Study On The Aging And Recycling Rules Of SBS Modified Asphalt

TFOT and PAV were used to study the effect of various factors on physical and rheological properties of SBS modified asphalt.Combined with SARA analysis,Infrared Spectrum,Fluorescence Spectrum analysis of SBS modified asphalt,the aging rules were discussed.Kinetic models and non-linear differential equations of aging SBS modified asphalt were established,and the validity of the models were evaluated.On the basis of ordinary regenerant,a new kind of SBS modified asphalt regenerant was researched,and the performance of this new regenerant was evaluated.Results show that providing that there are no interactions between SBS and base asphalt in SBS modified asphalt,with the increase of aging temperature,aging time and the decrease of the asphalt film thickness,asphalt makes more contribution to aging process.When aging process becomes deepening,the relative activation energy of base asphalt increases slightly,and the SBS modified asphalt relative activation energy?E_a1/R reduces,while?E_a2/R increases gradually.By Fluorescence Spectroscopy analysis,two different fluorescence peak appear and fluorescence intensity become weaker with the asphalt aging gradually;Take softeningening point,penetration and viscosity of asphalt as parameters respectively,aging kinetic models and non-linear differential equations are established,and the penetration aging equation which is established for the aging of base asphalt and SBS modified asphalt is feasible;Based on the aging rules of SBS modified asphalt,a new kind of regenerant named MR was studied,and the response surface methodology is used to make sure the formulations.The best composition of MR has been studied:content of oil A is 42wt%,assistant B is 8wt%,and the mixing time is 2 h.Studies have shown that MR has good regeneration effect on the aged SBS modified asphalt samples,especially on the improvement of the low temperature properties of asphalt,and the best dosage is20wt%²5wt%.