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Twin-Screw Extrusion Desulfurized Crumb Rubber Modified Asphalt: High-Temperature Rheology and Viscoelastic
Hongying Zhang1, Hongqi Zhao2, Changjian Fu3
1School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Materials (Basel, Switzerland)
|August 13, 2026
Summary
This study enhanced waste tire rubber powder for asphalt modification. Shell 90# desulfurized rubber powder-modified asphalt showed superior high-temperature performance and resistance to permanent deformation.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Chemistry
Background:
- Waste tire rubber powder is a promising modifier for asphalt.
- Improving rubber powder-asphalt compatibility and high-temperature performance is crucial for pavement durability.
Purpose of the Study:
- To enhance waste tire rubber powder modification in asphalt using desulfurization.
- To evaluate the high-temperature performance of modified asphalt with varying rubber powder solubilities.
Main Methods:
- Twin-screw extrusion was used to prepare desulfurized rubber powder with different solubilities.
- Modified asphalt was produced using three base asphalt types (Shell 90#, Zhenhai 90#, GS 90#).
- Dynamic Shear Rheometry (DSR), Multi-Stress Creep Recovery (MSCR), and frequency scanning were employed.
Main Results:
- Desulfurization significantly improved rubber powder solubility and asphalt compatibility.
- Shell 90# desulfurized rubber powder-modified asphalt demonstrated the best high-temperature stability and rutting resistance.
- MSCR tests confirmed superior creep recovery and reduced permanent deformation for Shell 90# modified asphalt.
Conclusions:
- Desulfurized rubber powder effectively enhances asphalt properties, particularly at high temperatures.
- Shell 90# modified asphalt offers optimal viscoelastic balance and microstructural stability.
- Findings support the use of this modified asphalt in hot and humid climates.
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