Biomass-Derived Bio-Oil for Asphalt Binder Applications: Production Feasibility and Performance Enhancement

Biomass offers a renewable pathway for sustainable infrastructure, particularly in bio-oil production from biomass through processes such as fast pyrolysis to be used as an alternative to asphalt binders. This review explores biomass sources, production techniques, and the role of bio-oil in addressing the demand for eco-friendly materials in the pavement construction industry. The review also examines the upgrading processes of bio-oil, its physical and chemical properties, and its application in producing bio-modified asphalt binder (BMA). The use of bio-oils in asphalt binders not only reduces the carbon footprint but also promotes the utilization of renewable resources, contributing to a more sustainable pavement industry. Additionally, bio-oil incorporation enhances asphalt binder performance by improving rutting resistance at high temperatures and stiffness at low temperatures, while reducing susceptibility to low-temperature cracking. Challenges include variability in high-temperature performance and moisture sensitivity. Based on the findings of this comprehensive review, future research directions should focus on optimizing production processes, broadening biomass feedstocks, and mitigating moisture issues to align bio-oil properties with asphalt binder specifications.