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공장건축의 외벽 구조체공사에 Tilt-up공법 적용에 관한 연구
소광호(Sho, Kwang-Ho),안연수(An, Yeon-Soo),조창곤(Cho, Chang-Gon) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.2
The tilt-up method, which is mainly used in the United States and Canada, is widely used in low-rise structures such as factories, large marts, warehouses, and sales facilities. This cast-in-place concrete precast method is being expanded worldwide in terms of economical construction cost and shortening the construction period. Therefore, in this paper, for the activation of the tilt-up method in Korea, case studies abroad and those applied in Korea were investigated and presented. In order to improve the quality of the wall panel, the work was performed using an floor concrete laser screed machine in USA, and the wall panel was split into the same size as possible and applied to the field to increase productivity and work efficiency. In particular, in the right of comparing the tilt-up method with the traditional method, the tilt-up method can work horizontally in a process that works vertically, thereby ensuring safety of work, so it can reduce accidents caused by high-place work, and to enhance work efficiency. And it was analyzed that it could save the input manpower of the craftsman.
BSCCO(2212) 벌크 초전도체의 주조조건 및 SrSO<sub>4</sub> 최적함량에 대한 연구
김규태,박의철,장석헌,임준형,주진호,김찬중,김혜림,현옥배,Kim Kyu-Tae,Park Eui-Cheol,Jang Seok-Hern,Lim Jun-Hyung,Joo Jin-Ho,Kim Chan-Joong,Kim Hye-Rim,Hyun Ok-Bae 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.6
We fabricated BSCCO-2212 (2212) rod by the melt casting process (MCP) and evaluated the effect of the melt flowing on the critical current ($I_c$) by using vertical and tilt casting. It was observed that the $2212-SrSO_4$ rod processed by the tilt casting method with homogeneous pre-heating temperature of the mold had a higher $I_c$ than that processed by the vertical casting method. We also evaluated the influence of the strontium sulfates ($SrSO_4$) addition on the texture, microstructure, critical current and temperature, and mechanical hardness of the $2212-SrSO_4$ rods. It was observed that the addition of $SrSO_4$ improved the critical current ($I_c$) and mechanical hardness of the 2212. The $I_c$ of the 2212 increased as the $SrSO_4$ content increased and reached a peak value (260 A at 77 K) at an $SrSO_4$ content of 6 wt.%. In addition, the addition of $SrSO_4$ had a beneficial effect on the mechanical hardness of the 2212. We studied the possible cause of the variation in the $I_c$ with the melt flowing and the $SrSO_4$ content based on the XRD, EPMA analysis and the microstructural observation.
용융주조법으로 제조한 BSCCO-2212 초전도체의 공정변수 연구
김규태,장석헌,임준형,주진호,김찬중,홍계원,김혜림,현옥배,Kim, Kyu-Tne,Jang, Seok-Hern,Lim, Jun-Hyung,Joo, Jinho,Kim, Chan-Joong,Bong, Gye-Won,Kim, Rye-Lim,Hyun, Ok-Bae 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6
We fabricated BSCCO-2212 (2212) bulk superconductor by melt casting process, and evaluated the dependence of the critical properties on the temperature and cooling .ate of mold and the pouring methods of melt. It was observed that the critical current (Ic) of 2212 was significantly dependent on the pre-heating temperature of the mold. At the pre-heating temperature of $500^{\circ}C$ followed by air cooling condition, Ic of 48 A at 77 K was obtained which was higher than others processed at different temperatures. In addition, the Ic improved to 132 A when tilt casting method was applied. The improved Ic is probably due to the fact that the tilt casting reduced a turbulent flow of the melt during casting causing less porosity and more homogeneous microsructure. Critical temperature was measured to be 87-89 K after the first heat treatment and it improved to 90-91 K when subsequently heat treated at $650^{\circ}C$ in a nitrogen atmosphere. This improvement was considered to be due to an optimization of the oxygen content in the range of 8.16-8.2.