Performance Evaluation of Vulcanized Rubber Asphalt and Desulfurized RubberAsphalt
The micro-morphology of vulcanized rubber powder and desulfurized rubber powder was ob-served by scanning electron microscope(SEM).Modified asphalt was prepared with vulcanized rubber powder and desulfurized rubber powder as modifiers.Taking matrix asphalt as control group,the high-temperature performance and low-temperature crack resistance of three asphalts were evaluated.The modification mechanism was analyzed by infrared spectrum.The results show that the surface of vulcanized rubber powder particles is smooth,with obvious edges and corners,and the particles are relatively dispersed.The surface of desulfurized rubber powder particles is rough and the particles are agglomerated.The viscosity of vulcanized rubber powder modified asphalt is the largest,followed by desulfurized rubber powder modified asphalt,and the viscosity of matrix asphalt is the smallest.Des-ulfurization of rubber powder can reduce the temperature sensitivity of asphalt.The high-temperature rutting resistance and low-temperature cracking resistance of vulcanized rubber powder are better than those of desulfurized rubber powder modified asphalt.Vulcanized rubber powder modified asphalt and desulfurized rubber powder modified asphalt are mainly physically miscible.
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