基于红外光谱的短期老化SBS改性沥青再生微观机理  

Microscopic Mechanism of Short-term Aging SBS Modified Asphalt Regeneration Based on Fourier Transform Infrared Spectroscopy

作　　者：张兴军 冯辉霞[1] 王永宁 李波[3] 张智豪[3] ZHANG Xingjun;FENG Huixia;WANG Yongning;LI Bo;ZHANG Zhihao(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730070,China;Gansu Henglu Traffic Survey and Design Institute Co.,Ltd,Lanzhou 730070,China;Lanzhou Jiaotong University National and Local Joint Engineering Laboratory for Disaster Prevention Technology,Daoqiao University,Lanzhou 730070,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730070 [2]甘肃恒路交通勘察设计院有限公司,甘肃兰州730070 [3]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070

出　　处：《材料科学与工程学报》2020年第2期232-237,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金地区基金资助项目(201664009);国家自然科学基金地区基金资助项目(51562023);国家自然科学基金地区基金资助项目(51063003);甘肃省科技计划资助项目(18YF1GA034)。

摘　　要：为探究不同再生剂类型和掺量对短期老化SBS改性沥青再生微观组成的影响,通过旋转薄膜烘箱(RTFOT)对SBS改性沥青进行短期老化,对其添加普通(西卡再生剂)、改性(信拓-3再生剂)两种不同类型以及不同掺量(4%、8%、12%)的再生剂制得再生沥青,同时对不同再生剂进行扩散试验。对原样、短期老化及再生沥青进行了宏观指标(针入度、延度、软化点)和红外光谱(FTIR)分析。结果表明:SBS改性沥青在短期老化过程中软化点升高,亚砜基特征峰和官能团指数增大,丁二烯(CH2=CH2)基特征峰、丁二烯基指数、针入度、延度减小,添加再生剂亚砜基特征峰、官能团指数、软化点减小,针入度、延度增大;普通再生剂在再生SBS改性沥青制备过程中基质沥青的老化及SBS改性剂的降解程度大于改性再生剂;再生剂掺量为8%时,对短期老化SBS改性沥青改善效果明显;再生剂在短期老化SBS改性沥青扩散过程中,改性沥青性能有一定的改善,但未恢复到原来水平,直接搅拌制备的再生SBS改性沥青性能明显优于再生剂在短期老化SBS改性沥青扩散形成的再生SBS改性沥青。In order to explore the effects of different regeneration agent types and dosages on microstructure of regenerated short-term aging SBS modified asphalt,SBS modified asphalt was aged using rotating thin-film oven(RTFOT).Regenerated asphalt was prepared by adding ordinary regeneration agent(Xika regeneration agent)and modified(Xintuo-3 regeneration agent)two different types regeneration agent,the dosages of which were 4%,8%and 12%.At the same time,adding a set amount of regeneration agent into short-term aging SBS modified asphalt for diffusion test.Original SBS modified asphalt,short-term aged SBS modified asphalt and regenerated SBS modified asphalt were tested by Macro indicators(penetration,ductility,softening point)and FTIR analysis.The results showed that,during the short-term aging of the SBS modified asphalt,the characteristic peaks of sulfoxide group,the functional group index and softening point all increased,but the butadiene-based characteristic peak,the butadiene-based index,penetration and ductility decreased.After adding regeneration agent,the characteristic peaks of sulfoxide group,functional group index and softening point decreased,while the penetration and ductility increased.The aging of matrix asphalt and the degradation degree of SBS modifier with ordinary regeneration agent were larger than modified regeneration agent.When the amount of regeneration agent was 8%,the improvement of short-term aging SBS modified asphalt is obvious.In the diffusion process of regeneration agent during the short-term aging SBS of modified asphalt,the modified asphalt performance has been improved,but it did not return to its original level.The regenerated SBS modified bitumen after direct stirring is obviously better in its performance than regenerated SBS modified bitumen formed by the proliferation of short-term aged SBS modified bitumen.

关 键 词：道路工程 SBS改性沥青 红外光谱 短期老化 再生 

分 类 号：U414.1[交通运输工程—道路与铁道工程]