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Choi, Yun-Wang,Oh, Sung-Rok,Choi, Byung-Keol Hindawi Publishing Corporation 2017 Advances In Materials Science And Engineering Vol.2017 No.1
<P>We fabricated crack self-healing capsules using cement powder for mixing into cement composites and evaluated the properties of the capsule manufacturing process in this study. The manufacture of the self-healing capsules is divided into core production processing of granulating cement in powder form and a coating process for creating a wall on the surfaces of the granulated cement particles. The produced capsules contain unhardened cement and can be mixed directly with the cement composite materials because they are protected from moisture by the wall material. Therefore, the untreated cement is present in the form of a capsule within the cement composite, and hydration can be induced by moisture penetrating the crack surface in the event of cracking. In the process of granulating the cement, it is important to obtain a suitable consistency through the kneading agent and to maintain the moisture barrier performance of the wall material. We can utilize the results of this study as a basis for advanced self-healing capsule technology for cement composites.</P>
Flowability and Strength Properties of High Flowing Self-Compacting Concrete Using for Tunnel Lining
Choi, Yun-Wang,Choi, Wook,Kim, Byoung-Kwon,Jung, Jea-Gwone Korea Concrete Institute 2008 International Journal of Concrete Structures and M Vol.2 No.2
So far, there has been no study of the concrete to strengthen in the lining of the tunnels, except for the study of the stability of subgrade and the tunnel construction technologies. In the existing concrete work for tunnel lining, lots of problems happen due to the partial compaction and the material segregation after casting concrete. Accordingly, the aim of this study is to improve economic efficiency and secure durability through the improvement of the construction performance and quality of the concrete for the tunnel lining among the civil structures. Therefore, the compactability and strength properties of the High Flowing Self-Compacting Lining Concrete (HSLC) are evaluated to develop the mixing proportion for design construction technology of HSLC that can overcome the inner cavity due to the reduced flowability and unfilled packing, which has been reported as the problem in the existing lining concrete. The result of the evaluation shows that the ternary mix meets the regulations better than the binary mix. Consequently, it has been judged applicable to the cement for tunnel lining.
Choi, Yun-Wang,Oh, Sung-Rok,Kim, Cheol-Gyu,Lee, Jae-Heun Hindawi Limited 2018 Advances In Materials Science And Engineering Vol.2018 No.1
<P>The purpose of this study was to investigate the base material of the biological panel as one of the researches for developing the biological panel using (micro)organisms. In order to select the base material for the biological panel, the applicability of the magnesia-potassium-phosphate-foamed mortar composites material using the superabsorbent polymer was evaluated through the evaluation of basic quality and characteristics. Experiments were conducted to evaluate the fluidity, compressive strength, pH, roughness (porosity distribution), and moisture retention (absorbency) of the magnesia-phosphate-foamed mortar composites according to the additional amount of the superabsorbent polymer. Experimental results showed that the addition of a suitable superabsorbent polymer can provide good results in terms of compressive strength, workability, and moisturizing properties (absorbency). As a result, it can be used as a basic quality study data of the biological panel design.</P>
Choi, Dukhyun,Lee, Keun Young,Jin, Mi-Jin,Ihn, Soo-Ghang,Yun, Sungyoung,Bulliard, Xavier,Choi, Woong,Lee, Sang Yoon,Kim, Sang-Woo,Choi, Jae-Young,Kim, Jong Min,Wang, Zhong Lin Royal Society of Chemistry 2011 ENERGY AND ENVIRONMENTAL SCIENCE Vol.4 No.11
