Preparation of PU-SBS Composite Modified Asphalt AndIts Performance Research
In order to comprehensively improve the road performance of asphalt,this paper prepares a polyurethane(PU)compounded SBS composite modified asphalt.PU-SBS composite modified asphalt three major index test,softening point difference test and dynamic viscosity test to evaluate its basic properties,using dynamic shear rheology test(DSR)and low temperature bending beam rheology test(BBR)to eval-uate the rheological properties of PU-SBS composite modified asphalt at different temperatures.The results show that SBS and PU have im-proved the needle penetration and softening point,PU has improved the delay significantly and the appropriate amount of SBS also has a certain contribution to the delay,SBS can significantly improve the dynamic viscosity of the composite modified asphalt,PU does not contribute to the dynamic viscosity value of the composite modified asphalt,and the two modifiers and the asphalt have a good compatibility,SBS can signifi-cantly improve the high temperature performance of the asphalt,and the low temperature performance of the asphalt is mainly by PU.The low-temperature performance of asphalt is mainly contributed by the PU,PU compound SBS modified asphalt high and low temperature is better than a single modifier,the basic performance and high and low-temperature rheological properties of the recommended modification and the best yield of 3%SBS + 20%PU.
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