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为探究不同老化条件对SBS改性沥青高、低温流变特性的影响,以SK90#及中海油110#为基质沥青在室内制备了不同SBS掺量的SBS改性沥青,分别通过RTFOT及PAV老化试验模拟SBS改性沥青的短、长期老化,并对未老化及不同老化试验后的SBS改性沥青进行动态剪切流变(DSR)试验和低温弯曲梁流变(BBR)试验,分析不同老化条件下的SBS改性沥青高、低温流变特性。结果表明:RTFOT老化之后SBS改性沥青的高温稳定性得到提高,且SBS改性剂掺量的增大能提高沥青的高温稳定性和抗老化性能;PAV老化降低了SBS改性沥青的低温流变特性,且增加SBS改性剂的掺量在一定程度上降低了SBS改性沥青的低温流变特性,基质沥青类型对SBS改性沥青低温流变性有显著影响。
In order to explore the effect of different aging conditions on the rheological properties of SBS modified asphalt at high and low temperature, SBS modified asphalt with different SBS content was prepared indoors by using SK90 # and CNOOC # 110 as the base asphalt, and then tested by RTFOT and PAV aging test The short-term and long-term aging of SBS modified asphalt were simulated. Dynamic shear rheological (DSR) test and low temperature bending beam rheological (BBR) test were conducted on unaged and aged asphalt mixture. Under the SBS modified asphalt high and low temperature rheological properties. The results show that the high temperature stability of SBS modified asphalt after RTFOT aging is improved, and the increase of the content of SBS modifier can improve the high temperature stability and anti-aging performance of asphalt. PAV aging reduces the low temperature flow of SBS modified asphalt And the increase of the content of SBS modifier reduces the low temperature rheological properties of SBS modified asphalt to a certain extent. The type of matrix asphalt has a significant effect on the low temperature rheological properties of SBS modified asphalt.