Biochar made from spent coffee grounds can help produce a lower‑carbon concrete while supporting strength benefits and reducing pressure on natural sand supplies. There can be life‑cycle carbon dioxide reductions of 15 percent, 23 percent and 26 per cent at 5, 10 and 15 per cent biochar replacing sand, along with up to 31% lower use of fossil fuels and improvements in impacts on rivers and lakes.
www.rmit.edu.au/news/all-news/2025/nov/low-carbon-coffee-concrete