A systematic experimental study on biochar-cementitious composites: Towards carbon sequestration

The utilisation of biochar, the carbon negative product pyrolysis, reduces footprint cementitious composites as it possesses potential to replace consumption Portland cement. In a systematic investigation, biochar was used partial cement replacement for up 20 wt% in both pastes and mortars. A comprehensive experimental framework conducted evaluate impact on performance (i) paste terms hydration kinetics, rheology, strength development, porosity, (ii) mortars mechanical, thermal, transport properties. addition, durability developed mortars, including freezing thawing resistance, thermal acid (corrosion) flammability, smoke production, were examined. results revealed that lower rates with (up 5 wt%) do not substantially change composites. However, incorporating higher dosages (i.e., influenced process, reduced flexural compressive strengths by 49% 29%, respectively, increased water absorption coefficient 60% compared control specimens. same mortar demonstrated most promising freeze-thaw 98% relative residual strength), resistance well considerably conductivity. regardless content, did exhibit flammability. Therefore, this study despite specific technical issues, can be successfully incorporated into high dosage composite an alternative binder minimum environmental impacts improve insulating