PPE can be recycled to make stronger concrete

PPE can be recycled to make stronger concrete

Engineers at RMIT University have developed a method to use disposable personal protective equipment (PPE) to make concrete stronger, providing an innovative way to significantly reduce pandemic-generated waste.

The RMIT team is the first to investigate the feasibility of recycling three key types of PPE – isolation gowns, face masks and rubber gloves – into concrete.

Published in the journals Case Studies in Construction Materials, Science of the Total Environment and Journal of Cleaner Production, the studies by RMIT School of Engineering researchers demonstrate the potential for PPE to be used as reinforcement materials in structural concrete.

The studies found shredded PPE could increase the strength of concrete by up to 22% and improve resistance to cracking.

The RMIT School of Engineering team’s industry partner, Casafico Pty Ltd, is planning to use these research findings in a field project.

Vice-Chancellor’s Indigenous Pre-Doctoral Fellow at RMIT and co-researcher Shannon Kilmartin-Lynch with the team’s concrete that was made using PPE. Credit: RMIT University Vice-Chancellor’s Indigenous Pre-Doctoral Fellow at RMIT and co-researcher Shannon Kilmartin-Lynch with the team’s concrete that was made using PPE. Credit: RMIT University

Since the start of the COVID-19 pandemic, an estimated 54,000 tonnes of PPE waste has been produced on average globally each day. About 129 billion disposable face masks are used and discarded around the world every month.

First author, PhD researcher Shannon Kilmartin-Lynch, said the research brought a circular economy approach to the challenge of dealing with healthcare waste.

“We urgently need smart solutions for the ever-growing pile of COVID-19 generated waste – this  challenge will remain even after the pandemic is over,” said Kilmartin-Lynch, a Vice-Chancellor’s Indigenous Pre-Doctoral Fellow at RMIT.

“Our research found that incorporating the right amount of shredded PPE could improve the strength and durability of concrete.

The RMIT team’s concrete that was made using PPE. Credit: RMIT University The RMIT team’s concrete that was made using PPE. Credit: RMIT University

Joint lead author, Dr Rajeev Roychand, said there was real potential for construction industries around the world to play a significant role in transforming this waste into a valuable resource.

“While our research is in the early stages, these promising initial findings are an important step towards the development of effective recycling systems to keep disposable PPE waste out of landfill,” he said.

Strength and flexibility

In three separate feasibility studies, disposable face masks, rubber gloves and isolation gowns were first shredded then incorporated into concrete at various volumes, between 0.1% and 0.25%.

The research found:

  • rubber gloves increased compressive strength by up to 22%  
  • isolation gowns increased resistance to bending stress by up to 21%, compressive strength by 15% and elasticity by 12%
  • face masks increased compressive strength by up to 17%
The RMIT research team: Dr Rajeev Roychand, Dr Mohammad Saberian, PhD scholar Shannon Kilmartin-Lynch, Professor Jie Li and Professor Kevin Zhang. Credit: RMIT University The RMIT research team: Dr Rajeev Roychand, Dr Mohammad Saberian, PhD scholar Shannon Kilmartin-Lynch, Professor Jie Li and Professor Kevin Zhang. Credit: RMIT University

Corresponding author and research team leader Professor Jie Li said PPE waste – both from health care and the general public – was having a significant impact on the environment.

“We have all seen disposable masks littering our streets, but even when this waste is disposed of properly it all ends up in landfill,” Li said.  

“With a circular economy approach, we could keep that waste out of landfill while squeezing the full value out of these materials to create better products – it’s a win on all fronts.”

The next step for the research is to evaluate the potential for mixing the PPE streams, develop practical implementation strategies and work towards field trials.

The team is keen to collaborate with the healthcare and construction industries to further develop the research.

‘A Sustainable Approach on the Utilisation of COVID-19 Plastic Based Isolation Gowns in Structural Concrete’, with RMIT co-authors Dr Rajeev Roychand, Dr Mohammad Saberian, Professor Kevin Zhang and Professor Sujeeva Setunge, is published in Case Studies in Construction Materials (DOI: 10.1016/j.cscm.2022.e01408).

‘Application of COVID-19 single-use shredded nitrile gloves in structural concrete: Case study from Australia’ was published in Science of the Total Environment (DOI: 10.1016/j.scitotenv.2021.151423).

‘Preliminary evaluation of the feasibility of using polypropylene fibres from COVID-19 single-use face masks to improve the mechanical properties of concrete’ was published in Journal of Cleaner Production (DOI: 10.1016/j.jclepro.2021.126460).

The authors acknowledge the generous support of Casafico Pty Ltd, the Lowitja Institute (Australia's national institute for Aboriginal and Torres Strait Islander health research), the RMIT X-Ray Facility and RMIT Microscopy and Microanalysis Facility.

The RMIT Indigenous Pre-Doctoral Research Fellowship scheme forms part of RMIT’s commitment to providing Indigenous researchers early career opportunities. Registrations for the 2023 intake are now open. 

Find out more 

Story: Gosia Kaszubska and Will Wright

24 August 2022

Share

24 August 2022

Share

  • Sustainability
  • Science and technology
  • Research
  • Engineering
  • Property & Construction
  • Environment
Engage

Related News

news-aroma-intensity-1220px.jpg

Confinement may affect how we smell and feel about food

New research from RMIT University found confined and isolating environments changed the way people smelled and responded emotionally to certain food aromas.

Thumbnail_RA_Awards_2024_MEDIA_WALL.jpg

Aged care digital health tool recognised again on national stage

Australia’s first electronic screening and risk prediction tool for deterioration in aged care residents has won another national prize for its positive impact on health and safety.

Dr Biplob Pramanik shows the difference between a concrete block coated with his team’s anti-fatberg invention (left) compared to a block without any coating after undergoing an experiment that mimicked a sewer environment under extreme conditions to speed up the fatberg formation process. The white coloured blobs on the uncoated block are a mixture of fat, oil and grease (FOG) that have been deposited on the block. Credit: Will Wright, RMIT University

Anti-fatberg invention could help unclog city sewers

Engineers from RMIT University have invented a protective coating for concrete pipes that could help drastically reduce the formation of fatbergs in sewers.

news-carpet-concrete-1220px.jpg

Carpet fibres stop concrete cracking

Engineers in Australia have found a way to make stronger and crack-resistant concrete with scrap carpet fibres, rolling out the red carpet for sustainability in the construction sector.

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