A Review on the Application of Bio-oil as an Additive for Asphalt

The rising cost of crude oil affects the asphalt paving industries and this in turns has encouraged researcher to modify or replace asphalt. The numbers of commercial vehicles increase every year. Hence, design, construction and maintenance of asphalt road facilities must be improved in order to provide the highest standards of safety and comfort, but certain areas of the road need some extra attention due to higher stressed than the others. For that reason road paving industry is interested in utilizing alternative and sustainable binder materials for modified asphalt to improve the production, placement and performance of asphalt mixtures. Nonetheless, sources of materials should be considered economically and environmentally viable after applying in pavement. According to previous research, the non crude petroleum binder was derived from the production of bio-oil through fast pyrolysis of biomass. The main source of bio-oil is from biomass industry or renewable organic industry such as timber waste, oil palm waste, rice husk, coconut trunk fibers, municipal waste and sugar cane waste. Alternatively, the bio-oil can be as substitute material as modification of asphalt. This paper presents a review of the source, characterization of bio-oil and the effects of bio-oil on the properties of asphalt.