Enhancing Rail Track Stability with Rubber-Based Absorbing Layers

Overview

Tyre Stewardship Australia (TSA) supported a research initiative examining the use of rubber-based energy absorbing layers (REAL) beneath railway ballast. The project aimed to assess whether incorporating recycled tyre materials could enhance track stability, reduce maintenance needs, and contribute to sustainable rail infrastructure.​

Project Details

The study focused on the application of REAL as a capping stratum beneath the ballast layer. Specifically, it involved utilizing whole tyres with one sidewall removed, filled with aggregate, to absorb vibrations and distribute loads more evenly. This configuration was tested to determine its effectiveness in minimizing track degradation and extending the lifespan of rail components.​

Key findings from the research included:​

• Vibration Reduction: The REAL system demonstrated a capacity to absorb dynamic loads, thereby reducing vibrations transmitted through the track structure.​
• Enhanced Ballast Performance: By mitigating stress concentrations, the rubber-based layer helped in preserving the integrity of the ballast, leading to decreased particle breakage and settlement.​
• Sustainability Benefits: The approach provided a practical use for end-of-life tyres, aligning with circular economy principles and reducing environmental impact.​

Environmental Impact

Implementing REAL in rail construction offers a sustainable solution for repurposing end-of-life tyres. By integrating recycled rubber into track substructures, the project contributes to reducing tyre waste and promoting circular economy practices within the rail industry.​

Conclusion

The successful application of recycled rubber in rail track systems underscores the material's viability in infrastructure projects. These initiatives not only improve the durability and stability of rail tracks but also align with TSA's mission to find sustainable end-uses for tyre-derived products.​