ABSTRACT
The objective of this study is to investigate the correlation between the chemical properties of bio-oil form different sources on its road performance of asphalt binder. In this study, the bio-oil from the rapid pyrolysis of corn stalks with different states was chosen to prepare bio-asphalt binder. The SARA Four-component test and Gel Permeation Chromatography test were conducted to analyze the chemical properties of bio-asphalt binder, and the correlation between group components, molecular weight distribution and conventional road performance of bio-asphalt binder was established based on grey relation theory. The results show that the bio-oils mainly increase the content of small molecular components (M<1000) in asphalt binder, decrease the average molecular weight, and improve the polydispersity. The asphaltene content mainly determines the temperature sensitivity of asphalt binder, the resin affects the low-temperature performance indexes such as ductility and brittle point, while the saturation and aromatic mainly affect the viscoelastic properties. The average molecular weight of bio-asphalt affects its macro performance, and the polydispersity has a significant effect on the high-temperature stability. Finally, semi-liquid bio-oil, which is the mid-layer product of rapid pyrolysis of corn stalks, is recommended as the reasonable raw material for the preparation of bio-asphalt binder.
