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Rheological Behaviors of Rubber-Modified Asphalt Under Complicated Environment
Xia Wu1, Chunfeng Zhu1, Zhenyu Wang1
1College of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China.
Polymers
|July 12, 2025
Summary
Crumb rubber powder improves asphalt stability in water and salt. Asphalt with rubber shows better performance after freeze-thaw cycles, especially in de-icing salt conditions, highlighting its potential for cold climate pavements.
Area of Science:
- Materials Science
- Civil Engineering
- Geotechnical Engineering
Background:
- Crumb rubber powder (RP) enhances asphalt binder mechanical properties.
- Limited research exists on RP-modified asphalt's viscoelastic behavior under freeze-thaw cycles in clean water and de-icing salt.
Purpose of the Study:
- To investigate microstructural evolution, compositional changes, and mechanical behavior of asphalt modified with rubber under freeze-thaw conditions.
- To evaluate the impact of clean water versus de-icing salt freeze-thaw cycles on asphalt-rubber performance.
Main Methods:
- Systematic investigation of asphalt modified with varying percentages of crumb rubber powder.
- Exposure to freeze-thaw cycles in both clean water and de-icing salt solutions.
- Analysis of microstructural evolution, compositional changes, and mechanical behavior, including creep recovery rates.
Main Results:
- RP incorporation accelerates oil precipitation, improving asphalt stability in aqueous and saline environments.
- Asphalt with 10% RP and 20% RP showed 50.53% and 28.94% higher creep recovery rates, respectively, under de-icing salt freeze-thaw compared to clean water freeze-thaw.
- The study provides quantitative data on the enhanced performance of RP-modified asphalt under specific environmental stressors.
Conclusions:
- Crumb rubber powder enhances the stability and viscoelastic performance of asphalt binders.
- De-icing salt freeze-thaw cycles have a significant, quantifiable impact on the performance of asphalt-rubber, often enhancing creep recovery.
- RP shows considerable potential for designing durable asphalt pavements in cold climates with frequent snowfall and low temperatures.
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