Bhagat & Pancharathi (2025) Performance, microstructure and carbon sequestration potential of agro biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More based cement mortars. Cement and Concrete Composites. https://doi.org/10.1016/j.cemconcomp.2024.105867

Reducing the carbon footprint of cement production is a critical goal, given its significant contribution to global CO2 emissions. A recent study published in Cement and Concrete Composites explores an innovative solution: combining agro-waste biochar and early-age CO2 curing in cement mortars.

The researchers examined three biochars—Bamboo Biochar (BBC), Peanut Husk Biochar (PHBC), and Rice Husk Biochar (RHBC)—at varying dosages (up to 5% by cement mass). They analyzed the materials’ effects on strength, hydration, and CO2 sequestration under water curing and CO2-rich environments. Optimal results were achieved with 1% BBC or PHBC and 2% RHBC, improving hydration and strength.

Early-age CO2 curing, conducted with flue gas concentrations (17% CO2) for 48 hours, showed a 23% increase in hydration and 19% higher CO2 uptake with RHBC. This method mimics industrial conditions, offering a practical approach to carbon capture and utilization in construction.

Biochar, produced from crop residues like rice and peanut husks, not only mitigates agricultural waste but also enhances cementitious materials. Its porous structure facilitates the formation of calcium carbonate and other hydration products, improving the material’s mechanical properties and carbon-sequestering potential.

By combining biochar with CO2 curing, this approach demonstrates significant potential for reducing cement’s environmental impact while enhancing its performance—paving the way for more sustainable construction practices.