In a major development for sustainable infrastructure, the Pakenham Roads Upgrade project has become the first Victorian Big Build initiative to incorporate an innovative concrete mixture containing biochar made from spent coffee grounds.
This novel approach, developed by researchers at RMIT University, is being implemented along a 30-cubic-metre footpath on McGregor Road in Pakenham.
The project, led by Major Road Projects Victoria (MRPV) and contractor BildGroup, utilises concrete where a portion of the traditional river sand has been replaced with biochar derived from used coffee grounds.
This innovative solution addresses two significant environmental concerns: the reduction of organic waste in landfills and the conservation of sand resources.
Dr Rajeev Roychand, the lead inventor of coffee concrete at RMIT, expressed enthusiasm for the partnership with BildGroup and MRPV.
“This proactive support plays a significant role in creating a potential for diverting all forms of biodegradable organic waste, which is currently ending up in landfills and contributing to 3 per cent of Australia’s greenhouse gas emissions,” Roychand stated.
The scale of this innovation is impressive.
For this project alone, five tonnes of spent coffee grounds — equivalent to approximately 140,000 cups of coffee — were converted into two tonnes of usable biochar.
This not only diverts waste from landfills but also saves over three tonnes of sand.
MRPV Program Director Brendan Pauwels highlighted the potential of this technology, stating: “These numbers are remarkable in terms of ecological benefit, and we’re excited to see the Pakenham Roads Upgrade be the first Victorian Big Build project to use the coffee concrete.”
The coffee concrete initiative is part of a broader commitment to circular economy practices within the Pakenham Roads Upgrade.
Other sustainable measures include reusing in-fill soil for freeway embankments and incorporating foam bitumen and rubber tyre road barriers.
BildGroup CEO Stephen Hill, an RMIT alumnus, emphasised the business sense of this approach: “From a triple bottom line perspective, this just makes good business sense.”
This project builds on a successful world-first trial conducted earlier this year in Gisborne, Victoria, in collaboration with Macedon Ranges Shire Council.
The potential for scaling this technology is significant, considering that Australia generates 75 million kilograms of ground coffee waste annually, which could replace up to 655 million kilograms of sand in concrete production.
As the Pakenham Roads Upgrade progresses, it not only improves local infrastructure but also sets a new standard for sustainable construction practices in major infrastructure projects.
The success of this initiative could pave the way for wider adoption of coffee-infused concrete, contributing to a more environmentally friendly construction industry across Australia and beyond.