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<p>This study adopts a combined method of dissipative particle dynamics (DPD) simulation and macroscopic-microscopic experiments to investigate the rheological behavior of waste vegetable oil (WVO)-modified bio-asphalt at multiple scales. Analysis of the physicochemical properties of WVO and 70# petroleum asphalt revealed that WVO has a significantly higher oxygen content than 70# base asphalt, with acid substances accounting for over 50% of its composition, giving it a more stable colloidal structure. All-atom models of WVO and base asphalt were established, and a DPD force field was constructed. Through DPD simulation, the aggregation-diffusion behaviors and shear rheological properties of bio-asphalt were revealed at the mesoscopic scale. The results show that the diffusion coefficient of bio-asphalt is close to the test value, verifying the reliability of the bio-asphalt coarse-grained model. With the increase of WVO content, the diffusion coefficients of each component in bio-asphalt increase, the diffusion capacity of asphaltenes is enhanced, and asphaltene aggregates decrease, resulting in asphalt softening. The depolymerization effect of WVO on asphaltene aggregates makes the viscous modulus dominate in the shear field. The macroscopic rheological properties of bio-asphalt with different WVO contents were analyzed through penetration, softening point, ductility, rotational viscosity, dynamic shear rheological and bending beam rheological tests. Grey entropy correlation analysis was introduced to quantify the degree of influence of key factors on the high and low-temperature rheological behaviors of bio-asphalt. The results indicate that while maintaining rheological properties similar to base asphalt, bio-asphalt exhibits significant softening effect, viscosity-reducing characteristic and better low-temperature performance, which is consistent with simulation predictions. The rutting factor of bio-asphalt is correlated with rotational viscosity (135 ℃), softening point, penetration, temperature, and WVO content, with rotational viscosity showing the most dominant influence.</p>

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Multi-scale Study on Rheological Behavior of Bio-asphalt: Combining DPD Simulation with Macroscopic Experiments

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Shangwei Gong,
  • Wenyu Mou,
  • Hongjun Liu,
  • Xuejuan Cao,
  • Ying Yuan,
  • Guiying Tan,
  • Lihong He

摘要

This study adopts a combined method of dissipative particle dynamics (DPD) simulation and macroscopic-microscopic experiments to investigate the rheological behavior of waste vegetable oil (WVO)-modified bio-asphalt at multiple scales. Analysis of the physicochemical properties of WVO and 70# petroleum asphalt revealed that WVO has a significantly higher oxygen content than 70# base asphalt, with acid substances accounting for over 50% of its composition, giving it a more stable colloidal structure. All-atom models of WVO and base asphalt were established, and a DPD force field was constructed. Through DPD simulation, the aggregation-diffusion behaviors and shear rheological properties of bio-asphalt were revealed at the mesoscopic scale. The results show that the diffusion coefficient of bio-asphalt is close to the test value, verifying the reliability of the bio-asphalt coarse-grained model. With the increase of WVO content, the diffusion coefficients of each component in bio-asphalt increase, the diffusion capacity of asphaltenes is enhanced, and asphaltene aggregates decrease, resulting in asphalt softening. The depolymerization effect of WVO on asphaltene aggregates makes the viscous modulus dominate in the shear field. The macroscopic rheological properties of bio-asphalt with different WVO contents were analyzed through penetration, softening point, ductility, rotational viscosity, dynamic shear rheological and bending beam rheological tests. Grey entropy correlation analysis was introduced to quantify the degree of influence of key factors on the high and low-temperature rheological behaviors of bio-asphalt. The results indicate that while maintaining rheological properties similar to base asphalt, bio-asphalt exhibits significant softening effect, viscosity-reducing characteristic and better low-temperature performance, which is consistent with simulation predictions. The rutting factor of bio-asphalt is correlated with rotational viscosity (135 ℃), softening point, penetration, temperature, and WVO content, with rotational viscosity showing the most dominant influence.