Pavement Performance of SBS and Rubber Powder Composite Modified Asphalt 

Zhenqing YU 

School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing, CHINA 

Abstract: Given the research status and shortcomings of modified asphalt in China, we took China National Offshore Oil Corporation 70# asphalt as the matrix asphalt, SBS and rubber powder as modifiers, and used the dosage of 4%, 5% and 6% of SBS as well as 2%, 4%, 6% of rubber powder to prepare composite modified asphalt for contrast test. We also studied the preparation technology for SBS and rubber power composite modified asphalt, analyzed the trend of ductility, penetration, softening point and elastic recovery with different proportions of composite modified asphalt, and then analyzed the reasons causing the trend. The results show that at the certain dosage of SBS, as the amount of rubber powder increased, the ductility showed a decreasing trend while the softening point and elastic recovery showed a rising trend, and the penetration decreased first and then rose. Our study can provide important reference for the preparation technology and performance study of composite modified asphalt. 

Keywords: Road engineering; Composite modified asphalt; SBS; Rubber powder; Pavement performance