The largest crumbed rubber asphalt demonstration project in Australia, providing 2000 tonnes of the sustainable pavement material in addition to 1200 tonnes of controlled asphalt mix is set to be paved across eight local Sydney council streets.

Comprising recycled rubber from end-of-life car and truck tyres, crumbed rubber asphalt aims to improve the sustainability and longevity of council roads.

The Reusing Rubber: Recycling Tyres for Roads demonstration project by Southern Sydney Regional Organisation of Councils (SSROC) aims to make council roads more sustainable, reduce capital and operating expenditure by extending road life, and create a local market for old car and truck tyres by incorporating crumb rubber in bitumen. An initial 3,600 standard passenger car tyres or 2,400 car and 490 truck tyres combined will be used in the crumbed rubber asphalt trial project.

Overseen by Boral, the test is partnering with eight of the 12 involved local councils in Sydney to pave a street in each area to explore varying levels of crumb rubber in a range of asphalt mixes. These include Bayside Council, Burwood Council, City of Sydney Council, Woollahra Council, Randwick City Council, Sutherland Shire Council, Northern Beaches Council, and Inner-west City Council.

Tim Richards, Executive General Manager, Asphalt at Boral, says: “We are pleased to be working with local governments as they innovate and move towards a circular economy to drive sustainability. This is a huge-scale project that will drive benefits for the broader industry and governments of all levels as we look to better understand how recycled rubber asphalt can be tweaked for maximum performance.

“It’s promising to see councils drive initiatives that demonstrate the benefits of repurposing waste, such as creating new roads through recycled tyres,” says Richards.

Over an initial 12-month period, the performance of each asphalt mix will be monitored in a range of applications and conditions to measure product benefits. The project will generate comprehensive data on the use of recycled rubber-based treatments on local roads and is expected to contribute to the development of crumb rubber asphalt specifications in future projects.

Crumbed rubber asphalt sees recycled rubber, traditionally in the form of a highly refined powder-like product but in this case wet blended prior to production, act as a binder in the construction of asphalt pavements and is designed to be significantly more durable and resilient than standard asphalt, with the rubber improving the standard properties of the bitumen component.

Research suggests crumbed rubber asphalt can double the life of a road.

Image: Supplied / Boral.

Branko Miletic

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