纳米碳化硅改性沥青的抗老化性能及机理研究  

Study on the aging resistance and mechanism of nano-SiC modified asphalt

作　　者：么子成 林祥波 刘昌嵬 刘康 李光耀 YAO Zicheng;LIN Xiangbo;LIU Changwei;LIU Kang;LI Guangyao(Qingdao Transportation Planning and Design Institute Co.,Ltd.,Qingdao 266100,China;School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]青岛市交通规划设计院有限公司,山东青岛266100 [2]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2022年第3期50-58,共9页Journal of Changsha University of Science and Technology:Natural Science

基　　金：山东省交通运输厅科技项目(2016B41)。

摘　　要：【目的】研究纳米碳化硅(SiC)改性沥青的抗老化性能及其微观机理。【方法】采用旋转薄膜烘箱老化试验(RTFOT)和压力老化试验(PAV)对A-70^(#)基质沥青和掺入质量分数分别为3%、6%、9%纳米碳化硅的改性沥青进行短期及长期热氧老化,对老化前后的沥青进行传统物理性能试验、动态剪切流变试验(DSR)、弯曲梁流变试验(BBR)及傅里叶红外光谱试验(FTIR)。【结果】物理性能老化指数与流变老化指数结果一致,表明纳米碳化硅改性沥青的最佳掺量为6%。【结论】纳米碳化硅的掺入可以提高沥青的高温稳定性以及抗老化性能,却对低温抗裂性能不利。纳米碳化硅能够有效抑制老化过程中羰基、亚砜基官能团的生成,阻止沥青进一步老化硬化。[Purposes]This work aims to study the effect of nano-SiC on aging resistance and micro mechanism of asphalt.[Methods]The rolling thin film over test(RTFOT)and pressure aging vessel(PAV)test were used to conduct short-term and long-term thermal oxygen aging on A-70^(#)matrix asphalt and nano-silicon carbide(SiC)modified asphalt with the mass fractions of 3%、6%and 9%.The traditional physical properties test,dynamic shear rheological test(DSR),bending beam rheometer(BBR)and fourier transform infrared spectrum(FTIR)were carried out on asphalt before and after aging.[Findings]The physical property aging index and rheological aging index results consistently show that the 6%of SiC is the optimum dosage.[Conclusions]The addition of nano-SiC could improve the high-temperature stability and aging resistance of asphalt,but it is detrimental to thelow-temperature crack resistance.SiC could effectively inhibit the formation of carbonyl and sulfoxide functional groups in the aging process,preventing the further aging and hardening of asphalt.

关 键 词：纳米碳化硅 改性沥青 抗老化性能 微观机理 老化指数 

分 类 号：U414[交通运输工程—道路与铁道工程]