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프리믹스 시멘트를 사용한 고강도 콘크리트의 압축강도 특성
김성일 ( Jin¸ Cheng-ri ),최성용 ( Choi¸ Sung-yong ),이해일 ( Lee¸ Hai-ill ),황인성 ( Hwang¸ Yin-seong ),김성수 ( Kim¸ Sung-su ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
This study analysis the properties of the high-strength concrete using pre-mixed cement corresponding the change of W/B suggesting table for trial mix, and the results are summarized as following. The amount of AE and high-range water reducing agent decreased as W/B increased. The time of set was delayed as changing the ratio of W/B except 20% of W/B. The compressive strength decreased as W/B increased, but the flow did not influenced by W/B. The regression formula of 28th day compressive strength by B/W deciding suitable for W/B when plan the design of mix proportion is like this, σ<sub>28</sub> = 38.1 +11.620 × B/W(R = 0.9685)
열풍 건조 가공 공정이 다래 과실(품종명 만수)의 산화방지능에 미치는 영향
김성일(Cheng-Ri Jin),조치흥(Chi Heung Cho),남태규(Tae-Gyu Nam),조윤섭(Youn-Sup Cho),김대옥(Dae-Ok Kim) 한국식품과학회 2015 한국식품과학회지 Vol.47 No.4
다래 과실(품종명 만수)의 건조 절편을 제조하고자 열풍건조기를 이용하여 35, 50 및 70℃의 여러 온도에서 생과를 24시간 동안 열풍건조 하였다. 열풍건조 다래의 총 페놀 함량, 총 플라보노이드 함량과 산화방지능은 열처리하지 않은 생과(대조구)보다 감소하였다. ABTS 및 DPPH 라디칼 소거능에 기반하여 측정한 산화방지능과 총 페놀 함량 및 총 플라보노이드 함량과의 상관관계는 r²이 0.9 이상으로 높은 반면에, ORAC 법을 이용한 산화방지능은 상대적으로 낮은 상관관계를 나타내었다. 이러한 실험결과를 바탕으로 건조다래의 제조 시 온도 등 최적 가공 조건을 확립하여, 기능성이 우수한 건조다래를 개발할 필요가 있다. 또한, 고분자 함량이 많은 과피와 함께 과육의 섭취가 가능한 다래를 활용하여 주스, 젤리 등 다양한 제품을 개발할 필요도 있다. A hardy kiwifruit is a good source of phenolics and antioxidants. This study was aimed at investigating the effects of hot air drying at three different temperatures (35, 50, and 70℃) for 24 h on the total phenolic and flavonoid contents and the antioxidant capacity of hardy kiwifruits of Actinidia arguta × A. deliciosa cv. Mansoo. Dried kiwifruit extracts were produced using 80% (v/v) aqueous ethanol under homogenization. Hot air drying lowered the total phenolic and flavonoid contents and decreased the antioxidant capacity in the dried kiwifruits compared with their fresh counterparts. The results also revealed high positive linear correlations of antioxidant capacity with total phenolic and flavonoid contents, indicating that phenolics are the major contributors to antioxidant capacity. Our results suggested that an optimal drying process must be determined for industrial application in order to obtain dried kiwifruits with increased antioxidant capacity for consumers.
실리카퓸 종류변화에 따른 프리믹스시멘트 페이스트의 유동특성
황인성(Hwang Yin-Seong),金成日(Jin Cheng-Ri),최성용(Choi Sung-Yong),이해일(Lee Hai-Ill),김성수(Kim Sung-Su),한천구(Han Cheon-Goo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This study is to investigate the properties of the fluidity of the cement paste due to various and premixing silica fumes, and the results are summarized as following. The flow time of the paste using OPC is fastest among the various factors. It is delayed when FA was mixed comparing to BS. For the effect of the silica fume type, it is presented by order of A, B, and C. The flow of the paste is showed as the opposite tendency of the flow time of the paste, and it is displayed by order of B, A, and C. The viscosity of the paste is pwportional to the flow time of the paste. When FA is used, the orders are C, B, and A. For the BS, they are C, A, and B. All tests are showed for the straight tendency with the ring flow. The Correlation coefficient(R) are -0.847, 0.982, 0.981, and -0.882, so it was analyzed that they have close relationship.