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신기훈 ( Ki Hoon Shin ),서진석 ( Jin Suk Suh ),박철우 ( Cheul Woo Park ),임남기 ( Nam Gi Lim ) 한국목재공학회 2014 목재공학 Vol.42 No.4
The analysis of shape before and after heating, Surface moisture content, Moisture weight change and surface heat distribution by fixed type microwave heating in forms of flat veneer and veneer roll of Korean pine, pitch pine, larch and yellow poplar was conducted. The results were as follows: In case of flat veneer, the quality after microwave heating was comparatively good, but it was somewhat warped. These phenomena may be due to transformation by nonuniform drying stress and stronger effect of local irradiation on the veneers when heating veneer owing to the characteristics of fixed type microwave equipment. In case of the features of roll-shaped veneer heated by microwave, the quality after heating was comprehensively excellent. Especially there was no warping unlike flat veneer. Heat distribution and diffusion were also very stable for roll-shaped veneer and such heat distribution had much influence on surface moisture content and moisture weight loss. Accordingly, the veneer roll would show sufficient drying efficiency in fixed type microwave equipment through a scrutinized examination on generating power and irradiation time according to species and thickness of veneer.
임상준(Lim Sang-Jun),김광기(Kim Kwang-Ki),박희곤(Park Hee-Gon),김우재(Kim Woo-Jae),임남기(Lim Nam-Gi),정상진(Jung Sang-Jin) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Waterproof agents used in ready mixed concrete for improving the watertightness of concrete structures are divided into powder type and liquid type, and they have been developed in Korea or imported from overseas. Waterproof agents reduce crack, shrinkage and swelling, and densify the tissue and enhance the strength through reducing pore space, but because their advertised performance is all the same despite differences in major ingredients, mixture ratio in concrete and the time of mixture, there are some doubts about the quality of concrete. Thus, in order to determine the generation of hydrate depending on the mixture of waterproof agent, the present study investigated chemical properties (ingredient analysis, tissue density, etc.) and examined the effects of the properties on the strength of mortar specimens.
FA 및 BFS를 혼입한 콘크리트의 염분침투성에 미치는 인장하중의 영향
박기철 ( Park Ki-cheul ),임남기 ( Lim Nam-gi ),김동훈 ( Kim Dong-hun ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
The effect of loading on chloride penetration into concrete is evaluated in this study. It is found that the chloride pene- tration rates for OPC concrete and blast furnace slag BFS concrete under the tensile stress were increased by 29% and 77%, respectively. The diffusion coefficient of FA and BFS concrete was lower than that of conventional concrete without BFS, no loads and stress states. Under tensile stress, the diffusion coefficient for FA and BFS, plain concrete showed higher values with increasing stress. The influence of specific surface area on the diffusion coefficient was investigated. As a result, the larger the specific surface areas of BFS are the lower diffusion coefficients. This tendency was more pronounced under the high stress conditions. The chloride penetration depth was distributed uni- formly when no stress was applied. However, in the case of tensile loading, the diffusion depth was not distributed uni- formly, and showed prominent characteristics. This result indicates that analysis using average values of chloride pene- tration depth is not proper under load conditions.
고강도 고유동 콘크리트를 이용한 콘크리트충전강관(CFT)구조의 충전성에 관한 공법 연구
강용학,정근호,임남기,이영도,정재영,정상진,Kang, Yong-Hak,Jung, Keun-Ho,Lim, Nam-Ki,Lee, Young-Do,Jung, Jae-Young,Jung, Sang-Jin 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.1
In this study, there are kind of property experiments like fluidity, compressive strength, bleeding measurement, concrete sink for CFT use high fluidity concrete. The property difference between before transmit and after transmit concrete in the mock up test with ready mixed concrete equipment is examined. The variable factors in mock up are diaphragm existence and nonexistence, diaphragm placing hole sizes. To investing the concrete Property under diaphragm, concrete packing ability, hydration heat, core specimen strength tests are performed.
재생골재 콘크리트의 현장적용을 위한 실험적 연구 - 전기충격식으로 수중파쇄된 재생골재를 중심으로 -
박희곤,정근호,임남기,이영도,정상진,정재영,Park, Hee-Gon,Jung, Keun-Ho,Lim, Nam-Ki,Lee, Young-Do,Jung, Sang-Jin,Jung, Jae-Young 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.1
The production accounts of domestic by-product is increased after 1990's. It is worried about the life reduction of dump land, as dump land's capacity have reached to limitation and the amount of construction industrial wastes is going higher. Recently, recycling aggregates could be gained from the reconstruction works using recycle process, and the study research of recycle concretes developed concrete application methods. It could put some outcome of studies to practical use for concrete products. The methods of crushing waste concrete are going diverse. In this study. the fundamental experiments and recycling application is investigated and analyzed with use of recycling aggregate which made of mechanical crush and underwater electrical impact crush, and the difference between underwater electrical impact crush, mechanical crush and natural aggregates is studied.
수밀성능 증진용 혼화제를 혼입한 콘크리트의 미세구조 변화가 압축강도 및 흡수특성에 미치는 영향에 관한 연구
김광기(Kim Kwang-Ki),권미옥(Kweun Mi-Ok),임남기(Lim Nam-Gi),정상진(Jung Sang-Jin) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.3
Among the factors of concrete deterioration, water infiltration accelerates early deterioration caused by the deterioration factors mentioned above. The watertightness of concrete is improved through the use of various binders and expansive admixtures as well as special types of cement designed for high durability. Recently, aiming at high waterproofness and durability, research is being made on waterproof admixtures that can be added before the placement of ready-mixed concrete and increase the waterproofness of the concrete and such waterproof admixtures emphasize the effect of high waterproof performance through improvement in the density of fire pore in concrete. However, because they are added to unhardened concrete, they may affect the physical properties of the concrete and there have been few researches on the characteristics of waterproof admixtures. In order to measure waterproofness in the use of waterproof admixtures, the present study examined resistanceto water infiltration through the addition of admixtures based on basic physical properties, and for this we conducted permeability tests using forced pressure according to the age of specimen and experiment on resistance to water absorption in the open air according to curing condition. According to the results of this study, waterproofness resulting from the addition of waterproof materials was determined by the initial age and it was found that the curing condition of specimens affects resistance to water infiltration. Also, in comparison with specimens without waterproof admixture, specimens containing waterproof admixture showed improvement in water resistance by around 30% in each condition.