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Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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Performance Control and Mechanism Analysis of DCLR-Based Composite High-Modulus Asphalt Based on Synergistic
Bin Xu1,2, Xinjie Yu1,2, Aodong Gao1,2
1Research Institute of Highway Ministry of Transport, Beijing 100088, China.
Materials (Basel, Switzerland)
|March 28, 2026
Summary
A new composite modifier using direct coal liquefaction residue (DCLR), styrene-butadiene-styrene block copolymer (SBS), and styrene-butadiene rubber (SBR) significantly enhances asphalt performance. This advanced asphalt shows superior resistance to rutting, aging, and water damage, making it ideal for heavy-load traffic.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Science
Background:
- Heavy-load traffic in China causes early rutting distress in asphalt pavements.
- Existing asphalt modifiers have limitations in addressing severe distress under demanding conditions.
- Direct coal liquefaction residue (DCLR) offers potential as a modifier but requires optimization.
Purpose of the Study:
- To develop and optimize a novel composite modifier for asphalt pavements.
- To evaluate the performance enhancement of the composite-modified asphalt under various conditions.
- To investigate the suitability of the modified asphalt for heavy-load traffic and challenging climates.
Main Methods:
- Optimization of preparation process and formula using single-factor and orthogonal experiments.
- Systematic performance evaluation including conventional, water damage, aging, fatigue, and rheological properties.
- Comparative analysis against base asphalt and single/dual-component modified asphalts.
Main Results:
- Optimal preparation: 0.3 mm DCLR particle size, molten addition, 170 °C, 5000 r/min, 50 min shear.
- Optimal formula: 10% DCLR + 3% SBS + 2% SBR + 3% compatibilizer.
- Superior properties: Softening point 77.8 °C, rutting factor 10.8 kPa (6.43x base), TSR 94.6%, enhanced low-temp performance and durability.
Conclusions:
- The novel composite high-modulus modified asphalt demonstrates significantly improved overall laboratory performance.
- The modifier effectively addresses rutting distress and enhances resistance to aging and water damage.
- The modified asphalt shows promise for heavy-load traffic and complex climatic conditions, pending field validation.
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