The study, published in the concrete research journal “Concrete,” found that adding charred coffee grounds to concrete significantly improves its strength, durability, and sustainability. This innovative approach offers a sustainable solution to the construction industry’s growing need for high-performance concrete. The researchers’ findings are based on a series of laboratory experiments conducted on concrete samples.

“This practice, known as river sand mining, is a major contributor to habitat loss, erosion, and sedimentation.”

River sand mining, a significant source of sand for construction, has become a global phenomenon. The demand for sand in construction is driven by the rapid growth of the global population and urbanization. This demand has led to the unsustainable extraction of sand from riverbeds and banks, causing significant environmental damage.

The process of biochar production involves several steps. First, the organic matter is collected and pre-treated. This can include shredding, grinding, or other physical treatments to break down the material into smaller pieces.

“Our research is in the early stages, but these exciting findings offer an innovative way to greatly reduce the amount of organic waste that goes to landfill,” said RMIT engineer Shannon Kilmartin-Lynch. “Inspiration for my research, from an Indigenous perspective, involves Caring for Country, ensuring there’s a sustainable life cycle for all materials and avoiding things going into landfill to minimize the impact on the environment.” Their research was published in the Journal of Cleaner Production. An earlier version of this article was published in September 2023.