실증 생산공정을 적용한 제강슬래그 콘크리트 블록의 성능 및 CO₂ 포집 특성 = Performance and CO₂ Capture Characteristics of Concrete Blocks Incorporating Steelmaking Slag Produced Using a Pilot-Scale Manufacturing Process

다국어 초록 (Multilingual Abstract)

As global efforts to reduce carbon emissions intensify in response to climate change, carbon capture, utilization, and storage (CCUS) has attracted attention as a potential mitigation strategy. This study investigates concrete blocks incorporating steelmaking slag as a partial replacement for fine aggregate, focusing on their structural performance, expansion stability, and carbon dioxide (CO2) capture characteristics under a pilot-scale production process. Based on preliminary laboratory experiments, mixture conditions satisfying the performance requirements for pedestrian concrete blocks were identified, and prototype blocks were manufactured using an actual production line. The results showed that specimens incorporating basic oxygen furnace slag (BOS) and electric arc furnace oxidizing slag (EOS) exhibited superior mechanical performance and expansion stability compared to the reference mixture, while specimens with electric arc furnace reducing slag (ERS) did not fully satisfy the required criteria. Thermogravimetric–differential thermal analysis (TG-DTA) and phenolphthalein tests further confirmed enhanced CO2 capture via mineral carbonation in the BOS- and EOS-containing specimens, with the CO2 capture potential of the EOS 35 mixture estimated at approximately 59 g per block. Overall, the results demonstrated that steelmaking slag–incorporated concrete blocks can maintain adequate structural performance under pilot-scale production conditions while providing additional CO2 capture functionality through mineral carbonation.