College of Civil Engineering, Sanming University, Sanming, China.
Key Laboratory of Engineering Material & Structure Reinforement in Fujian Province Colleges (Sanming University), Sanming, China.
PLoS One. 2023 Jun 29;18(6):e0287732. doi: 10.1371/journal.pone.0287732. eCollection 2023.
The modifier of road materials from agricultural waste (AW) as raw material has been widely noticed. Considering the environmental impact of AW treatment and the National policy on the promotion of resource reuse, the feasibility of four AW (namely, bamboo powder, rape straw, corn cob, and wheat straw) for styrene butadiene styrene (SBS) asphalt modification is studied from the properties and mechanism perspectives. Through properties evaluation tests (such as the dynamic shear rheometer, multiple stress creep recovery, and rotating thin film oven test), the influence of four AW and different mixing amounts on the properties of SBS modified asphalt pavement is analyzed from the aspects of high-temperature deformation resistance and anti-aging properties. The results reveal that the four AW can improve the SBS asphalt's high-temperature deformation resistance and anti-aging properties, among which rape straw has the most significant improvement effect. In addition, through the fourier transform infrared spectroscopy test, the microscopic mechanism of the AW/SBS composite modified asphalt binder is revealed from the functional groups. The analysis shows that the AW is physically mixed with the SBS asphalt binder, which inhibits the growth of sulfoxide groups and the cracking of the SBS modifier during aging.
以农业废弃物（AW）为原料的道路材料改性已引起广泛关注。考虑到 AW 处理的环境影响以及国家关于促进资源再利用的政策，从性能和机理两方面研究了四种农业废弃物（竹粉、油菜秸秆、玉米芯和麦秸秆）对苯乙烯-丁二烯-苯乙烯（SBS）沥青改性的可行性。通过性能评价试验（如动态剪切流变仪、多重应力蠕变恢复和旋转薄膜烘箱试验），从高温抗变形能力和抗老化性能两个方面分析了四种农业废弃物及其不同掺量对 SBS 改性沥青路面性能的影响。结果表明，四种农业废弃物均可提高 SBS 沥青的高温抗变形能力和抗老化性能，其中油菜秸秆的改善效果最为显著。此外，通过傅里叶变换红外光谱试验，从官能团角度揭示了农业废弃物/SBS 复合改性沥青胶结料的微观机理。分析表明，农业废弃物与 SBS 沥青胶结料是物理混合的，在老化过程中抑制了亚砜基团的生长和 SBS 改性剂的断裂。
