목질계 바이오차 및 아민 혼입에 따른 시멘트 모르타르의 기계적 성능 및 CO2 고정 성능 평가에 대한 실험적 연구

초록

In this study, wood-derived biochar was produced through pyrolysis at 300 °C and 500 °C, with additional ZnCl2 activation to enhance porosity. The 500 °C-activated biochar (S5-ZC) exhibited the highest surface area (717.6 m2/g) and micropore area (616.6 m2/g), resulting in the greatest CO2 adsorption capacity of 35.34 m2/g. When incorporated into mortar, biochar replacement at 3 wt% of cement showed a compressive strength variation of approximately -3.2 to +11.1 % compared with the control, indicating no significant adverse effect on strength development. Although MDEA addition alone reduced strength by about 11.33 %, the combined use of ZnCl2-activated biochar and MDEA mitigated this reduction (-9.35 to -4.97 %) while enhancing CO2 adsorption through synergistic physical and chemical adsorption. Therefore, the combined application of ZnCl2-activated biochar and MDEA is considered the most effective condition for improving CO2 adsorption performance with acceptable strength loss.

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