Abstract：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.
曹睿明， 陈小兵， 陈先华. 碳纳米管改性沥青及混合料的高温流变和断裂韧性试验[J]. 江苏大学学报（自然科学版）, 2020, 41(4): 473-477.
CAO Ruiming, CHEN Xiaobing, CHEN Xianhua. Experiment on high temperature rheology and fracture toughness of carbon nanotubes modified asphalt and mixture[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2020, 41(4): 473-477.
SUN L, ZHU H R, XIN X T, et al. Preparation of nano-modified asphalt and its road performance evaluation \[J\]. Chinese Journal of Highways and Transport, 2013, 26(1): 15-22．(in Chinese)
FAN J, LI G Y, WANG Z K. Effect of surface treatment of carbon nanotubes on the properties of cement mortar \[J\]. New Building Materials, 2019(8): 43-47．(in Chinese)
WANG M, LIU H J, GONG M H, et al. Study on pro-perties of carbon nanotube fiber modified hot mix asphalt \[J\]. Chinese and Foreign Highways, 2016, 36(1): 213-216．(in Chinese)
ZHU S Y, CHEN S F, QIN X T, et al. Dynamic mechanical properties of high viscosity modified asphalt of pervious asphalt pavement \[J\]. Journal of Wuhan University of Technology, 2012, 34(12): 52-56．(in Chinese)
WANG L, CUI S C, CHANG C Q. High temperature performance of warm mix crumb rubber modified asphalt based on rheological and viscoelastic theory \[J\]. Mate-rial Report, 2019, 33(7): 2386-2391．(in Chinese)
YANG Y, ZHANG K, JI D P. Study on anti-reflective cracking performance of rubber asphalt stress absorbing layer\[J\]. Chinese and Foreign Highways, 2013,33(6): 323-326．(in Chinese)
HUANG M, HUANG W D, LI B L, et al. Index for designing stress absorbing layer mixture based on fatigue performance \[J\]. Journal of Building Materials, 2014,17(1): 164-171．(in Chinese)
2020, Vol. 41 
