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Fineness-Dependent Rheology and Chemothermal Modification Mechanism of RHB-SBS Composite-Modified Asphalt
Daming Wang1, Xinwen Hong1, Yuqi Song2,3
1College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
Polymers
|February 27, 2026
Summary
Rice husk biochar (RHB) and styrene-butadiene-styrene (SBS) enhance asphalt performance. Optimal RHB fineness (300 mesh) improves high-temperature stability and durability for sustainable pavements.
Area of Science:
- Materials Science
- Civil Engineering
- Environmental Science
Background:
- Agro-waste valorization is crucial for sustainable development.
- Improving asphalt performance is key for durable transportation infrastructure.
- Rice husk biochar (RHB) and styrene-butadiene-styrene (SBS) are potential asphalt modifiers.
Purpose of the Study:
- To investigate the synergistic effects of RHB and SBS on asphalt modification.
- To determine the optimal fineness and content of RHB for enhanced asphalt properties.
- To understand the interaction mechanisms between RHB, SBS, and asphalt.
Main Methods:
- Conventional performance tests (stiffness, ductility).
- Rheological measurements.
- Microstructural analyses (SEM, FTIR, TG-DSC).
Main Results:
- RHB fineness significantly impacts asphalt performance; 300 mesh is optimal.
- Increased RHB content (up to 16 wt%) enhances high-temperature performance.
- RHB forms a stable network, improving asphalt's thermal and high-temperature stability.
Conclusions:
- RHB-SBS modified asphalt offers improved high-temperature performance and durability.
- Optimal RHB fineness and content are critical for achieving desired asphalt properties.
- This approach efficiently utilizes agro-waste for green pavement materials.
