CARBON-NEGATIVE Concrete USING BIOCHAR: CarbonLock

Biochar is a carbon-rich material produced by the pyrolysis of biomass wastes such as rice husk, bamboo, coconut shell, sawdust, and agricultural residues under oxygen-limited conditions. Owing to its high porosity, large surface area, and stable carbon structure, biochar enhances concrete by acting as a micro-filler, internal curing agent, and carbon storage medium. It improves cement hydration, refines pore structure, increases compressive and flexural strength, and enhances durability against water penetration, chloride attack, and sulfate exposure. Most importantly, biochar permanently stores atmospheric carbon within concrete, making it a promising material for developing sustainable carbon-negative concrete and reducing the construction industry's carbon footprint.