Performance of Bio-based Warm Mix High-viscosity Asphalt and Its Mixtures
The bio-based stabilizers and bio-based warm mix additives was adopted to prepare two types of bio-based warm mix high viscosity asphalt(HVA70,HVA105),and a comparative analysis was conducted on their wetting characteristics,physical properties,microstructure,and rheological properties.On this basis,the reasonable cooling range of the asphalt mixture was determined by analyzing the void ratio as an indicator.Finally,the performance advantages of bio-based warm mix high viscosity asphalt mixture were verified through pavement performance tests.The results showed that compared to HVAO,bio-based warm mix high viscosity asphalt has a smaller contact angle at the same temperature,better adhesion with aggre-gates,and better spreading and wetting effects.It also has better compatibility and reactions with other compo-nents.Bio-based warm mix high viscosity asphalt has better low temperature cracking resistance,construc-tion and workability,and resistance to permanent deformation.Even with a cooling range of 20 ℃ for HVA70 and 30 ℃ for HVA105 as the binder,it still exhibits superior performance in terms of high and low tempera-ture resistance and resistance to water damage.
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