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박희곤(Park Hee-Gon),김우재(Kim Woo-Jae),배연기(Bae Yeon-Ki),이한승(Lee Han-Seung),정상진(Jung Sang-Jin),이재삼(Lee Jae-Sam) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
As high rise buildings with 100 or more stories are being constructed, it is inevitable to use high performance materials including high performance concrete. What is most important in high performance concrete is extremely high strength in order to reduce the section of members in high rise buildings. During the last several years, there have been active researches on Ultra high strength concrete. While these researches have been mostly focused on strength development, however, other accompanying physical properties have not been studied sufficiently. Thus, the present study purposed to obtain and analyze data on the physical mechanical properties of Ultra high strength concrete through experiments and to use the results as basic information on required performance of concrete used in high rise buildings.
Cellulose Chip Fiber 첨가량에 따른 고강도 콘크리트의 Rheology 특성에 관한 실험적 연구
서일 ( Seo Ii ),이한승 ( Lee Han-seung ),김우재 ( Kim Woo-jae ),배연기 ( Bae Yeon-ki ),박희곤 ( Park Hee-gon ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
The High strength concrete is known for its excellent deformability, high resistance to resistance and use with applying vibration in congested reinforced concrete structure characterized by difficult casting conditions. The use of cellulose chip fiber has proved very effective in stabilizing the rheology of high strength concrete. The objective of this experimental study is to investigate the influence of rheological properties of cement paste of the high strength concrete according to contents of cellulose chip fiber. From the results, the fluidity, plastic viscosity, yield stress and rheology properties of high strength concrete were different according to contents of cellulose chip fiber.
파쇄한 ALC를 잔골재로 사용한 경량콘크리트의 특성에 대한 연구
이진우(Lee Jin-Woo),권해원(Kwon Hae-Won),박희곤(Park Hee-Gon),김유진(Kim Yoo-Jin),배연기(Bae Yeon-Ki),이재삼(Lee Jae-Sam) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
In these days, properties of concrete has been demanded to be high performance because concrete structure was bigger and higher. So studies on high strength concrete and lightweight concrete has been frequently done. But lightweight concrete has been used to limited non-structural elements in th country. Lightweight aggregate mixed with lightweight concrete was only coarse aggregate in case of the structural lightweight concrete. In the country studies on the lightweight concrete was poor and unvaried. Also it is difficult to be practical use of lightweight concrete was that it has been expensive. It was study on the using fine lightweight aggregate with lightweight concrete to crushed by-products and wastes to get to make ALe bricks and panel. So it was tested by fine aggregate standard and mixed with lightweight concrete.
잔골재 함수율에 따른 질량 및 부피변화에 관한 실험적 연구
박희곤(Park Hee-Gon),권해원(Kwon Hae-Won),이진우(Lee Jin-Woo),김우재(Kim Woo-Jae),배연기(Bae Yeon-Ki),이재삼(Lee Jae-Sam) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The crisis of aggregate supply has been serious for the last three years, and is recently even worsening with the stoppage of the import of sand from North Korea in May 2007. The problem in aggregate supply is spreading throughout the country, and in June 2007 ready mixed concrete companies in Chungcheongbuk do stopped their operation as they could not be supplied with aggregate. Due to the difficulty in aggregate supply, there can be problems in the quality and quantity of aggregate supplied to ready mixed concrete companies. Particularly in fine aggregate with a relatively high water absorption ratio compared to coarse aggregate, there can be the change of volume and weight according to the water content of aggregate. In addition, it is believed that, with the same volume, the weight may change according to the water content of fine aggregate depending on the distance of transportation. Particularly for washed sand used by most of ready mixed concrete companies in the capital area, the variation of its property, volume and weight is considered larger than that of river sand used in the past. However, previous researches on washed sand are mostly for the absolute dry state and surface dry state, and few researches have been made on changes in the volume and weight of aggregate according to water content. In this situation, it is very hard for each ready mixed concrete company to manage supplied aggregate. Thus, the present study purposed to examine the change of weight and volume of aggregate according to water content and the distance of transportation for fine aggregate supplied to the present company, to measure the variation of the weight and volume of fine aggregate supplied to ready mixed concrete companies according to water content, and ultimately to find the optimal water content of aggregate supplied and the optimal weight and volume for the water content.