ARRB reviews the use of vehicle tyres in bitumen

The Australian Road Research Board (ARRB) is recommending further research into the use of passenger vehicle tyres in bitumen production.

ARRB Senior Professional Leader Guy Hand said Victoria’s Transport Department, formerly VicRoads, engaged ARRB to undertake a literature review on the subject.

“Using more end-of-life tyres in road construction is a known way to curb significant environmental challenge for Australia. The question is, how do we make that happen?,” Mr Hand said.

“One possibility is to engage the use of end-of-life car tyres.”

Most crumb rubber repurposed into Australian road construction currently comes from end-of-life truck tyres.

According to Mr Hand, truck tyres are predominantly composed of natural rubber, whereas car tyres contain a high proportion of synthetic rubber, as well as a nylon component.

“It is not well understood whether synthetic rubber will behave in bitumen in the same nature that natural rubber does,” Mr Hand said.

“No data from an Australian context is available to establish the compatibility and performance of synthetic rubber in bitumen.”

Mr Hand said the key objective of the review is to understand the current specifications of crumb rubber sourced by other road agencies, and the market availability and processing requirements of passenger vehicle tyres.

ARRB were additionally asked to identify the benefits and limitations of using passenger vehicle tyre crumb rubber as a road material in asphalt and sprayed seals.

“There are also barriers for recycling car tyres to be considered, such as economic, environmental and processing challenges,” Mr Hand said.

“With the Victorian Government’s focus on increasing the use of recycled materials in road construction, this literature review will help inform all stakeholders on the issues associated with the use of passenger vehicle tyres in bitumen.”

Related stories:

Volvo Cars commit to 25 per cent recycled plastics by 2025

Volvo Cars has announced that by 2025 at least 25 per cent of the plastics used in each new Volvo will be made from recycled material.

It has also urged the auto industry suppliers to work more closely with car makers to develop new sustainable components, especially when it comes to plastics.

Related stories:

The company has unveiled a new version of its XC60 T8 plug-in hybrid SUV that has several of its plastic components replaced with equivalents containing recycled materials.

The XC60’s interior has a console made from renewable fibres and plastics from discarded fishing nets and maritime ropes. The carpet contains fibres made from PET plastic bottles and a recycled cotton mix from clothing manufacturing offcuts.

The seats also contain material from PET bottles, with used car seats from old Volvo cars being used to create the sound absorbing material under the bonnet.

It follows the company’s announcement that it will electrify all new Volvo cars by 2019, stating that it aims to make fully electric cars 50 per cent of its global sales by 2025.

President and CEO of Volvo Cars Håkan Samuelsson said Volvo Cars is committed to minimising its global environment footprint.

Environmental care is one of Volvo’s core values and we will continue to find new ways to bring this into our business. This car and our recycled plastics ambition are further examples of that commitment,” he said.

Senior Vice President of Global Procurement at Volvo Cars Martina Buchhauser said the company already work with suppliers when it comes to sustainability.

“However, we do need increased availability of recycled plastics if we are to make our ambition a reality. That is why we call on even more suppliers and new partners to join us in investing in recycled plastics and to help us realise our ambition,” she said.

Image: Volvo Cars

Lomwest build wall of used tyres in WA

Tyre Stewardship Australia (TSA) accredited recycler, Lomwest Enterprises of Western Australia, has created a high-performance wall system made from baled used tyres contained within concrete skins.

These walls can be used as retaining walls, sound barriers, sea and blast walls, cyclone shelters and race track impact barriers.

Related stories:

TSA said in a statement that the modules for the flexible use wall system (called C4M) are manufactured offsite, allowing quick, easy and safe onsite construction. They can also have their outer surfaces architecturally modified to fit in with or enhance their environment.

Each C4M module contains 100 tightly baled used car tyres, sandwiched between precast panels and can be up to 2.4 metres in height. They also meet Australian and New Zealand stability, durability and relevant load standards, including for cyclone shelter construction and as fire rated partition walls.

Lomwest is just one of the many TSA accredited recyclers focused on developing, commercialising and promoting new uses for old tyres. The common feature of such new product development is a focus on creating better solutions for existing needs.

The TSA Market Development Fund is supporting a Curtin University independent assessment of the C4M walls. The objective being to fully quantify the benefits of the innovative wall system in a wide range of applications and therefore to expand the opportunities for beneficial use of end-of-life tyres.

“We are very pleased to be working with Lomwest and Curtin University on this exciting research,” said TSA Market Development Manager, Liam O’Keefe. “Developing the market for end-of-life tyres requires multiple outlets providing for a diverse range of applications. That includes a balance of refined-process powder and crumb using products and high-volume, low-process applications such as the C4M wall system.”