Li Yiming, Abdelmagid Alaaeldin A A, Qiu Yanjun, Yang Enhui, Chen Yanjun
Department of Civil Engineering, Northeast Forestry University, Harbin 150040, China.
Longjian Road and Brigde Co., Ltd., Harbin 150009, China.
Polymers (Basel). 2022 May 12;14(10):1969. doi: 10.3390/polym14101969.
In this paper, the rice husk ash and crumb rubber powder were used as a combined modifier for asphalt. The impact of the aging on the physical and rheological properties of crumb rubber powder, rice husk ash, and the combined modified asphalt was studied through the rolling thin film oven (RTFO) simulations. A Fourier-transform infrared Spectroscopy (FTIR) test was used to study the aging mechanisms of the combined crumb-rubber-powder- and rice-husk-ash-modified asphalt before and after aging through the changes in functional groups. Impacts of the combined, crumb rubber powder, and rice husk ash modifiers on the anti-aging characteristic of the asphalt binder were analyzed through different aging indices and the variations in intensity of the absorption peaks. According to the combined results, the addition of the combined crumb rubber powder, and rice husk ash could enhance the thermal oxidative aging resistance binder. Moreover, the optimal content of composite modified asphalt was (7% rice husk ash + 10% crumb rubber powder). In addition, the combined modified asphalt binder had all the peaks of neat asphalt, rice-husk-ash-modified asphalt, and crumb-rubber-powder-modified asphalt and no appearance of new peaks. A scanning electron microscope (SEM) test was carried out to observe the microstructure of the combined crumb-rubber-powder- and rice-husk-ash-modified asphalt binders. The obtained result demonstrated that different SEM images showed that the combined crumb rubber powder, and rice husk ash modifiers were uniformly dispersed inside the asphalt binder and consequently leading to format a homogeneous blended binder.
本文采用稻壳灰和胶粉作为沥青的复合改性剂。通过旋转薄膜烘箱（RTFO）模拟研究了老化对胶粉、稻壳灰及复合改性沥青物理和流变性能的影响。利用傅里叶变换红外光谱（FTIR）试验，通过官能团的变化研究了胶粉与稻壳灰复合改性沥青老化前后的老化机理。通过不同的老化指标和吸收峰强度变化，分析了胶粉、稻壳灰复合改性剂对沥青结合料抗老化特性的影响。综合结果表明，添加胶粉与稻壳灰复合改性剂可提高沥青结合料的热氧老化抗性。此外，复合改性沥青的最佳掺量为（7%稻壳灰+10%胶粉）。另外，复合改性沥青结合料具有纯沥青、稻壳灰改性沥青和胶粉改性沥青的所有峰，且未出现新峰。进行了扫描电子显微镜（SEM）试验，以观察胶粉与稻壳灰复合改性沥青结合料的微观结构。所得结果表明，不同的SEM图像显示胶粉与稻壳灰复合改性剂均匀分散在沥青结合料内部，从而形成均匀的混合结合料。
