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Temperature Sensitivity Characteristics of SBS/CRP-Modified Bitumen after Different Aging Processes
Rui He1,2, Shuhua Wu3, Xiaofeng Wang4
1School of Materials Science and Engineering, Chang'an University, Xi'an 710061, Shaanxi, China. heruia@163.com.
Materials (Basel, Switzerland)
|November 2, 2018
Summary
Styrene-butadiene-styrene polymer/crumb rubber powder (SBS/CRP)-modified bitumen exhibits excellent temperature sensitivity and low-temperature crack resistance. This modified bitumen shows superior aging resistance, making it ideal for cold plateau environments.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Science
Background:
- Bitumen's temperature sensitivity is crucial for pavement performance.
- Modifiers like polymers and rubber powder are used to enhance bitumen properties.
- Aging significantly affects bitumen's characteristics, impacting its service life.
Purpose of the Study:
- To analyze the temperature sensitivity of bitumen modified with Styrene-butadiene-styrene polymer/crumb rubber powder (SBS/CRP).
- To evaluate the impact of aging on the properties of SBS/CRP-modified bitumen.
- To investigate the relationship between microstructures and macroscopic properties of modified bitumen.
Main Methods:
- Preparation of original, SBS-modified, and SBS/CRP-modified bitumen specimens.
- Dynamic rheological property testing to assess temperature sensitivity.
- Low-temperature performance tests for crack resistance evaluation.
- Infrared spectrum analysis to study functional group changes during aging.
Main Results:
- SBS/CRP-modified bitumen demonstrated enhanced temperature sensitivity and excellent low-temperature performance.
- The modified bitumen exhibited strong anti-aging properties, maintaining flexibility and structure after aging.
- Aging had minimal impact on SBS/CRP-modified bitumen, unlike original or SBS-modified bitumen.
- Physical blending was the dominant interaction between bitumen and crumb rubber powder.
Conclusions:
- SBS/CRP modification significantly improves bitumen's temperature sensitivity and low-temperature crack resistance.
- SBS/CRP-modified bitumen offers superior aging resistance compared to other types.
- This material is highly recommended for applications in cold plateau regions with harsh environmental conditions.
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