聚醚型TPU改性沥青性能及改性机理研究  

Research on the Properties and Modification Mechanism of Polyether TPU Modified Asphalt

作　　者：张新为 王刚 刘志伟 苏军 胡苗苗 赵毅 ZHANG Xin-wei;WANG Gang;LIU Zhi-wei;SU Jun;HU Miao-miao;ZHAO Yi(CSCEC Road and Bridge Group Co.Ltd.,Shijiazhuang 050001,China;Hebei Province Highway Engineering Green Construction Technology Innovation Center,Shijiazhuang 050001,China;Chongqing Shapingba Transportation Industry Co.Ltd.,Chongqing 400030,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中建路桥集团有限公司,石家庄市050001 [2]河北省公路工程绿色施工技术创新中心,石家庄市050001 [3]重庆沙坪坝交通实业有限公司,重庆市4400030 [4]重庆交通大学土木工程学院,重庆市400074 [5]重庆交通大学材料科学与工程学院,重庆市400074

出　　处：《公路》2024年第12期63-71,共9页Highway

基　　金：重庆市研究生联合培养基地建设项目,项目编号JDLHPYJD2021011。

摘　　要：为了探究聚醚型热塑性聚氨酯弹性体(TPU)改性沥青的性能及改性机理,采用沥青3大指标试验、离析试验、布氏旋转黏度试验、多应力蠕变恢复试验、温度扫描试验、热重试验和傅里叶变换红外光谱试验,分析TPU改性沥青的基本性能、储存稳定性、黏温特性、流变性能、温度敏感性和热解特性,揭示TPU改性沥青的改性机理。结果表明,TPU改性沥青具有良好的高温抗变形能力、储存稳定性和热稳定性,推荐TPU最佳掺量为5%。相比于SBS改性沥青,TPU改性沥青的施工温度约低10℃,属于低碳环保型路面材料。不同TPU粒径和掺量的TPU改性沥青车辙因子和疲劳因子具有相似的变化规律。TPU的掺入提高了沥青中的弹性成分,增强了高温稳定性。热塑性聚氨酯弹性体中异氰酸酯与基质沥青的芳香族化合物发生化学加成反应,TPU改性沥青的特征峰主要以脂肪族C-H官能团伸缩振动、含氧官能团以及C=C为主,改善了基质沥青的物理力学性能。In order to explore the properties and modification mechanism of polyether thermoplastic polyurethane elastomer(TPU)modified asphalt,the basic properties,storage stability,viscosity temperature characteristics,rheological properties,temperature sensitivity,and pyrolysis characteristics of TPU modified asphalt are analyzed using three major asphalt index tests,segregation test,Brinell rotation viscosity test,multiple stress creep recovery test,temperature scanning test,and thermogravimetric test,and the modification mechanism is analyzed by Fourier transform infrared spectroscopy test.The results indicate that TPU modified asphalt has good high-temperature deformation resistance,storage stability,and thermal stability.The recommended optimal TPU content is 5%.Compared to SBS modified asphalt,TPU modified asphalt has a construction temperature about 10℃lower,making it a low-carbon and environmentally friendly pavement material.The rutting factor and fatigue factor of TPU modified asphalt with different TPU particle sizes and contents have similar variation patterns.The addition of TPU improves the elastic composition of asphalt and enhances its high-temperature stability.Isocyanates in thermoplastic polyurethane elastomers undergo addition reactions with aromatic compounds in the base asphalt.The characteristic peaks of TPU modified asphalt are mainly the stretching vibration of aliphatic C-H functional groups,oxygen-containing functional groups,and C=C,which improve the physical and mechanical properties of the base asphalt.

关 键 词：TPU改性沥青 黏温特性 流变性能 热解特性 改性机理 

分 类 号：U414.1[交通运输工程—道路与铁道工程] TU535[建筑科学—建筑技术科学]