Wang Guoqing, Wang Xinqiang, Lv Songtao, Qin Lusheng, Peng Xinghai
School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China.
Hebei Transportation Investment Group Corporation, Shijiazhuang 050091, China.
Materials (Basel). 2020 Oct 6;13(19):4437. doi: 10.3390/ma13194437.
Rubberized asphalt (RA) has been successfully applied in road engineering due to its excellent performance; however, the most widely used rubber content is about 20%.To improve the content of waste rubber and ensure its performance, seven rubberized asphalts with different powder content were prepared by high-speed shearing. Firstly, penetration, softening point, and ductility tests were carried out to investigate the conventional physical features of high-content rubberized asphalt (HCRA). Then, the dynamic shear rheometer test (DSR) was conducted to estimate the high-temperature rheological properties. The bending beam rheometer test (BBR) was carried out to evaluate the low-temperature rheological performance. Finally, combined with the macroscopic performance test, the modification mechanism was revealed by the Fourier transform infrared reflection (FTIR) test, and scanning electron microscope (SEM) analysis was used to observe the microscopic appearance before and after aging. The results show that rubberized asphalt has excellent properties in high- and low-temperature conditions, and fatigue resistance is also outstanding compared with neat asphalt. As the crumb rubber content increases, it is evident that the 40% RA performance is the best. The low-temperature properties of HCRA are better than the traditional 20% rubberized asphalt. This study provides a full test foundation for the efficient utilization of HCRA in road engineering.
橡胶粉改性沥青（RA）因其优异的性能已在道路工程中得到成功应用；然而，其最常用的橡胶粉含量约为20%。为提高废旧橡胶的含量并确保其性能，通过高速剪切制备了七种不同橡胶粉含量的橡胶粉改性沥青。首先，进行针入度、软化点和延度试验，以研究高含量橡胶粉改性沥青（HCRA）的常规物理特性。然后，进行动态剪切流变仪试验（DSR）以评估其高温流变性能。开展弯曲梁流变仪试验（BBR）以评价其低温流变性能。最后，结合宏观性能试验，通过傅里叶变换红外反射（FTIR）试验揭示改性机理，并利用扫描电子显微镜（SEM）分析观察老化前后的微观形貌。结果表明，橡胶粉改性沥青在高温和低温条件下均具有优异性能，与纯沥青相比，其抗疲劳性能也很突出。随着胶粉含量的增加，显然40%RA的性能最佳。HCRA的低温性能优于传统的20%橡胶粉改性沥青。本研究为HCRA在道路工程中的高效利用提供了全面的试验基础。
