| As time goes by,various problems will occur on the asphalt pavement and affect the driving comfort and safety of the road.Therefore,it is especially important to prevent the asphalt pavement.The ultra-thin wear layer using SBS modified asphalt is preventive.One of the main ways of sexual conservation.In addition,a large number of used tires are produced every year in the world,and the used tires are processed into rubber powder and used as modifiers in the ultra-thin wear layer to realize resource recycling and sustainable development.The main research contents of the thesis are as follows:(1)The preparation process of rubber powder/SBS composite modified asphalt was studied.From the four factors of modifier addition sequence,modifier pretreatment,shear temperature and shear time,the preparation process was obtained.(2)The effects of rubber powder number and dosage,SBS modifier type and dosage and stabilizer type on the performance of composite modified asphalt were analyzed.Studies have shown that as the number of rubber powder increases,the penetration and Brookfield viscosity of rubber powder/SBS composite modified asphalt decrease continuously,and the softening point and 5 °C ductility increase first and then decrease.At the same time,the best compatibility scheme of rubber powder/SBS composite modified asphalt: the number of rubber powder is 60 mesh,the dosage is 18%,and the content of SBS is 2%~4%.(3)Comparative analysis of the effect of asphalt type on the best oil-stone ratio under the three grades of SMA-10,OGFC-10 and NovaChip? TypeB-10.Studies have shown that under the same grade,the best oil-stone ratio of rubber powder/SBS composite modified asphalt is higher than the best oil-stone ratio of SBS modified asphalt.At the same time,SMA-10 has the best ratio of oil to stone under both asphalt binders.(4)Comparative analysis of high temperature stability,low temperature crack resistance and water stability of SMA-10,OGFC-10 and NovaChip? Type B-10 under rubber powder/SBS composite modified asphalt and SBS modified asphalt.Studies have shown that the SMA-10 grading has the highest dynamic stability when using rubber powder/SBS composite modified asphalt,and the NovaChip? ypeB-10 grading has the highest bending strength and the three grading residual stability.It has beenimproved,which in turn indicates that the composite modified asphalt has strong adhesion to the mineral.(5)Using the fractal dimension test system to obtain the fractal dimension of the ultra-thin wear layer,and use the fractal dimension to analyze its anti-sliding performance.The research shows that when using rubber powder/SBS composite modified asphalt as asphalt cement,the fractal dimension is:OGFC-10>NovaChip?TypeB-10>SMA-10,indicating that SMA-10 is grading in this paper.Downline,the mineral material is thicker,but its fractal dimension is still small,and the anti-sliding performance is still small. |
