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건식 옹벽 블록의 시멘트 혼입량 감소를 위한 혼화제 개발
이원홍(Won-Hong Lee),오홍섭(Hong-Seob Oh),이승열(Seuong-Yeol Lee),강욱중(Wook-Jung Kang),정재홍(Jae-Hong Jung),장낙섭(Nag-Seop Jang) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.1
The admixture was developed to improve short and long age strength of concrete by replacing ferronickel slag, solid waste produced in the industrial ferronickel alloys smelting process, with fine aggregate. It was mixed into concrete and the estimated strength was evaluated through compressive strength and rebound hardness tests of retaining wall blocks. The fine aggregate replacement rate of ferronickel slag was fixed at 52%, and tests were conducted on concrete with 5 ~ 15% reduction in cement compared to fine aggregate depending on the amount of admixture mixed. In concrete using the developed admixture, the amount of cement mixed was reduced, but the compressive strength at 7 days actually increased. Therefore, it was evaluated as suitable for developing early strength. The developed retaining wall block was designed with a mix design that reduced cement by 10% by fixing the fine aggregate replacement rate of ferronickel slag at 52% and mixing the developed admixture. The compressive strength of the retaining wall block through the dry process was evaluated through the rebound hardness test method, and it was confirmed that the compressive strength performance of the product could be maintained even if the amount of cement was reduced.
서기영,이현우,문상필,강욱중 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-
본 연구에서는 정밀, 소형제동에 사용되는 브러시리스 DC모터의 정밀 운전시 문제가 되는 코킹 토크의 저감을 위하여 코킹 토크 형성에 관한 특정식을 유도하여 그 성질을 파악하고 특정식을 토대로 코킹 토크저감을 위한 설계법을 제안하였다. The Paper characteristics equation of cogging torque is induced to learn this characteristics and on the ground of this equation, the design method is proposed for reducing cogging torque which is the problem to precisely drive DC brushless motor used in precise control system.