Performance evaluation of asphalt binder modified by bio-oil generated from waste wood resources

Bio-oils are thought to be potentials for petroleum asphalt binders used in asphalt pavement because of the renewability and environmental friendliness. The aim of this study is to investigate the performances of asphalt binders modified by bio-oils generated from waste wood resources. Three types of bio-oils generated from wood waste resources are used in this study: the original bio-oil (OB), de-watered bio-oil (DWB) and polymer modified bio-oil (PMB). OB, DWB and PMB were added into the base asphalt PG 58-28 at 5% and 10% by weight. The rotational viscometer (RV), dynamic shear rheometer (DSR), rolling thin film oven (RTFO), pressure aging vessel (PAV) and bending beam rheometer (BBR) were conducted to evaluate the rheological properties of bio-oil modified asphalt binders. The Superpave™binder specification was used to evaluate the performances of bio-oil modified asphalt binders. The test results show that the addition of bio-oil can lower the mixing temperature of asphalt mixtures while improve the high temperature performance of asphalt binders. However, the medium and low temperature performances were sacrificed. Comparison among the three types of bio-oil modified asphalt binders showed that PMB modified asphalt binders had the highest stiffness, followed by the DWB and OB modified binders. The OB had the lowest effect on the base asphalt binder compared to other two types of bio-oils