Towards oxidative aging-resistant design of SBS-modified asphalt mixtures: Role of oxygen diffusion and pore structure

Key Points

• This study aims to understand how oxygen diffusion affects the durability of SBS-modified asphalt mixtures.
• Analyzed the physical pore pathways and their impact on oxygen diffusion in asphalt mixtures.
• Developed quantitative predictive models based on the oxygen diffusion coefficient to forecast asphalt durability.
• Assessed the relationship between oxygen permeability and thermal-oxidative degradation severity.
• Higher oxygen permeability accelerates long-term thermal-oxidative degradation of asphalt mixtures.
• Quantitative models accurately predict asphalt durability based on the established oxygen diffusion coefficient.
• Physical pore pathways are more influential than thermal effects in driving oxygen diffusion.