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ROSE bitumen: Mesoscopic model of bitumen and bituminous mixtures.

Claire A Lemarchand1, Michael L Greenfield2, Jeppe C Dyre3

  • 1CEA, DAM, DIF, 91297 Arpajon Cedex, France.

The Journal of Chemical Physics
|December 12, 2018
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Summary

A new mesoscopic model using dissipative particle dynamics accurately simulates bitumen and polymer-modified mixtures. It reveals how polymer interactions dramatically alter mechanical properties by forming large-scale structures.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Polymer Science

Background:

  • Bitumen and bituminous mixtures are complex materials with critical mechanical properties.
  • Understanding their behavior, especially when modified with polymers, is essential for various applications.
  • Existing models may not fully capture the mesoscopic dynamics and phase behavior.

Purpose of the Study:

  • To develop and validate a mesoscopic model for bitumen and polymer-modified bitumen mixtures.
  • To investigate the mechanical properties and dynamic behavior of these materials.
  • To explore the effects of polymer concentration and polymer-bitumen interactions on mixture properties.

Main Methods:

  • Dissipative Particle Dynamics (DPD) simulations were employed to model bitumen and bituminous mixtures.
  • The model incorporates different dynamical entities representing distinct time scales.
  • Mechanical properties were analyzed via stress relaxation functions and frequency-dependent viscoelasticity.
  • Longitudinal hydrodynamics and dynamic structure factors were used to analyze model dynamics.
  • Flory-Huggins analysis was applied to study polymer-bitumen interactions and phase segregation.

Main Results:

  • The model accurately reproduces the super-Arrhenius viscosity behavior of pure bitumen at low temperatures.
  • Viscoelastic properties show expected viscous behavior at low frequencies and elastic hardening at high frequencies.
  • Increasing repulsive interactions between polymer end-blocks and bitumen dramatically increases viscosity and shifts elastic behavior to lower frequencies.
  • Simulation data aligns with Flory-Huggins analysis, indicating polymer end-block segregation and the formation of large-scale structures.

Conclusions:

  • The developed mesoscopic model provides a powerful tool for simulating bitumen and polymer-modified mixtures.
  • Polymer-bitumen interactions, particularly repulsion, significantly influence mechanical properties through microphase separation and large-scale structure formation.
  • The model successfully links molecular-level interactions to macroscopic material behavior, offering insights into material design.