Soft plastic packaging recycled into sustainable concrete

Soft plastic packaging recycled into sustainable concrete

RMIT research has helped create concrete made with soft plastic in a redeveloped carpark – the first time the circular-economy technology has been used in an Australian commercial project.

Australians return 1.3 million pieces of soft plastic per day to REDCycle recycling bins but wrappers, cling wraps and plastic bags have been a problematic plastic to recycle.

With new legislation to phase out soft plastic exports taking effect only last week, this project highlights an innovative solution to the problem.

But an RMIT team of engineers have partnered with Victorian recycling organisations Replas, RED Group and SR Engineering to develop a concrete material made from lightweight recycled plastic.

RMIT’s Dr Jonathan Tran and his team worked with industry to include Polyrok – a plastic aggregate made from soft plastics – which was used in the concreting of Coles Horsham’s car park and a footpath in the City of Frankston.

RMIT collaborated with Replas, RED Group and SR Engineering to develop the mix methodology and material characterisation for the Polyrok material.

Diagram of the Polyrok technology RMIT researchers used X-Ray computed tomography to design optimal strength and acoustic energy absorption.

Tran said his team were able to identify the best strategy to design the concrete mix, optimising the strength and acoustic energy absorption of the material.

“Glass can be easily recycled and turned into things such as sand replacement, but plastic is much harder,” he said.

“Mixing concrete and plastic is difficult, as the two don’t naturally bond.

“Replas and SR Engineering came to RMIT because of our unique facilities to develop the best way to bond the two components together.”

•

Tran said the opportunity to work with industry and create a considerable impact to society was a rewarding experience.

“Since the partnership, our industry partners Replas, Red Group and Coles have diverted over 1.3 billion pieces of soft plastic from landfill,” he said.

Tran said there is the potential for 105,000 tonnes of soft plastics to be converted into the dense plastic aggregate every year in a local factory in Melbourne.

Spreading the Polyrok concrete. Polyrok, the sustainable aggregate alternative, has enhanced durability and is lighter to work with.

The Coles car park in Horsham alone saw over 900,000 pieces of plastic packaging saved from landfill and incorporated into the concrete.

“In the future, we’re hoping to explore the production of sustainable concrete structures using a new large-scale concrete 3D printer at RMIT’s Bundoora campus.”

The project was led by Senior Lecturer Dr Jonathan Tran from the School of Engineering with support from two research fellows, Dr Rajeev Roychand and Dr Thomas Loh.

 

Story: Caleb Scanlon and Femke Bertsche

11 January 2021

Share

11 January 2021

Share

  • Sustainability
  • Science and technology
  • Industry
  • Property & Construction
Engage

Related News

news-coffeeconcretesupport-1220px.jpg

Coffee concrete shortlisted for national research impact award

Universities Australia has shortlisted RMIT University’s coffee concrete innovators for the upcoming 2024 Shaping Australia Awards in the Problem Solver category.

Future Europe Series France.jpg

Future Europe Series: Latest report aims to support French investment in Victoria

The latest report out of the Future Europe Series delivered by RMIT Europe and the State of Victoria’s European Trade and Investment office, has made recommendations in skills and talent, innovation and digitalisation for French companies investing in Victoria, Australia.

Bird's eye view of the coffee concrete footpath being laid along a busy road in Pakenham. Credit: Pete Glenane, HiVis Pictures

Coffee concrete makes its debut in a major infrastructure project

An innovation developed at RMIT University has been used for the first time in a major infrastructure project, being laid into a footpath along a busy road in Pakenham as part of Victoria’s Big Build.

news-coffee-footpath-team-1220px.jpg

RMIT and council trial world-first coffee concrete footpath

Freshly brewed coffee concrete may be coming to a street near you after RMIT University teamed up with Macedon Ranges Shire Council to conduct a world-first coffee concrete footpath trial.

Show more
aboriginal flag
torres strait flag

Acknowledgement of Country

RMIT University acknowledges the people of the Woi wurrung and Boon wurrung language groups of the eastern Kulin Nation on whose unceded lands we conduct the business of the University. RMIT University respectfully acknowledges their Ancestors and Elders, past and present. RMIT also acknowledges the Traditional Custodians and their Ancestors of the lands and waters across Australia where we conduct our business - Artwork 'Sentient' by Hollie Johnson, Gunaikurnai and Monero Ngarigo.

More information