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고온 수열 콘크리트의 피해 깊이에 따른 B3B 휨 강도 특성
권현우(Kwon, Hyun-Woo),김영민(Kin, Young-Min),이건철(Lee, Gun-Cheol),허영선(Heo, Young-Sun) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 고온 수열 콘크리트의 깊이에 따른 B3B 휨 강도 특성을 검토하기 위해 시험체를 0 ~ 40mm 까지 10 mm 단위로 절단한 시험체를 가열하여 진행하였다. 검토 결과 가열 온도가 증가할수록 깊이 별 강도는 점차 저하하는 경향을 보였으며, 300 ℃ 이후 골재와 시멘트 페이스트의 균열로 인한 강도 저하를 나타내었다. In this study, in order to review the strength characteristics of the B3B flextural according to the depth of the high-temperature hydrothermal concrete, the test specimen cut to 0 to 40mm in units of 10mm was heated. As a result of the review, as the heating temperature increased, the strength of each depth gradually decreased, and after 300°C, the strength decreased due to cracks in the aggregate and cement pastes.
오승진(Oh, Seung-Jin),김영민(Kin, Young-Min),이윤준(Lee, Yoon-Joon),조일식(Cho, Yil-Sik),천원기(Chun, Won-Gee) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
There have been many developed systems for harnessing the solar energy such as solar water heaters, solar thermal power systems, PV systems, daylighting and solar hydrogen systems. all of them are capable of reducing CO₂ emission. However, the efficiency of those systems which work without a solar tracker is lower. This paper is a step by step procedure for fabrication and a performance test of a solar tracking system. The system developed in this study consists of motion controllers, motor drives, step-motors, feedback devices and application. CdS sensors are introduced into the solar tracking system for playing a primary role in poor conditions for tracking due to a gear backlash and a strong wind. Mini-dish was used as a concentrator for collecting sun light. The solar position data, in terms of azimuth and elevation, sunrise and sunset times was compared with those of KASI(Korea Astronomy & Space Science Institute). The results presented in this article provide the high accuracy of the present system in solar tracking and indicate a potential for energy savings.