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Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder
Weihong Liu1, Yishen Xu2, Hongjun Wang1
1Jiangsu College of Engineering and Technology, Nantong 226007, China.
Materials (Basel, Switzerland)
|June 2, 2021
Summary
This study introduces a novel microwave and chemical activation (KMWR) method to enhance waste rubber powder modified asphalt. The KMWR method significantly improves asphalt storage stability, crack resistance, and fatigue performance.
Area of Science:
- Materials Science
- Civil Engineering
- Chemical Engineering
Background:
- Waste rubber powder (WR) modification of asphalt binders faces challenges with large-scale application due to poor storage stability.
- Improving the rheological properties and stability of WR-modified asphalt is crucial for its practical use.
Purpose of the Study:
- To develop and evaluate a composite activation method (microwave combined with chemical activation - KMWR) for waste rubber powder (WR).
- To enhance the storage stability and rheological properties of WR-modified asphalt binders.
Main Methods:
- Comparative analysis of virgin asphalt, microwave-activated WR (MWR) modified asphalt, and KMWR modified asphalt.
- Evaluation using standard segregation tests, bending beam rheometer (BBR), and dynamic shear rheometer (DSR).
- Characterization of activated WR particles using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) analysis.
Main Results:
- Composite activation significantly improved the storage stability of WR-modified asphalt.
- KMWR-modified asphalt exhibited enhanced crack resistance, rutting resistance, and fatigue performance.
- Activation process led to desulfurization of WR and grafting of active groups onto WR particles, improving compatibility.
Conclusions:
- The KMWR method effectively overcomes the limitations of WR modified asphalt, improving its performance and stability.
- Composite activation enhances the interfacial properties between WR and asphalt binder.
- This approach offers a promising solution for the sustainable utilization of waste rubber in asphalt applications.
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