Researchers in Australia have uncovered a promising solution to two pressing environmental challenges: coffee waste and the impact of concrete production. A study published on January 1, 2025, reveals that incorporating charred coffee grounds into concrete can increase its strength by 30 percent.
Each year, the world produces approximately 10 billion kilograms of coffee waste, most of which ends up in landfills. This organic waste is a significant contributor to greenhouse gas emissions, including methane and carbon dioxide, which accelerate climate change. Meanwhile, the construction industry faces its own environmental challenges, particularly with the extraction of natural sand, which has harmful effects on ecosystems.
To address these issues, researchers at RMIT University developed a sustainable solution. They used a process called pyrolysis, in which coffee grounds are heated to over 350°C in an oxygen-deprived environment, turning them into biochar—a carbon-rich material that can bond with cement. This innovation not only strengthens concrete but also diverts organic waste from landfills.
The team tested different temperatures for pyrolysis and discovered that heating the coffee grounds to 500°C produced weaker biochar. Currently, they are evaluating the long-term durability of this coffee-enhanced concrete, testing its resilience under conditions such as freeze/thaw cycles and water absorption. The researchers are also exploring other organic waste sources, including wood and food scraps, for biochar production.
While this research is still in its early stages, it offers a promising step toward reducing landfill waste and conserving natural resources. The team advocates for a circular economy approach, which focuses on minimizing environmental impact and using sustainable materials. This work highlights how innovative uses for organic waste can provide valuable solutions for both waste management and the construction industry, contributing to overall environmental sustainability.
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