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고온수열 콘크리트의 세공구조 측정과 염화물이온 확산계수를 적용한 수명예측
오상균(Oh Sang-Gyun),고은혜(Ko Eun-Hye) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.3
The purposes of this study are measuring the Find Pore Structure in heated temperature Using Nitrogen Adsorption method and evaluating the Chloride ion migration coefficient of High-heated Concrete by NT BUILD 492 method. To evaluate performance of surface 5cm incoming Chloride Ion, 2D-numerical analysis model(FEM) was developed. As results of this study was obtained as follows; (1) Generally Pore Distribution Variation showed a tendency to increased affected by the influence of high water-cement ratios(W/C). On the whole porosity showed a tendency to decreased according as High-heated temperature irrespective of water-cement ratios(W/C). (2) The compressive strength and the modulus of elasticity were degraded depending on a rise of heated temperature. (3) The Chloride ion migration coefficient of High-heated Concrete were increased by heated temperature. In conclusion, the Chloride ion migration coefficient were affected by distribution of porosity and pore size.
오상균 ( Sang-gyun Oh ),김은기 ( Eun-ki Kim ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.2
본 연구에서는 CBD 기반의 RUP 모델을 이용하여 재 사용이 가능한 컴포넌트들을 설계하였으며, 이를 이용하여 연구관리 시스템을 구현하였다. 이를 위하여 연구관리 시스템의 주요 사용자 인터페이스인 등록관리 및 변경관리를 위한 컴포넌트를 구성하였으며, 구성된 컴포넌트들은 관련 SW개발에 효율적으로 재 사용될 수 있을 것으로 생각된다.
오상균(Oh Sang-Gyun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
As the number of concrete building structures in marine environment increases, Thus, concern of long-term durable is growing larger. it is important to study and predict the durability and the compound deterioration of the concrete itself which is appraised through the promotion chloride ion migration coefficient test by freezing-thawing damage. The concrete's resistance against freezing and thawing is tested based on KS F 2456, while its chloride ion migration coefficient is evaluated based on NT BUILD 492. In result of this study obtained as follows;, the more exposure to freezing and thawing process, the shorter compressive strength and service life it gets, due to the increased amount of chloride ion diffusion coefficient
초음파 속도법을 이용한 해안 콘크리트 구조물의 염해 저항성 평가
오상균(Oh Sang-Gyun),박동천(Park Dong-Cheon),이현재(Lee Hyun-Jae) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.10
Recently, the number of concrete structures is increasing rapidly in marine environment because it is necessary to efficiently use the limited spaces in the country. it is increasing the concern about durable performance of concrete structures in marine environment. particularly, structures in marine environment need to evaluate chloride resistance of concrete structures for durability but there is no regulation which estimates chloride resistance without destruction. Consequently in this study, Ultrasonic pulse velocity is suggested to estimate chloride resistance of concrete among non-destructive tests. As results of this study, It obtained a experimental formula from the relation between ultrasonic velocity and migration coefficient, In addition, It is possible to predict durability of concrete attacked salt damage through the method of ultrasonic velocity.
동결융해에 의한 매트릭스 붕괴와 콘크리트의 염해 저항성 평가
오상균(Oh Sang-Gyun),김정길(Kim Jung-Kil),황효재(Hwang Hyo-Jae) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.9
Recently, the number of concrete building structures in marine environment increases because many people prefer to the excellent landcape and the good view. By this, it is increased the damage as a chloride from the sea. Thus, concern of long-term durable is growing larger and many researches of chloride study are predicting the chloride. it is important to study and predict the durability and the compound deterioration along admixture addition and the high strength concrete itself which is appraised through the promotion chloride ion migration coefficient test by freezing-thawing damage. The concrete's resistance against freezing and thawing is tested based on KS F 2456, while its chloride ion migration coefficient is evaluated based on NT BUILD 492. In results of this study obtained as follows; (1) As high strength concrete is exposed to freezing and thawing process, the compressive strength and service life decreases, but the amount of chloride ion diffusion coefficient increases. (2) As concrete is exposed to freezing and thawing process, the compressive strength and the amount of chloride ion diffusion coefficien and service life does not change according to addition of admixture.
