Using alternative extender as a substitute for bitumen is one of the most effective approaches to construct asphalt pavements. In this study, the feasibility of using lignin as an extender for bitumen was investigated. According to the literature review and preliminary tests, the ratio of bitumen to lignin was fixed at 4:1 by mass. The viscosity measurement determined the workability of lignin modified bitumen (LMB). Rheological properties in a broader temperature range were investigated through the dynamic shear rheometer (DSR) and bending beam rheometer (BBR). The anti-aging performance of LMB was estimated by employing the thin-film oven test (TFOT) and Fourier Transform Infrared Spectroscopy (FTIR). Besides, the storage stability of LMB was discussed in terms of morphology, lignin concentration, and mechanical properties. Lastly, the thermal stability of LMB was examined to eliminate the safety concern in construction. The results indicated that lignin showed explicit chemical activities (associated hydroxyl -OH and carbonyl groups -C=O), which significantly affected the bitumen properties from varying perspectives. The stiffness of bitumen increased, and the temperature susceptibility of bitumen was reduced after the incorporation of lignin. Meanwhile, the mixing and paving temperatures for the pavement construction increased by over 10°C. The presence of abundant associated hydroxyl in lignin was the primary factor that changes the anti-aging capacity of bitumen. The problem of lignin segregation was reasonably serious but was solved by adding additives. In general, the lignin could be a decent extender for bitumen with the appropriate procedure in practice.

使用替代的增量剂代替沥青是构造沥青路面最有效的方法之一。在这项研究中，研究了使用木质素作为沥青填充剂的可行性。根据文献综述和初步测试，沥青与木质素的质量比固定为4：1。粘度测量确定了木质素改性沥青（LMB）的可加工性。通过动态剪切流变仪（DSR）和弯曲束流变仪（BBR）研究了在较宽温度范围内的流变性能。通过使用薄膜烘箱测试（TFOT）和傅里叶变换红外光谱（FTIR）评估LMB的抗老化性能。此外，从形态，木质素浓度和机械性能方面讨论了LMB的储存稳定性。最后，对LMB的热稳定性进行了检查，以消除施工中的安全隐患。结果表明，木质素显示出明显的化学活性（缔合的羟基-OH和羰基-C = O），从不同的角度显着影响沥青的性能。木质素掺入后，沥青的刚度增加，沥青的温度敏感性降低。同时，人行道施工的混合和摊铺温度提高了10°C以上。木质素中大量缔合羟基的存在是改变沥青抗老化能力的主要因素。木质素分离的问题相当严重，但是通过添加添加剂解决了。通常，木质素可以在实践中采用适当的程序，作为沥青的良好增量剂。