This study examined the capability of phenol-rich bio-oils to improve the durability of bituminous composites by hindering oxidative aging in asphalt binder. Bio-oils derived from six wood-based bio-sources were introduced to asphalt binder, each specimen was then exposed to thermal aging. A chemical aging index was measured using Fourier-transform infrared spectroscopy, and a rheological aging index was measured using a dynamic shear rheometer. The results of the study showed that all phenol-rich bio-oils reduced the extent of aging in bio-modified binder, however, the bio-oils’ efficacy against aging varied, partly based on the content of their phenolic compounds. Computational modeling showed that the efficacy of each bio-oil is also affected by the molecular structures of its phenolic compounds, electron-donor substituents in the phenolic compound structure promote its antioxidant activity. The study outcomes show that using phenol-rich bio-oils can enhance the durability of asphalt binder while promoting a carbon-negative built environment.

本研究检测了富含酚的生物油通过阻止沥青结合料的氧化老化来提高沥青复合材料耐久性的能力。将来自六种木质生物源的生物油引入沥青粘合剂，然后将每个样品暴露于热老化。化学老化指数使用傅里叶变换红外光谱测量，流变老化指数使用动态剪切流变仪. 研究结果表明，所有富含酚的生物油都能降低生物改性粘合剂的老化程度，但是，生物油的抗老化功效各不相同，部分取决于其酚类化合物的含量。计算模型表明，每种生物油的功效还受其酚类化合物分子结构的影响，酚类化合物结构中的电子给体取代基促进其抗氧化活性。研究结果表明，使用富含酚的生物油可以提高沥青粘合剂的耐久性，同时促进碳负建筑环境。