星型/线型SBS复配改性高黏弹沥青物理-黏弹特性及组成设计研究OA

In response to the diverse types of current high viscosity and elasticity modifiers,molecular structure so-lidification of traditional star shaped & linear SBS modifiers,difficult to dissolve and lack of significant performance improvement in the preparation of high viscosity and elasticity modified asphalt,a composite modification strategy of linear and star shaped SBS is proposed,which can effectively improve the dispersion of modifiers in asphalt by the synergistic effect of the two types of SBS,thereby enhancing the comprehensive road performance of modified as-phalt.Based on the influence of different types of SBS modifiers on the properties of asphalt,the effects of different dosages of linear and star shaped composite SBS on the physical properties,viscoelastic properties,and workability of high viscosity modified asphalt is explored.The research results show that the penetration of single modified as-phalt decreases with the increase of two SBS contents,the softening point gradually increases,and the ductility shows a characteristic of first sharply increasing and then slowly increasing;The penetration of high viscosity modi-fied asphalt continues to decrease with the increase of SBS content,while the softening point,ductility,and 60 ℃dynamic viscosity all significantly increase with the increase of SBS content.Moreover,the elastic recovery rate of the modified asphalt after compounded exceeds 90％.Research has shown that precise control of the physical and viscoelastic properties of modified asphalt can be achieved by adjusting the type and dosage of modifiers,as well as the dosage of stabilizers.This composite modification scheme can improve the viscoelastic performance of asphalt,providing key experimental basis for the composition design optimization and engineering application of high vis-coelastic modified asphalt.