SBS改性沥青低温性能研究

Research on low-temperature performance of SBS modified-asphalt

为了研究BBR试验方法对SBS改性沥青低温性能评价的合理性,采用3种基质沥青、3种SBS改性剂,制备了5种SBS改性沥青,通过BBR试验得到沥青的劲度模量S和劲度模量变化率m,计算得到其低温等级温度TLC,并与各沥青的延度值进行比较,结果表明用TLC评价SBS改性沥青的低温性能更加合理,并分析了基质沥青和SBS类型对TLC的影响规律,结果表明,基质沥青中胶质和芳香酚含量越高改性沥青低温性能越好,线型SBS改性沥青低温性能优于星型SBS改性沥青。

In order to study the reasonability of BBR test method to evaluate low-temperature performance of SBS modified asphalts,five SBS modified asphalts were prepared with three neat asphalts and three SBS modifiers.The creep stiffness S and the rate of change of creep stiffness m were obtained based on the BBR tests and critical low temperatures TLC were computed.According to the comparison between TLC and ductility,TLC is more reasonably used as the TLC evaluation of low-temperature performance of SBS modified asphalt.And the neat asphalts and SBS types＇ influences on TLC were discussed.The results showed that the higher content of resin and aromatic the better the low-temperature performance of SBS modified asphalt is,and the low-temperature performance of linear SBS modified asphalt is better that that of redial SBS modified asphalt.