Biochar-Based Low-Carbon Construction Materials

Construction sector is one of the largest contributors of global carbon emissions. To achieve carbon neutrality, it is urgent to promote the low-carbon transformation of the construction sector. Biochar is a typical carbon-negative material that can be used as a supplementary cementitious material or aggregate to reduce the carbon footprint of construction materials and promote cement hydration through the internal curing effect and filler effect. Biochar with a porous structure can promote the diffusion of carbon dioxide (CO2) in concrete and improve carbonation efficiency. Moreover, the porous structure and high conductivity of biochar can make construction materials have special functions including thermal insulation, noise reduction and electromagnetic shielding. Therefore, recycling biochar into concrete is a promising approach to reduce the carbon footprint and enhance the performance of construction materials.

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