碳纳米管改性沥青及混合料的高温流变和断裂韧性试验  

Experiment on high temperature rheology and fracture toughness of carbon nanotubes modified asphalt and mixture

作　　者：曹睿明[1] 陈小兵[1] 陈先华[1] CAO Ruiming;CHEN Xiaobing;CHEN Xianhua(School of Transportation, Southeast University, Nanjing, Jiangsu 210096, China)

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《江苏大学学报（自然科学版）》2020年第4期473-477,483,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金面上项目(51778136)。

摘　　要：利用室内试验,以基质沥青和SBS改性沥青作对比,研究了碳纳米管对沥青高温流变性能和混合料断裂韧性的影响,并通过差示扫描量热分析和扫描电镜分析对其机理进行解释.结果表明:碳纳米管能显著改善沥青的抗剪切性能和高温抗车辙性能,并提高了沥青混合料的施工温度;当碳纳米管掺量大于2.0%时,车辙因子再无明显增长,相反搅拌温度超过177℃时,沥青极易老化,因此碳纳米管最大掺量为2.0%;碳纳米管的加入降低了沥青150℃时的吸热峰,使沥青热稳定性得到显著改善;与基质沥青和SBS改性沥青相比,碳纳米管的加入对沥青起到物理吸附和加筋作用,极大改善了沥青混合料的断裂韧性.The indoor tests were used to investigate the effects of carbon nanotubes on the rheological properties of high temperature bitumen and the fracture toughness of mixture by comparing base asphalt with SBS modified asphalt,and the mechanism was explained by differential scanning calorimetry and scanning electron microscopy.The results show that carbon nanotubes can significantly improve the anti-shear and high-temperature anti-rut properties of asphalt and improve the construction temperature of asphalt mixture.When the content of carbon nanotubes is more than 2.0%,the rutting factor does not increase obviously.When the temperature reaches above 177℃,bitumen is very easy to aging.Hence the maximum content of carbon nanotubes is 2.0%.The addition of carbon nanotubes decreases the endothermic peak at 150℃,which can improve the thermal stability of asphalt greatly.Compared with the matrix asphalt and SBS modified asphalt,the addition of carbon nanotubes can physically adsorb and reinforce the asphalt and greatly improve the fracture toughness of asphalt mixture.

关 键 词：改性沥青 碳纳米管 高温流变性能 断裂韧性 热稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]