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Study on Adhesion Property and Moisture Effect between SBS Modified Asphalt Binder and Aggregate Using Molecular
Fucheng Guo1, Jianzhong Pei1, Jiupeng Zhang1
1Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, China.
Materials (Basel, Switzerland)
|October 14, 2022
Summary
This study used molecular dynamics to investigate how styrene-butadiene-styrene (SBS) modified asphalt binder interacts with aggregates. Higher SBS content improves moisture resistance, with 4 wt.% potentially optimal for balancing dry adhesion and wet performance.
Area of Science:
- Materials Science
- Chemical Engineering
- Civil Engineering
Background:
- Asphalt binder performance is crucial for road durability.
- Understanding binder-aggregate interface mechanics is key to improving asphalt mixtures.
- Moisture damage significantly degrades asphalt pavement.
Purpose of the Study:
- To investigate the interface adhesion mechanism between SBS modified asphalt binder and aggregate.
- To evaluate the influence of SBS content on adhesion and moisture effects.
- To numerically assess adhesion and moisture resistance using molecular dynamics.
Main Methods:
- Molecular dynamics simulations were employed to model asphalt binder-aggregate interfaces.
- Double-layer adhesion models and triple-layer debonding models were constructed and equilibrated.
- The work of adhesion and work of debonding were numerically evaluated.
Main Results:
- SBS modified asphalt binder models demonstrated reliability.
- Work of adhesion decreased significantly above 6 wt.% SBS content.
- High SBS content (8-10 wt.%) improved moisture resistance by nearly 30%.
Conclusions:
- Adhesion is primarily due to Van der Waals energy.
- High SBS content enhances moisture resistance, indicated by Energy Ratio (ER) values.
- Optimal SBS content selection is critical for balancing dry adhesion and moisture resistance, with 4 wt.% suggested for optimal performance.
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