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경량기포콘크리트(ALC)의 혼화재 및 규석입도에 따른 성능개선
김영엽,송훈,이종규,추용식 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.8
Recently, the use of autoclaved lightweight concrete(ALC) has became increasingly popular. ALC is a unique building material. Because of its cellular nature, it is lightweight, self-insulating, sound and fireproof, as well as insect and mold resistant. Furthermore, ALC is free of VOCs and various fibers associated with wood and glass wool construction. However, ALC have high water absorption, low compressive strength and popout the origin of the low surface strength in its properties. These properties make troubles under construction such as cracking and popout. Thus, this study is to improve the fundamental strength by controls of increasing of admixtures, SO3 ratio's and silica powder size. Admixtures make use of metakaolin, silica fume, sodium silicate and sodium hydroxide. From the test result, the ALC using admixture have a good fundamental properties compared with plain ALC. Compressive strength, specific strength and abrasion's ratio were improved depending on increasing admixtures ratio's, SO3 ratio's and silica powder size.
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C12A7을 함유한 열연슬래그를 혼입한 레미콘 회수수 활용 및 시멘트 모르타르의 적용 특성
김영엽,이한승 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.1
CaO-based by-products composed of CaO, SO3, Al2O3, etc. are generally used as raw materials for CaO compounds. When applied to the recovered water of ready-mixed concrete, the hydration reaction of the powder material is accelerated and concrete performance can be improved. In this study, activated sludge was prepared to apply to the recovered water of ready-mixed concrete by mixing CaO-based hot-rolled slag(C12A7) in t he r ecycling w ater o f ready-m i xed c oncrete. C em ent paste setting time and mortar compressive strength performance tests confirmed the effect on the hydration reaction. Therefore, the possibility of concrete application using activated sludge was confirmed. CaO 화합물의 원료로는 일반적으로 CaO, SO3, Al2O3 등으로 구성된 CaO 기반인 산업부산물이 있다. 이러한 CaO 계산업부산물을 레미콘의 회수수에 적용할 경우 시멘트, 플라이애시, 슬래그미분말 등의 콘크리트 분말 원료의 수화 반응이가속화되어 콘크리트 성능을 향상시킬 수 있다. 본 연구에서는 레미콘의 회수수에 C12A7을 함유한 열연 슬래그를 혼입하여레미콘의 회수수에 적용할 수 있는 활성슬러지를 제조하였으며, 시멘트 페이스트 응결시간 및 모르타르 압축강도 성능테스트를 통해 수화반응에 대한 영향을 확인하고자 하였다.
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C<SUB>12</SUB>A<SUB>7</SUB>을 함유한 열연슬래그를 혼입한 레미콘 회수수 활용 및 시멘트 모르타르의 적용 특성
김영엽(Young-Yeop Kim),이한승(Han-Seung Lee) 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.1
CaO 화합물의 원료로는 일반적으로 CaO, SO₃, Al₂O₃ 등으로 구성된 CaO 기반인 산업부산물이 있다. 이러한 CaO 계 산업부산물을 레미콘의 회수수에 적용할 경우 시멘트, 플라이애시, 슬래그미분말 등의 콘크리트 분말 원료의 수화 반응이 가속화되어 콘크리트 성능을 향상시킬 수 있다. 본 연구에서는 레미콘의 회수수에 C12A7을 함유한 열연 슬래그를 혼입하여 레미콘의 회수수에 적용할 수 있는 활성슬러지를 제조하였으며, 시멘트 페이스트 응결시간 및 모르타르 압축강도 성능 테스트를 통해 수화반응에 대한 영향을 확인하고자 하였다. CaO-based by-products composed of CaO, SO₃, Al₂O₃, etc. are generally used as raw materials for CaO compounds. When applied to the recovered water of ready-mixed concrete, the hydration reaction of the powder material is accelerated and concrete performance can be improved. In this study, activated sludge was prepared to apply to the recovered water of ready-mixed concrete by mixing CaO-based hot-rolled slag(C12A7) in the recycling water of ready-mixed concrete. Cement paste setting time and mortar compressive strength performance tests confirmed the effect on the hydration reaction. Therefore, the possibility of concrete application using activated sludge was confirmed.
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공간의 국지적 탐색을 통한 공공도서관의 입지평가 및 최적입지 선정
김영엽(Kim, Young-Youb),여관현(Yeo, Kwan-Hyun) 한국주거환경학회 2014 주거환경(한국주거환경학회논문집) Vol.12 No.4
This study analyzes the spatial equity of provision of public libraries targeted on Seoul city as well as the locational efficiency and superiority. This study utilizes microscopic exploration techniques in order to compensate the defects left by preceding studies and to maximize the usability of the study results. According to results, public libraries in seoul covers 51.4% of the whole area and 70.4% of the overall population in the city in 2010. It is interesting that there is a deviation among sub-regions. They are 21 sub-regions including Gangnam, Gwanak and Songpa where relatively large number of the regions with location superiority are identified. This study explores microscopically spaces to help evaluate the spatial equity and efficiency of public libraries and as it provides timely proper study results. Conclusionally, this study is expected to provide some profound knowledge and information that can contribute to the policies concerning the provision of public libraries.
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