不同掺量SBS改性沥青黏韧行为研究  

Evaluation of the Conventional and Tough-Tenacity Properties of SBS Modified Asphalt Binders

作　　者：王冠 毛菊良 WANG Guan;MAO Juliang(Shanghai Municipal Highway Engineering Testing Co.,Ltd.,Shanghai 201108;Shanghai Tongji Testing Technology Co.,Ltd.,Shanghai 200441)

机构地区：[1]上海市市政公路工程检测有限公司,上海201108 [2]上海同济检测技术有限公司,上海200441

出　　处：《石油沥青》2024年第2期19-24,58,共7页Petroleum Asphalt

摘　　要：SBS具有特殊的软硬链段结构,可在沥青中形成稳定的聚合物三维网络结构,因此,SBS改性沥青具备优异的性能。目前,传统三大指标无法充分评价SBS改性沥青的性能。为此,通过黏度、黏韧性和测力延度等黏弹性试验指标对SBS掺量对沥青性能的影响规律进行研究,并与三大指标试验结果进行对比。结果表明:随着SBS掺量的增加,沥青的三大指标、动力黏度、布氏旋转黏度、车辙因子逐渐增大。6%掺量的SBS对沥青常规性能和高温失效温度的提升最为明显。相比基质沥青,SBS改性沥青的最大拉力值增加且应力松弛时间延长。6%SBS掺量下SBS改性沥青的低温延展性最佳,8%掺量下SBS改性沥青黏韧性能最佳且韧性部分提高最多,增韧效果显著。相关性分析表明,沥青60℃动力黏度对数值、70℃车辙因子对数值与黏韧性指标线性相关性较强。SBS has a special soft and hard chain segment structure,which can form a stable three-di⁃mensional network structure in the asphalt,making SBS modified asphalt with excellent performance.At pres⁃ent,the three traditional indicators cannot fully evaluate the performance of SBS modified asphalt.Therefore,this article studies the impact of SBS's impact on the performance of asphalt performance through viscosity,toughness-tenacity,and force ductility tests,and compares with the results of the three major indicators.The results showed that with the increase of SBS content,the three major indicators,dynamic viscosity,rotational viscosity and rutting parameter increased.The most obvious improvement on the conventional performance and failure temperature of the base asphalt was observed when the SBS content was 6%.Compared with the base asphalt,the tensile length curve of SBS modified asphalt,the maximum tensile value increased,and the stress relaxation time is prolonged.6%SBS modified asphalt has the best ductility performance at low temperature,and 8%SBS modified asphalt has the highest toughness-tenacity performance.Correlation analyses showed that the logarithmic values of dynamic viscosity at 60℃,logarithmic values of rutting factor at 70℃,and vis⁃cosity-toughness indexes were strongly linearly correlated.

关 键 词：SBS改性沥青 SBS掺量 动力黏度 黏韧性 测力延度 

分 类 号：U414[交通运输工程—道路与铁道工程]