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고르슬래그미분말을 다량 혼입한 콘크리트의 염분침투저항성
박기철 ( Ki Cheol Park ),김동훈 ( Dong Hun Kim ),박신 ( Shin Park ),임남기 ( Nam Gi Lim ) 한국건축시공학회 2014 한국건축시공학회 학술발표대회 논문집 Vol.14 No.2
As a result of strength test on BFS concrete, those mixed with 30% and 50% of BFS8000, respectively, showed higher or equivalent strength compare to OPC. As a result of test of chloride penetration on BFS, diffusion coefficients of concrete mixed with 30% FA4000 and FA5000, respectively, showed to restrain average 6.5% of diffusion coefficient compared to OPC. And in case of BFS concrete, those mixed with BFS6000 and BFS8000, restrained diffusion of chloride ions 253% and 336%, respectively, compared to OPC. Therefore, Mixing 50% of BFS was most efficient in order to maximize restraint of chloride penetration according to metathesis of large amount. In this study, when mixing BFS to concrete for long-run durability and restraint against chloride penetration, for BFS, as fineness was higher and mixing it to concrete with less or equivalent 50% of replacement rate, there were results of higher strength compared to OPC and more efficient restraint of chloride ions.
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.
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.
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.
김광기 ( Kwang Ki Kim ),박선길 ( Sun Gil Park ),임남기 ( Nam Gi Lim ),정재영 ( Jae Young Jung ),송병창 ( Byung Chang Song ),정상진 ( Sang Jin Jung ) 한국건축시공학회 2002 한국건축시공학회 학술발표대회 논문집 Vol.2 No.1
The present age, it takes an interest in maintenance and preserve of the aged constructive materials cause destruction of environmental reason and a loss of resource. As answering question given to candidates at a civil examination, it is carbonated concrete construction materials to give alkalization agent to seek the plan to be extended durable life. The representative material, it was known for a chemical compound of alkailzation-Silica acid with Lithium and also used on inside and outside the country. But, it is so difficult to decide the effect because the work is to be repeated for a processing of construction. So, in this study, to investigate recovery faculty on a period of incubation that restrain processing of carbonation by impregnation alkalization agent, we were made good progress from basic test through comparative and analysis at laboratory and the spot of construction.
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.
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.
고강도콘크리트 벽체부재에 접합분리 시험체를 활용한 강도관리에 관한 연구
기전도 ( Jun Do Ki ),김학영 ( Hak Young Kim ),김광기 ( Kwang Ki Kim ),백민수 ( Min Su Paik ),임남기 ( Nam Gi Lim ),정상진 ( Sang Jin Jung ) 한국건축시공학회 2009 한국건축시공학회 학술발표대회 논문집 Vol.9 No.2
The existing techniques used to estimate and manage the compressive strength of concrete do not include the environmental factors that influence the development of compressive strength and the compressive strength itself. Thus, it is necessary to develop a reasonable yet simple way to measure the compressive strength of concrete structures at construction sites by considering concrete``s mechanical properties and curing environment. This study was conducted to propose an acrylic form and a junction isolation mold with crack-inducing boards that uses non-destructive methods to create and collect concrete test samples that are cured in the same condition as the actual concrete structures. junction isolation molds were used in high-strength and super high-strength concrete to evaluate the reliability of compressive strength evaluation on the test sample. The following were the findings of this study: