Study on road performance and mechanism of vegetable-based bio-recycled asphalt
Thermal stability and regeneration mechanism of vegetable-based bio-rejuvenator(WL-2H)were analyzed by thermogravimetric analysis(TG),differential scanning calorimetry(DSC)and infrared spectrometer(FTIR).Based on dynamic shear rheology(DSR)test,force ductility test(FDT)and ben-ding beam rheology(BBR)test,rheological properties and fatigue characteristics of original asphalt,aged asphalt and regenerated asphalt were investigated.The results show that with the increase of WL-2H con-tent,rutting factor,creep recovery rate,low temperature stiffness modulus and fatigue factor of vegetable-based bio-recycled asphalt decrease gradually,unrecoverable flexibility,ductility and stiffness modulus change rate increase gradually,and Nf50 increases first and then decreases.When the content of WL-2H is about 7%,road performance of vegetable-based bio-recycled asphalt can be basically restored to original asphalt level;WL-2H has good thermal stability and regenerates the performance of aged asphalt through physical action.
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