液态橡胶改性剂/SBS复合改性沥青的性能与微观机理  

Performance and Microscopic Mechanism of Liquid Rubber Modifier/SBS Modified Asphalt

作　　者：李许峰 李晓娟 成高立 周敦宏 LI Xu-feng;LI Xiao-juan;CHENG Gao-li;ZHOU Dun-hong(Shaanxi Expressway Mechanisation Engineering Co.,Ltd.,Xi’an,Shaanxi 710038,China;Shaanxi Transportation Holding Group Technology Development Co.,Ltd.,Xi’an,Shaanxi 710077,China;Xi’an Highway Research Institute Co.,Ltd.,Xi’an,Shaanxi 710065,China;Xi’an Huaze Highway Material Co.,Ltd.,Xi’an,Shaanxi 710065,China;School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China)

机构地区：[1]陕西高速机械化工程有限公司,陕西西安710038 [2]陕西交控科技发展集团股份有限公司,陕西西安710077 [3]西安公路研究院有限公司,陕西西安710065 [4]西安华泽道路材料有限公司,陕西西安710065 [5]长安大学公路学院,陕西西安710064

出　　处：《公路交通科技》2024年第11期24-32,共9页Journal of Highway and Transportation Research and Development

基　　金：陕西省技术创新引导专项(2022CGBX-28);陕西省重点研发计划项目(2023JBGS-18)。

摘　　要：为研究液态橡胶改性剂/SBS复合改性沥青的作用机理,制备了液态橡胶改性剂改性沥青(LRM/MA)和液态橡胶改性剂/SBS复合改性沥青(LRM/SBSMA)。采用针入度、软化点、延度及高温流变性能等宏观试验测试了改性沥青基本物理性能指标,借助FTIR、扫描电镜、荧光显微镜和差示扫描量热法等微观技术研究分析其改性机理。基本物理性能研究结果表明:与SK-90^(#)基质沥青相比,LRM/MA和LRM/SBSMA的针入度分别降低了16.9%和18.4%,软化点分别提升了21.1%和42.3%,延度性能分别提高了54.7%和153.7%,且高温稳定性显著提高。FTIR结果表明:SK-90^(#)基质沥青、液态橡胶改性剂和SBS改性剂之间通过物理共混和微弱的化学反应形成了稳定的胶凝结构。扫描电镜结果表明:SBS改性剂促进了液态橡胶改性剂在SK-90^(#)基质沥青中的吸附融合,使得LRM/SBSMA改性效果更佳。荧光显微镜结果表明:SK-90^(#)基质沥青呈现单一均质的连续相结构,LRM/MA呈现不均匀的连续结构,LRM/SBSMA呈现微相分离的空间网状结构。差示扫描量热法结果表明:SK-90^(#)基质沥青经液态橡胶改性剂、液态橡胶改性剂/SBS复合改性后,差示扫描量热曲线吸热峰面积减小,温度敏感性降低,高温稳定性得到有效提高。To study the modification mechanism of liquid rubber modifier/SBS modified asphalt,the liquid rubber modifier modified asphalt(LRM/MA)and the liquid rubber modifier/SBS modified asphalt(LRM/SBSMA)were respectively prepared by using the self-made liquid rubber modifier.The basic physical performance indicators of modified asphalt were tested with the macroscopic tests,i.e.penetration,softening point,ductility,and elevated temperature rheological properties.The modification mechanism was analyzed by using micro technologies,i.e.FTIR,scanning electron microscopy,fluorescence microscopy,and differential scanning calorimetry.The study result of basic physical properties indicates that the penetrations of LRM/MA and LRM/SBSMA decrease by 16.9%and 18.4%compared with SK-90^(#)matrix asphalt.Meanwhile,the softening points increase by 21.1%and 42.3%.The ductility performances increase by 54.7%and 153.7%.The elevated temperature stability is significantly improved.The FTIR result indicates that a stable cementitious structure is formed among SK-90^(#)matrix asphalt,rubber modifier modified and SBS modifier through physical blending and weak chemical reaction.The scanning electron microscopy result indicates that the SBS modifier promotes the adsorption and fusion of liquid rubber modifier in SK-90^(#)matrix asphalt,which makes LRM/SBSMA modification effect better.The fluorescence microscopy result indicates that SK-90^(#)matrix asphalt presents a single homogeneous continuous phase structure.LRM/MA presents an inhomogeneous continuous structure,and LRM/SBSMA presents a spatial network structure with microphase separation.The differential scanning calorimetry result indicates that for SK-90^(#)matrix asphalt,after being modified with liquid rubber modifier and LRM/SBS,the endothermic peak area of differential scanning calorimetry curve decreases,the temperature sensitivity decreases,and the elevated temperature stability is effectively improved.

关 键 词：道路工程 性能评价 微观机理 高温性能 复合改性沥青 液态橡胶改性剂 

分 类 号：U414[交通运输工程—道路与铁道工程]