Aging indices.

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（Agricultural Waste, AW）为原料制备的道路材料改性剂已受到广泛关注。考虑到农业废弃物处理的环境影响以及国家推广资源再利用的政策导向，本文从性能与机理双视角出发，研究了四类农业废弃物——即竹粉、油菜秸秆、玉米芯与小麦秸秆——用于丁苯橡胶（Styrene Butadiene Styrene, SBS）改性沥青的改性可行性。通过动态剪切流变试验、多应力蠕变恢复试验与旋转薄膜烘箱试验等性能评价手段，从抗高温变形性能与抗老化性能两个维度，分析了四类农业废弃物及其掺量对SBS改性沥青路面性能的影响规律。研究结果表明，四类农业废弃物均可有效提升SBS改性沥青的抗高温变形与抗老化性能，其中油菜秸秆的改性提升效果最为显著。此外，通过傅里叶变换红外光谱（Fourier Transform Infrared Spectroscopy）试验，从官能团层面揭示了农业废弃物/SBS复合改性沥青胶结料的微观改性机理。分析显示，农业废弃物与SBS沥青胶结料为物理共混状态，该作用可抑制老化过程中亚砜基的生成与SBS改性剂的降解开裂。