Tyre-Derived Aggregate: Enhancing Pavement Sub-bases for Sustainable Infrastructure

Overview

Tyre Stewardship Australia (TSA), in collaboration with VicRoads and Sustainability Victoria, initiated a research project to evaluate the feasibility of using tyre-derived aggregate (TDA) as a supplementary material in pavement sub-bases. This initiative aims to identify sustainable alternatives to traditional materials, promoting the recycling of end-of-life tyres and enhancing the performance of road infrastructures.​

Project Details

The research focused on characterising and assessing the engineering properties of TDA when combined with recycled crushed concrete and crushed rock. Laboratory tests and field evaluations were conducted to determine the structural integrity, durability, and environmental impact of these composite materials in pavement sub-base applications.

Key aspects of the study included:​

• Material Compatibility: Investigating the blending ratios of TDA with conventional aggregates to achieve optimal performance.​
• Load-Bearing Capacity: Assessing the ability of TDA-enhanced sub-bases to withstand traffic loads and environmental stresses.​
• Drainage Properties: Evaluating the permeability of the composite materials to ensure proper water drainage and prevent sub-base deterioration.​

Environmental Impact

Integrating TDA into pavement sub-bases offers a sustainable solution for repurposing end-of-life tyres, reducing landfill waste, and conserving natural resources. By substituting a portion of traditional aggregates with recycled tyre materials, the project supports circular economy principles and contributes to the development of greener infrastructure.​

Conclusion

The successful application of TDA in pavement sub-bases demonstrates its potential as a viable alternative to conventional materials. This research underscores the importance of innovative approaches in infrastructure development, aligning with TSA's mission to promote sustainable practices and enhance the utilisation of recycled tyre products in the construction industry.