Indian scientists develop a new concrete using human waste to make it significantly stronger than conventional cement

Scientists have found that biochar made from treated human waste, or faecal sludge, can partially replace cement in concrete and improve its strength. A study published inScientific Reportsfound that replacing 10% of cement with faecal sludge-derived biochar increased compressive strength by 21% and flexural strength by 42% after 91 days. However, higher replacement levels, particularly 15%, reduced performance.