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Properties Analysis of Asphalt Binders Containing Bayer Red Mud
Liyang Yao1, Wenying Gao1, Xianwei Ma1
1School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467036, China.
Materials (Basel, Switzerland)
|March 7, 2020
Summary
Bayer red mud powder (RMP) effectively enhances asphalt binder performance by increasing softening points and improving high-temperature properties. Optimal performance, considering construction, is achieved with 75% or 100% RMP replacement, with specific filler-to-asphalt ratios recommended.
Area of Science:
- Materials Science
- Civil Engineering
- Geotechnical Engineering
Background:
- Traditional asphalt binders utilize limestone powder (LSP) as a filler.
- Bayer red mud powder (RMP) is investigated as a sustainable alternative filler.
- Optimizing filler-to-asphalt (F/A) ratios is crucial for binder performance.
Purpose of the Study:
- To evaluate the performance of asphalt binders modified with Bayer red mud powder (RMP).
- To compare RMP performance against traditional limestone powder (LSP).
- To determine optimal replacement rates and F/A ratios for enhanced binder properties.
Main Methods:
- Asphalt binders were modified with RMP at replacement rates of 0%, 25%, 50%, 75%, and 100%.
- Seven filler-to-asphalt (F/A) ratios (0.3 to 2.1) were tested for each filler type.
- Performance was evaluated using penetration, softening point, rotational viscosity (RV), dynamic shear rheometry (DSR), and bending beam rheometry (BBR) tests.
Main Results:
- Increasing F/A ratio linearly decreased penetration; RMP binders showed lower penetration than LSP binders.
- RMP addition increased softening points and significantly improved high-temperature performance, especially at 75% replacement.
- BBR tests indicated increased stiffness (S) and decreased m-values with higher RMP content, with all binders failing to meet Superpave low-temperature requirements without adjusted F/A ratios.
Conclusions:
- Bayer red mud powder (RMP) positively impacts asphalt binder properties, enhancing stiffness and high-temperature stability.
- Optimal F/A ratios for meeting Superpave low-temperature requirements vary with RMP content, ranging from 1.3 (0% RMP) to 0.9 (100% RMP).
- For economic and construction considerations, RMP75 and RMP100 at a maximum F/A ratio of 1.1 are recommended for asphalt binders.
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