植物基生物再生沥青的路用性能及再生机理研究
Study on road performance and mechanism of vegetable-based bio-recycled asphalt
余乐 1何兆益 1李晓民 2魏定邦 2赵静卓 2由诗园3
作者信息
- 1. 重庆交通大学 土木工程学院,重庆 400074
- 2. 甘肃省公路交通建设集团有限公司,甘肃 兰州 730030;甘肃省交通规划勘察设计院股份有限公司,甘肃 兰州 730030
- 3. 重庆市城市建设投资(集团)有限公司,重庆 400023
- 折叠
摘要
采用热重分析仪、差示扫描量热仪和红外光谱仪分析了植物基生物再生剂(WL-2H)的热稳定性和再生机理,基于动态剪切流变实验、测力延度实验和弯曲梁流变实验,探究了原样沥青、老化沥青和再生沥青的流变性能与疲劳特性.结果表明,随着WL-2H掺量的增加,植物基生物再生沥青的车辙因子、蠕变恢复率、低温劲度模量和疲劳因子逐渐减小,不可恢复柔量、延度和劲度模量变化率逐渐增大,Nf50先增大后减小;当WL-2H掺量为7%左右时,植物基生物再生沥青的的路用性能可基本恢复至原样沥青水平;WL-2H具有良好的热稳定性,主要通过物理作用对老化沥青性能进行再生.
Abstract
Thermal stability and regeneration mechanism of vegetable-based bio-rejuvenator(WL-2H)were analyzed by thermogravimetric analysis(TG),differential scanning calorimetry(DSC)and infrared spectrometer(FTIR).Based on dynamic shear rheology(DSR)test,force ductility test(FDT)and ben-ding beam rheology(BBR)test,rheological properties and fatigue characteristics of original asphalt,aged asphalt and regenerated asphalt were investigated.The results show that with the increase of WL-2H con-tent,rutting factor,creep recovery rate,low temperature stiffness modulus and fatigue factor of vegetable-based bio-recycled asphalt decrease gradually,unrecoverable flexibility,ductility and stiffness modulus change rate increase gradually,and Nf50 increases first and then decreases.When the content of WL-2H is about 7%,road performance of vegetable-based bio-recycled asphalt can be basically restored to original asphalt level;WL-2H has good thermal stability and regenerates the performance of aged asphalt through physical action.
关键词
植物油/再生沥青/流变性能/疲劳性能/再生机理Key words
vegetable oil/recycled asphalt/rheological properties/fatigue performance/regeneration mecha-nism引用本文复制引用
基金项目
国家自然科学基金(51978116)
甘肃省科技重大专项(22ZD6GA010)
重庆交通大学研究生科研创新项目(2022B003)
出版年
2024
NETL
NSTL
万方数据