From Sewage to Skyscrapers: Indian Engineers Turn Human Waste into Super-Strong Concrete
Researchers at Manipal University Jaipur, led by civil engineer Raghuvesh Tiwari, have developed a way to make concrete significantly stronger by replacing part of its cement with biochar derived from treated human waste.
Sourced from a fecal-sludge treatment plant in Warangal, the sewage is dried and heated in a low-oxygen chamber, then ground into a fine, carbon-rich powder. Tests showed that replacing 10% of cement with this biochar boosted flexural strength by 42% and compressive strength by 21% after 91 days of curing, while a 5% mix also improved performance.
The innovation could simultaneously cut cement's heavy carbon footprint and give sewage waste a valuable second life, though researchers found higher replacement levels weakened the material.
#Biochar #SustainableConstruction #Concrete #IndianScience #GreenBuilding #CircularEconomy #Innovation #CivilEngineering #WasteToValue #ScienceNews
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