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이산화탄소 고정 탄산화물을 적용한 콘크리트 2차 제품의 기초 특성 분석
유혜진,서성관,박금단,권혁준,김정환,Hye-Jin Yu,Sung-Kwan Seo,Kuem-Dan Park,Hyuk-Joon Kwon,Jeong-Hwan Kim 한국결정성장학회 2024 한국결정성장학회지 Vol.34 No.2
In this study, the applicability of CCMs (Carbondioxide conversion capture materials) manufactured by reacting carbon dioxide gas with DG (Desulfurization gypsum) as a cement substitute for secondary concrete products were evaluated and the basic physical properties of CCMs-mixed mortar and concrete specimens were measured to derive the optimal mixing ratio. The main chemical oxides of CCMs were CaO and SO<sub>3</sub>, and the main crystalline phases were CaSO<sub>4</sub>·2H<sub>2</sub>O, Ca(OH)<sub>2</sub>, CaCO<sub>3</sub>, and CaSO<sub>4</sub>. In addition, by the results of particle size analysis and heavy metal measurement, the applicability of CCMs as a cement substitute for secondary concrete products was confirmed. As a result of measuring the strength behavior using mortar and concrete specimens with CCMs, the compressive and flexural strength decreased as the mix ratio of CCMs increased, but requirements by the standards for interlocking blocks and retaining wall blocks, which are target products in this study, were satisfied up to the optimal mixing ratio of 10 wt.% substitution. Therefore, its applicability as a cement substitute for secondary concrete products was confirmed.