Evaluation of Rejuvenator on Softening, Toughness, and Diffusion Ability for Lab-Aged SBS Modified Asphalt

摘要

Rejuvenator is widely used for aged SBS modified asphalt recycling. The objective of this research is to develop a procedure to evaluate rejuvenator on the soften ability, toughening ability, and diffusion ability for aged SBS modified asphalt. Four kinds of rejuvenator and two kinds of self-made SBS modified asphalt were selected. First, penetration grade tests and SHRP asphalt tests were taken for lab-aged SBS modified asphalt whose SBS content was 15%. Second, infrared spectrum experiment and toughness test were taken. Third, a new diffusion test was designed to evaluate permeability of four different kinds of rejuvenator. The test data included penetration, soften point, ductility, G*/sinδ, BBR stiffness S, BBR slope m, viscosity, and toughness. The test results showed that with the aging time increase, the C=C bond rupture gradually. Rejuvenator B was best on toughness ability and diffusion ability for lab-aged SBS modified asphalt. The diffusion ability of rejuvenator could be evaluated by the designed diffusion test.