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Adhesion Characteristics of an Asphalt Binder-Aggregate Interface Based on Molecular Dynamics
Hao Xiang1, Zhengxing Wang2, Mingyang Deng1
1College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China.
Materials (Basel, Switzerland)
|March 13, 2025
Summary
Styrene-butadiene-styrene (SBS) modified asphalt shows better adhesion to aggregates than base asphalt, resisting moisture damage. Aging asphalt reduces its adhesion performance, impacting pavement durability.
Area of Science:
- Materials Science
- Civil Engineering
- Chemical Engineering
Background:
- Asphalt binder-aggregate interface properties are crucial for pavement performance and durability.
- Understanding interfacial adhesion is key to preventing moisture damage in asphalt mixtures.
Purpose of the Study:
- To investigate the adhesion properties of asphalt binder-aggregate interfaces using experimental and simulation methods.
- To evaluate the effects of aging and styrene-butadiene-styrene (SBS) modification on asphalt adhesion.
- To analyze the influence of aggregate type (limestone and basalt) on interfacial energy.
Main Methods:
- Contact angle tests were performed on various asphalt types (base, aged, SBS modified) and aggregates (limestone, basalt).
- Molecular dynamics simulations were employed to analyze interfacial adhesion characteristics at the molecular level.
- Interfacial energy was calculated to quantify adhesion under different conditions, including moisture penetration.
Main Results:
- Experimental and molecular dynamics simulation results showed good consistency.
- SBS modified asphalt exhibited superior surface free energy and adhesion compared to base asphalt.
- Asphalt aging significantly reduced adhesion performance, while SBS modification enhanced it, improving resistance to moisture damage.
Conclusions:
- The molecular composition of asphalt and aggregates dictates interfacial energy.
- SBS modification enhances asphalt-aggregate adhesion, crucial for mitigating moisture damage in pavements.
- Findings provide valuable insights for selecting, modifying, and optimizing asphalt pavement materials.
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