Xiong, Zhang, et al (2024) Foam-stability enhancement in biochar-infused foam concrete: Analyzing ionic strength, interparticle distance, and water state. Journal of Cleaner Production. https://doi.org/10.1016/j.jclepro.2024.141231

Foam concrete is a versatile material with applications in construction projects, but lower-density variations face challenges like instability and low strength. This study explores using 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, derived from biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More waste, to address these issues.

Biochar, produced through biomass waste pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More, is gaining attention for its eco-friendly properties and ability to sequester carbon. When added to building materials like cement, biochar can absorb CO2, improving environmental impact. Its applications extend to enhancing permeability, acoustic properties, and adsorption of heavy metals in construction materials.

Lower-density foam concrete struggles with instability, low compressive strength, and susceptibility to shrinkage, limiting its applications.

The research investigates two types of biochar, corn husk biochar (CHBC) and rice husk biochar (RHBC), in foam concrete preparation. CHBC promotes flocculation formation, reducing interparticle distance, and increasing yield stress, enhancing foam stability. Conversely, RHBC reduces ion concentration, lowering yield stress, impacting foam concrete properties like pore structure, compressive strength, and stability.

Understanding the stabilization mechanisms of foam concrete with biochar is crucial for overcoming challenges associated with lower-density foam concrete. Biochar’s incorporation not only addresses stability issues but also contributes to the environmental sustainability of construction materials.

In conclusion, this study highlights the potential of biochar to enhance foam concrete stability, offering a promising avenue for the construction industry to create more stable and environmentally friendly materials.