【摘要】 选取不同的活化胶粉掺量、SBS掺量和油胶比，采用五因素四水平的正交试验，基于针入度、软化点、延度和弹性恢复等指标，通过均值和极差等综合分析得到了双螺杆活化胶粉/苯乙烯-丁二烯-苯乙烯嵌段共聚物（CR/SBS）复合改性沥青的相对最佳配方。通过温度扫描、多应力蠕变恢复试验、低温弯曲蠕变及荧光显微观测等试验，将其与不同掺量的活化胶粉单一改性沥青（CR30%和CR40%）、SBS改性沥青和70号基质沥青进行对比分析，以评价其性能。研究结果表明：（1）通过正交试验均值和极差分析，得到了CR/SBS复合改性沥青的最优配方：活化胶粉掺量为30%,SBS掺量为2.5%，油胶比为1∶6。（2）最优配方下的CR/SBS复合改性沥青相较其他4种沥青，具有更高的复数剪切模量和车辙因子、更小的相位角、更宽的PG分级温度范围，综合性能相对最佳。（3）采用活化胶粉和SBS对沥青进行复合改性时，活化胶粉颗粒与SBS相结合使橡胶聚合物的连续性层叠网状结构更加紧密，使沥青具有更好的高温抗变形和低温抗开裂能力。更多还原

【Abstract】 By selecting different amounts of activated rubber powder,SBS content,and oil/rubber ratio,the five-factor four-level orthogonal experiment was conducted based on indicators such as penetration,softening point,ductility,and elastic recovery,and the relative optimal formula for twin-screw activated rubber powder/styrenebutadiene-styrene block copolymer(CR/SBS) composite modified asphalt was obtained through comprehensive analysis of mean and range. Through temperature scanning,multi stress creep recovery test,low-temperature bending creep,and fluorescence microscopy observation,it was compared and analyzed with activated rubber powder single modified asphalt(CR30% and CR40%) with different dosages,SBS modified asphalt,and matrix asphalt No.70 to evaluate its performance.The research results showed that,(1) The optimal formula for CR/SBS composite modified asphalt was obtained through mean and range analysis of orthogonal experiment:activated rubber powder content was 30%,SBS content was 2.5%,and oil/rubber ratio was 1∶6.(2) The CR/SBS composite modified asphalt under the optimal formula had higher complex shear modulus and rutting factor,smaller phase angle,and wider PG grading temperature range compared to other four types of asphalt,and its comprehensive performance was relatively the best.(3) When using activated rubber powder and SBS for composite modification of asphalt,the combination of activated rubber powder particles and SBS made the continuous layered network structure of rubber polymer more compact,resulting in better high-temperature deformation resistance and lowtemperature cracking resistance of asphalt.更多还原