Crumb rubber has been part of Australia’s road surfacing landscape for decades.
What is changing now is not the material itself, but government and industry confidence around its specification, procurement and routine delivery at scale.
Produced from end-of-life tyres and blended into bitumen to create rubber-modified binders, crumb rubber delivers measurable engineering benefits: Improved elasticity, enhanced resistance to cracking, fatigue and oxidative ageing, and longer-lasting pavement service life.
In practical terms, longer-lasting surfaces reduce the frequency of interventions, lower material consumption, and cut lifecycle emissions associated with resurfacing and traffic disruption.
The performance and sustainability of crumb rubber use is reinforced by a series of recent industry research and insights.
Released by Tyre Stewardship Australia (TSA), The Benefits of Surfacing Roads with Tyre Derived Crumb Rubber (September 2024), quantifies greenhouse gas reductions at the binder level and models emissions savings from extended pavement life, positioning crumb rubber as a sustainability solution.
Also released by TSA, Leading the Way: How Main Roads WA Transformed End of Life Tyres into Sustainable Road Infrastructure (November 2025), demonstrates how crumb rubber has been embedded at scale in Western Australia through phased rollout, defined binder classes and robust quality controls.
Complementing this, Australian Flexible Pavement Association (AfPA) released Crumb Rubber Modified Dense Graded Asphalt Model Specification – Light to Medium Duty Roads (October 2025), which provides a nationally consistent framework that confirms crumb rubber asphalt is ready to move beyond trials to routine delivery.
Together, these findings confirm that crumb rubber is no longer a niche or trial material. It is a specification-backed, performance-verified input ready for broader national uptake across Australia’s roads and infrastructure.
Western Australia, as well as Queensland provide the clearest proof point that crumb rubber can become embedded national practice.
From concept to consistency
Fulton Hogan, a champion of crumb rubber use, has long implemented the alternative material into a number of its projects.
Only recently, end-of-life tyres sourced from TSA Accredited recyclers were used across a three year project term, which included the design and fabrication of a mobile Bitumen Crumb Rubber blending plant to service markets in north Queensland.
Chris Lange, Technical Manager Infrastructure Services – Northern Region at Fulton Hogan, explains that the result was not a one-off success.
“Crumb rubber modified binders have a strong track record internationally, particularly in the United States and South Africa,” Lange says.
“In Australia, they have been used for many years in spray seals, and are widely adopted in Western Australia and Victoria.”
He notes that asphalt uptake is now accelerating as the durability benefits are better understood.
“These benefits include improved resistance to cracking, enhanced fatigue performance, greater durability and service life, and increased binder viscosity, which allows a thicker film of bitumen on the aggregate and contributes to longer-lasting pavements.”
Similarly, Main Roads Western Australia has approached crumb rubber with a long-term, performance-first mindset. Rather than mandating recycled content in isolation, the agency invested in research through the Western Australian Road Research and Innovation Program (WARRIP), developed defined binder products such as A18R and A10R, and implemented phased resurfacing targets that progressively increased adoption.
These attributes have been validated through operational resurfacing works, not limited trials. Defined quality standards, storage controls and construction tolerances have ensured that performance expectations translated into delivery outcomes. By the fifth year of the WARRIP rollout, crumb rubber applications had replaced previous specifications as business as usual.
The measurable sustainability impact follows from that consistency. Longer-lasting surfaces mean fewer interventions, reduced embodied emissions and lower disruption across the network.
The circular economy outcome of diverting end-of-life tyres from landfill and stockpiles is achieved as a by-product of performance-driven procurement.
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Specification as the enabler of scale
Historically, crumb rubber’s expansion was constrained less by engineering uncertainty and more by procurement friction. Specifications written for heavy-duty state highways were often applied to local networks, creating unnecessary complexity and limiting uptake.
Melissa Lyons, Executive Director Technology at AfPA, says the new CRM DGA model specification addresses that gap directly.
“Local governments need durable, sustainable asphalt solutions that can be delivered at scale and aligned to the realities of their networks,” Lyons says.
“Most existing crumb rubber specifications were developed for high-traffic, state-controlled roads. That approach does not reflect the dominant deterioration mechanisms on local roads, which are driven far more by surface ageing, oxidation and environmental exposure. It provides a fit-for-purpose, nationally consistent framework specifically designed for light-to-medium duty applications.
“In practical terms, it helps shift crumb rubber asphalt from being treated as a one-off innovation or trial product to a business-as-usual pavement option. It reduces uncertainty, supports reliable pricing and enables more consistent delivery outcomes.”
For asset managers, this is significant. Delivery confidence reduces risk premiums and encourages repeat use. Consistency in mix design, binder handling and compaction standards ensures that sustainability outcomes are supported by engineering rigour.
Supply confidence and procurement
Scaling crumb rubber also depends on supply certainty, particularly in regional markets.
Tammie Miller, Head of Market Development at Tyre Stewardship Australia, says reliability is central to broader uptake.
“Crumb rubber isn’t new. It’s been used in Australian roads since the 1970s. What’s changing now is how reliably and routinely it can be supplied and used,” Miller says.
TSA’s work with delivery partners to strengthen blending capability in regional areas reflects that focus on repeatability.
“Our role is to remove barriers and build confidence so crumb rubber can be used more consistently and at scale,” Miller says.
However, she makes it clear that voluntary adoption alone will not maximise wide-spread uptake across the sector.
“TSA’s modelling shows that if crumb rubber were mandated in road construction and maintenance where it is technically and economically feasible, around 159,000 tonnes of crumb rubber could be used annually, treating more than 26 million end-of-life tyres,” Miller says.
She adds that stronger procurement signals would align sustainability targets with performance-based specification, reinforcing the model nationally.
From proof point to pathway
The convergence of evidence and national specification work suggests that the roads and infrastructure sector is at an inflection point.
The Western Australian and Queensland projects have demonstrated that crumb rubber can deliver improved road performance and measurable sustainability outcomes when embedded within a disciplined specification and quality framework.
TSA’s research quantifies the lifecycle benefits. AfPA’s model specification provides the template for consistent local government adoption.
The emphasis is no longer on proving that crumb rubber can work. It is on ensuring that it works reliably, repeatedly and at scale.
For the roads and infrastructure sector, that shift matters. Sustainability in pavement construction is increasingly assessed through whole-of-life performance, not isolated recycled content percentages.
Materials that extend asset life while reducing emissions and supporting domestic recycling markets align directly with that objective.
Projects have already shown that crumb rubber can meet that test. The national frameworks now in place indicate the industry is prepared to replicate it.
The question now is not whether crumb rubber is viable. It is how quickly delivery confidence, specification alignment and procurement leadership will translate readiness into nationwide standard practice.
This article was originally published in the March edition of our magazine. To read the magazine, click here.
