@theargentgroup: Human waste is being turned into concrete that's 42% stronger. A team led by researchers at Manipal University Jaipur tested biochar made from fecal sludge as a replacement for some of the cement. The best overall performance came from replacing 5%. The material goes through a major transformation before it reaches the mixer. Sludge from a treatment plant in Warangal was dried and heated with little oxygen at 662 to 842°F (350 to 450°C). This process, called pyrolysis, produces a carbon-rich material known as biochar. It was then ground and sieved into a fine powder. Researchers used it to replace 5%, 10%, or 15% of the cement and tested the concrete's strength, water absorption, porosity, and shrinkage. One result drew particular attention: the 10% mixes gained an average of 42% in bending strength as they cured from 28 to 91 days. Their compressive strength, which measures resistance to crushing, increased by about 21% over that period. Those figures describe gains during curing, rather than a blanket improvement over ordinary concrete. The researchers propose several reasons the material helps. Biochar's tiny pores can store water and release it gradually, supporting the chemical reactions that harden cement. Its fine particles can fill gaps, while silica in the material can help form additional binding compounds. But adding more was not always better. At 15% replacement, researchers observed more pores, cracks, and weakly bonded regions. The 5% mixes generally performed best. The environmental appeal is straightforward: cement manufacturing releases large amounts of carbon dioxide, and human waste needs treatment and disposal. Reusing processed waste could reduce demand for cement. However, the study did not calculate the full carbon footprint. Long-term weathering and the possible release of heavy metals also need further investigation. More testing is needed before this material is ready for widespread construction use. Read the study: "Mechanical, durability, and microstructural performance of biochar-modified concrete using faecal sludge–derived biochar." Scientific Reports

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2026-10-13 21:35:42

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