In order to promote the application of polyurethane modified asphalt materials,experimental methods such as segregation,penetration,and softening point were used to evaluate the performance of polyurethane modified asphalt.Preparation process parameters such as shear temperature(140 ℃),shear time(50 min),shear rate(3 500 r/min),and reasonable dosage(13％)were determined.The performance testing techniques such as rutting and small beam bending tests were used to objectively evaluate the high and low temperature road performance of SMA-10 thin layer polyurethane modified asphalt mixture.The results indicate that the polyurethane thin layer overlay asphalt mixture designed using the preparation process parameters determined in the article has excellent road performance and good prospects for promotion and application.
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