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Saturday, November 29, 2025

Coffee Waste Could Make Concrete Stronger and Greener, Scientists Find

New research from RMIT University shows that spent coffee grounds can be transformed into biochar and used to replace a portion of sand in concrete, creating a stronger and more sustainable building material. Heating coffee waste at around 350°C without oxygen produces a fine biochar that boosts concrete’s 28-day strength by roughly 30% when used at 15% substitution. Life-cycle analysis shows the method can cut CO₂ emissions by up to 26%, supporting circular-economy construction and reducing reliance on natural sand.

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