• Scientific Research •

### Study on the low-temperature properties of the asphalt modified by carbon nanotubes (CNTs) and crumb rubber (CR)

• Received:2021-06-09 Revised:2022-01-08 Online:2022-03-30 Published:2022-03-30
• Contact: Mulian Zheng E-mail:zhengmulian@163.com
• Supported by:
National Natural Science Foundation of China;Technology Innovation Project of Shandong Department of Industry and Information;Transportation Department of Shandong Province;Traffic Science and Technology Project of Xixian New District Management Committee of Shaanxi Province;Zhuhai Transportation Group Co. LTD

Abstract: The effect of adding crumb rubber (CR) and carbon nanotubes (CNTs) on the low-temperature properties of virgin asphalt was studied. Using the force-ductility test and the bending beam rheometer (BBR) test, the deformation resistance and rheological properties of asphalt samples at low temperatures were evaluated, respectively. Based on the result of BBR test, the creep functions of the Burgers model and the Zener model were used to fit the low-temperature creep characteristics of the asphalt samples. Furthermore, the differential scanning calorimetry (DSC) test and the attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) test were utilized to appraise the low-temperature stability and chemical properties of asphalt samples, respectively. The results showed that CR significantly improved the lowtemperature properties of virgin asphalt, while CNTs had little effect. Moreover, during the degradation of CR, aromatic and aliphatic components were released. In particular, the aliphatic components of CR-modified asphalt were much higher than those of virgin asphalt, which had a significant effect on improving the low-temperature properties of the asphalt. The DSC test results showed that CR enhanced the low-temperature stability of the asphalt, while the addition of CNTs presented a slightly negative effect.