blending temperature in increasing GTR dissolution is more significant than the effect of other blending parameters. Furthermore, the addition of GTR leads to improving the rutting resistance and fatigue behavior of the asphalt binder. Finally, the result of ANOVA shows that the blending conditions have a significant effect on GTR dissolution in the rubberized binder. © 2019 Elsevier Ltd