폐콘크리트 미분말을 탈탄산 원료로 사용하기 위한 골재와 시멘트페이스트 분리의 최적 마쇄 조건 분석 = Optimal Abrasion Conditions for Separating Aggregate and Cement paste for Using Waste Concrete Fine Powder as Decarbonization Raw Material

다국어 초록 (Multilingual Abstract)

In this study, we attempted to reduce CO2 generated during manufacturing by replacing limestone (CaCO3), a carbonate mineral used to produce cement clinker, with a decarbonated raw material to which CO2 is not bound. The raw material for decarbonization was cement paste attached to waste concrete, among various industrial by-products. Waste concrete has cement paste adhered to the aggregate, which cannot be separated efficiently by general crushing and grinding methods. Peeling and grinding methods effectively remove only the cement paste without damaging the original aggregate. The abrasion time, steel ball type, and steel ball ratio were selected as effective factors for Abrasion. An optimal abrasion experiment was conducted to produce waste concrete fine powder containing decarbonated CaO as a cement clinker raw material through an experimental design method. The experiment revealed that the optimal conditions for producing waste concrete fine powder were an abrasion time of 7 minutes, a steel ball size for pulverization of 8 mm, and a steel ball ratio for pulverization of 0.6.