The Development of Biochar Concrete Contributing to Achieving a Carbon-Neutral Society

Abstract

The development of biochar concrete is a promising technology for achieving a carbon-neutral society by 2050. Concrete, widely used in construction, poses a challenge due to significant CO₂ emissions from cement production. To address this, biochar, derived from biomass through pyrolysis at temperatures above 350℃ under controlled oxygen conditions, is incorporated into concrete. This process converts carbon into a recalcitrant form and sequesters it within the concrete, thereby preventing its release back into the atmosphere. Biochar is used as a partial replacement for fine aggregates in concrete, maintaining similar properties to conventional concrete. Field applications in highway construction and building projects have demonstrated significant CO₂ emission reductions. Building projects have undergone third-party evaluations, confirming the carbon-negative potential achieved through the use of biochar concrete. While current applications focus on non-structural components, future development aims to expand its use to structural components.