<P>In this paper, we present a simple, low-cost and flexible hybrid cell that converts individually or simultaneously low-frequency mechanical energy and photon energy into electricity using piezoelectric zinc oxide (ZnO) in conjunction with organic solar cell design. Since the hybrid cell is designed by coupled piezoelectric and photoconductive properties of ZnO, this is a naturally hybrid architecture without crosstalk and an additional assembling process to create multi-type energy scavengers, thus differing from a simple integration of two different energy generators. It is demonstrated that the behavior of a piezoelectric output is controlled from alternating current (AC) type to direct current (DC)-like type by tailoring mechanical straining processes both in the dark and under light illumination. Based on such controllability of output modes, it is shown that the performance of the hybrid cell is synergistically enhanced by integrating the contribution made by a piezoelectric generator with a solar cell under a normal indoor level of illumination. Our approach clearly demonstrates the potential of the hybrid approach for scavenging multi-type energies whenever and wherever they are available. Furthermore, this work establishes the methodology to harvest solar energy and low-frequency mechanical energies such as body movements, making it possible to produce a promising multi-functional power generator that could be embedded in flexible architectures.</P> <P>Graphic Abstract</P><P>Naturally hybrid flexible energy generator that converts individually or simultaneously low-frequency mechanical energies and photon energy into electricity was developed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1ee02080c'> </P>
최연왕(Choi Yun Wang),정재권(Jung Jea Gwone),김경환(Kim Kyung Hwan),안태호(An Tae Ho) 대한토목학회 2009 대한토목학회논문집 A Vol.29 No.5A
본 연구에서는 콘크리트와 철근과의 부착강도에 영향을 미치는 요인 중 철근의 위치를 수평하부철근(Horizontal reinforcement at Bottom position, HB), 수평상부철근(Horizontal reinforcement at Top position, HT), 및 수직철근(Vertical reinforcement type, V)으로 변화시킨 시험체를 제작하여 3수준의 콘크리트 강도 변화(30, 50 및 70 ㎫)에 따른 고유동 자기충전 콘크리트(High flowing Self-compacting Concrete, HSCC) 및 일반콘크리트(Conventional Concrete, CC)와 이형철근의 부착 특성을 비교ㆍ분석 하였다. HSCC 및 CC의 상부근 철근계수를 평가하기 위하여 HB/HT 철근의 부착강도비를 측정한 결과 50 및 70 ㎫의 경우 HB/HT의 부착강도비는 1.3이하로 나타났으며, 30 ㎫의 경우 HSCC 및 CC에서 각각 1.2 및 2.1로 나타났다. 따라서 HSCC 30, 50 및 70 ㎫의 경우 콘크리트구조설계기준(2007) 정착길이 설계시 상부근 계수에 제시되는 수평상부철근에 대한 정착길이 보정계수를 CC의 1.3보다는 감소시켜 적용하는 것이 바람직할 것으로 판단된다. This study was intended to compare and evaluate the adhesion of High flowing Self-compacting Concrete (HSCC), Conventional Concrete (CC) and deformed bar based on concrete strength 3 (30, 50 and 70 ㎫), among the factors affecting the bond strength between concrete and rebar, after fabricating the specimen by modifying the rebar position at Horizontal reinforcement at bottom position (HB), horizontal reinforcement at top position (HT) and vertical reinforcement type (V). As a result of measuring bond strength of HB/HT rebar to evaluate the factor of the rebar at top position, the bond strength of HB/HT rebar at 50 and 70 ㎫ was 1.3 or less and at 30 ㎫, HSCC and CC appeared to be 1.2 and 2,1, respectively. Thus, when designing the anchorage length according to the concrete structure design standard (2007) at HSCC 30, 50 and 70 ㎫, it would be desirable to reduce the correction factor of anchorage length of the horizontal reinforcement at top position, which is suggested for the reinforcement at top position, to less than 1.3 of CC.
무기계 재료기반 자기치유 고상캡슐 활용 시멘트 모르타르의 투수 저감에 따른 균열 치유 효과에 관한 실험적 연구
최연왕 ( Choi Yun Wang ),오성록 ( Oh Sung Rok ),김철규 ( Kim Cheol Gyu ),남은준 ( Nam Eun Joon ),최욱 ( Choi Wook ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
In this paper, water flow test was performed to evaluate the healing performance of self - healing solid capsules based on inorganic materials. The water flow test was used to evaluate the permeability reduction for each healing age with respect to the initial permeability of crack - induced test specimens.