【摘要】 将苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)、废旧轮胎胶粉(GTR)和相容剂环氧天然橡胶(ENR)熔融共混,然后再分散到沥青中制备了SBS/GTR复合改性沥青,考察了ENR含量、SBS/GTR(质量比)对复合改性沥青热储存稳定性和基本性能的影响。结果表明,随着ENR含量的增加或SBS含量的减少,SBS/GTR复合改性沥青的热储存稳定性提高,当ENR质量分数为1.0%、SBS/GTR为50/50时,复合改性沥青的热储存稳定性最佳;随着ENR含量的增加,SBS/GTR复合改性沥青的软化点、针入度、延度和黏度变化不大,但当ENR质量分数为10.0%时,改性沥青的软化点明显升高,针入度下降,属于一种比较硬质的改性沥青,具有较好的施工和易性;随着SBS含量的减少,SBS/GTR复合改性沥青的软化点、黏度和延度均降低。更多还原

【Abstract】 Storage-stable styrene-butadiene-styrene triblock copolymer( SBS) / ground tire rubber( GTR) hybrid modified asphalts were prepared by dispersing the melt blend of SBS,GTR and epoxidized natural rubber( ENR) into base asphalt.Effects of ENR content,SBS / GTR( mass ratio) on storage stability,phase structure and properties were studied. The results showed that the storage stability of the modified asphalt was improved with the increase of ENR content or decrease of SBS content,and the modified asphalt achieved the best storage stability when mass fraction of ENR was 1. 0% and SBS / GTR was 50 /50. ENR content had a slight influence on the softening points,penetration,ductility and viscosity of hybrid binders, however, when the mass fraction of ENR reached10. 0%,softening points increased and penetration decreased obviously,and the modified asphalt was hard and easy to operate. The softening points,viscosity and ductility of the modified asphalt all decreased with the decrease of SBS content.更多还原