단면 수복재용 폴리머 시멘트 모르타르의 염화물 이온 침투 저항성 측정 및 염화물 이온 확산에 관한 해석
오상균(Oh Sang-Gyun),박재홍(Park Jea-Hong) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4
The chloride ion migration coefficient of polymer modified cement mortar (PCM) used as patching repair materials to the deteriorated RC structure was tested by NT BUILD 492 method. To evaluate performance of repaired section against incoming Chloride Ion, 2D-numerical analysis model (FEM) was developed. The diffusion coefficient of chloride ion decreased in proportion to the polymer cement ratio. It became clear through the analysis of FEM model that the performance change over time after repair depend on the removal range of retrograded concrete and the time of repair application. And on condition of ion-corrosion of RC structure exposed Chloride, we have constructed the forecasting model using FEM. We have forecasted concrete-removal around the iron and repair-time etc. through the diffusion phenomenon of ion constructed newly after Patching repair. And evaluated the performence and effectiveness by application.
혼화재료에 의한 재생시멘트의 레올로지 및 강도특성 개선
오상균 ( Sang Gyun Oh ),임승준 ( Seung Jun Im ),김정길 ( Jung Kil Kim ) 한국건축시공학회 2003 한국건축시공학회 학술발표대회 논문집 Vol.3 No.1
Recently, the study to reduce and recycle industrial waste is underway vigorously in the various fields of industry according to the conservation of environment and resources. In construction work, the disposal problem of its waste and environmental disruption have already been serious all over the world. However the recycle of waste concrete is still at an early stage, recycled aggregate from waste concrete have only used those as subsidiary road fillers. The research institute and the company make the study that it is about the properties of recycled aggregate and those structural capacity since 1990. Through the experimentation last year, we know that strength and fluidity of recycle cement are inferior to normal cement, and admixing aggregate powder deteriorates its strength. The purpose of this study is to search for appropriate heating time and to improve performance of the recycle cement while heating hardened cement which is crushed, we investigate separating aggregate from hardened cement by preheating and improvement of strength and fluidity in recycle cement which contains admixture.
활성탄을 이용한 시멘트계 친환경 건축재의 활용을 위한 실험적 연구
오상균(Oh Sang-Gyun),이진호(Lee Jin-Ho),안재철(Ahn Jae-Cheol) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.1
The buildings are usually constructed focusing on the convenience of erection and residential condition for the tenants. However, modern construction exhibits many problems, such as sick-building syndrome due to the pollution originated from the building materials. as people are spending more time inside the building. Therefore, the development of the building materials made of a natural matter is required instead of the materials generating a poisonous gas.<br/> Among the rest, there is carbon called 'Activated Carbon' to process charcoal, which is excellent in dryness, dampness, deodorization, and adsorption. Unfortunately, there have been scarce researches about activated carbon. The purpose of this study is to evaluate the effectiveness of an application method for Activated Carbon used for an environmental-friendly cementitious material.
오상균(Oh Sang-Gyun),김현정(Kim Hyun-Jeong) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.9
This paper presents properties of the surface finishing materials in marine environment. Concrete structures in marine environment are directly affected by the salt damages. Particularly, chloride penetration is decided by the diffusion coefficient and surface chloride amount but there is hardly any study about this. Therefore, this study estimated the surface chloride amount by the flying-salinity measuring model and reappeared the loss rate of the surface chloride by spraying a water. As a results of this study, absorption of granite and tile are lower than mortar, water repellent, water paint. A resistance property against the flying-salinity is changed by the sort of surface finishing materials and it differently affects concrete structures. In the future, if this data is used as boundary condition when predicting the durability of structures, it is expected to gain a reliable data.