Influencing Law of SBS Contents on Performance of Rubber Powder Modified Asphalt
To explore the influencing law of SBS contents on the performance indexes of rubber powder modified asphalt,this paper evaluated the performance of the composite modified asphalt with rubber powder of 25％and SBS of 0％,0.5％,1.0％,1.5％,and 2.0％by indexes of viscosity,low-temperature ductility,softening point,penetration,and elastic recovery,and investigated the improvement effect of the sulfur-containing accelerator N with a content of 0.1％-0.3％on the high-temperature segregation of SBS and rubber powder composite modified asphalt.The results showed that,within the investigation content range,the improvement effect of rubber powder modified asphalt was directly proportional to the SBS content,and the viscosity of all samples met the technical requirements.The accelerator N could effectively alleviate the high-temperature segregation of composite modified asphalt,and when the content was 0.3％,the softening point difference between the upper section and lower section was reduced to 1.5 ℃ in storage stability tests.Through the analysis,SBS can improve the overall performance of rubber powder modified asphalt,and the higher the content,the better the improvement effect,and a small amount of accelerator N can effectively solve the high-temperature segregate problem caused by the structural differences between SBS,rubber powder,and asphalt,without affecting the performance of modified asphalt.
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