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Charred Coffee Grounds Boost Concrete Strength by 30%
16 Oct
Summary
- Charred coffee grounds can strengthen concrete by up to 30%
- World produces 10 billion kg of coffee waste annually, mostly in landfills
- Pyrolysis process converts coffee waste into biochar that bonds with cement
In a breakthrough discovery, Australian researchers have found that adding charred coffee grounds to concrete can boost its strength by up to 30%. This innovative solution addresses two pressing environmental challenges at once.
The world currently produces around 10 billion kilograms of coffee waste annually, with much of it ending up in landfills. This organic waste poses a significant environmental threat, as it emits greenhouse gases like methane and carbon dioxide that contribute to climate change.
Meanwhile, the construction industry's insatiable demand for concrete, a resource-intensive building material, is also taking a toll on the environment through sand mining and other extraction processes.
To tackle these dual problems, the RMIT University team developed a clever process. They heat coffee grounds to over 350°C, depriving them of oxygen in a process called pyrolysis. This breaks down the organic molecules, resulting in a porous, carbon-rich biochar that can be incorporated into the cement matrix, strengthening the final concrete product.
The researchers are now working to further test the long-term durability of this coffee-cement hybrid and explore using biochar from other organic waste sources. Their innovative approach could revolutionize the construction industry while also reducing the environmental impact of waste disposal.
