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단위부재의 Mock-up Test를 통한 접합분리 시험체의 압축강도 평가
정광식(Jung Kwang-Sik),기전도(Ki Jun-Do),김광기(Kim Kwang-Ki),김정진(Kim Jeong-Jin),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.5
Existing non-destructive test for evaluation of concrete compressive strength may show deviation in results analysis due to deterioration of precision by strength calibration and dry or humid condition by age, so there needs be testing method to determine long term structural internal force by collecting specimen with no damage of structure and measuring compressive strength through destruction test. This research applied to mock-up member the compressive strength evaluation method using joint separation mold that can plan and produce specimen cured in the same composition environment as concrete structure by attaching arbitrary(joint separation) to the form before concrete piling, and as a result, the management specimen was contrary to the hydration temperature of the member or was affected by external atmospheric temperature, however the joint separation specimen connected to structure and managed in the same environment showed a temperature curve similar to the member and decrease in temperature difference. Additionally, from initial age, with the compressive strength of joint separation specimen most similar to core strength, stable compressive strength can be evaluated up to design criteria strength 100㎫, so the method is proposed as an evaluation technique that can confirm highly reliable concrete quality.
황병준(Hwang Byoung-Jun),정광식(Jung Kwang-Sik),김광기(Kim Kwang-Ki),박희곤(Park Hee-Gon),강태경(Kang Tae-Kyoung),정상진(Jung Sang-Jin) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
With environmental contamination and the exhaustion of natural resources due to the rapid industrialization, there are growing concerns over the preservation of the environment and resources and as a result research on recycling wastes such as wood waste is being actively carried out.<br/> Thus, in order to promote the effective use of wood waste and to examine the characteristics of cement boards that are made of wood waste from wood, an environment-friendly material, and can be used as insulating and fire-proofing materials, this study purposed to investigate the properties of mortar made of sawdust and cement, which is an inorganic material used as a binder, to determine the optimal proportion of congelation accelerator, and ultimately to provide basic materials on the physical properties of woody cement boards.<br/> According to the result of this study, the most economically efficient proportion of congelation accelerator CaCl₂ is 4%, and when the proportion of wood increases the specific gravity of cement boards goes down and physical properties such as heat conductivity are Improved.
글리콜에테르계 혼화제를 사용한 콘크리트의 기초물성과 내구성능에 관한 실험적 연구
임상준(Lim Sang-Jun),김광기(Kim Kwang-Ki),백민수(Paik Min-Su),송인명(Song In-Myung),정재동(Jaung Jae-Dong),정상진(Jung Sang-Jin) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.11
Focused on the material related aspect for enhancing the durability of concrete, the present study analyzed the effect of glycol ether admixture, which is a chemical admixture that can compact the structure of concrete by entraining air inside the concrete, on the basic physical properties and durability characteristic of the concrete. In analyzing the results of experiment, we examined the basic physical properties and durability characteristic of concrete according to addition rate based on OPC and selected the optimal addition rate. In addition, with the optimal addition rate, we added glycol ether admixture to concrete, which contained fly ash and fine blast furnace slag power used as binder and highperformance water reducing agent for reducing the unit quantity, and examined changes in the characteristics of the concrete. According to the result, the optimal addition rate of glycol ether admixture was3% of the unit quantity of cement, and the addition of binder and chemical admixture did not have a significant effect on unhardened concrete but reduced the air content. In addition, we found that the addition was effective for strength and resistance to carbonation and the change of length in hardened concrete, but improvement in resistance to freezing and thawing was relatively low because of the decrease of the air content.
투명접합분리 시험체를 활용한 고강도 콘크리트의 강도관리에 관한연구
기전도 ( Jun Do Ki ),정광식 ( Kwang Sik Jung ),김학영 ( Hak Young Kim ),김광기 ( Kwang Ki Kim ),이영도 ( Young Do Lee ),정상진 ( Sang Jin Jung ) 한국건축시공학회 2009 한국건축시공학회 학술발표대회 논문집 Vol.9 No.1
This paper aims to evaluate hydration and intensity property of different kind of members and intensity in order to evaluate compressive strength of structural concrete using Joint Separation Test Body(JSTB). In fact it is difficult to test and evaluate already have constructed member. In this case, common method used by construction engineer is that ; Schmidt rebound hammer test, Ultrasonic pulse test, Method of using test specimen previously cast. However, these method to control the structural intensity involve many problem and impossibility to adapt construction. So, this paper proposes advance an opinion which have proper to examine intensity. has also aims to examine its validity and the plan to make similar environment with structural concrete and joint separation test body in order to verify efficiency assessment and on-site application.
브레이크 패드의 스코칭 제조공정에 따른 초음파 기반 탄성물성 분석에 관한 연구
이동원(Dong-Won Lee),김현중(Hyun-Jung Kim),권성진(Seong-Jin Kwon),이봉현(Bong-Hyun Lee),최원준(Won-Jun Choi),정광기(Kwang-Ki Jung) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently the elastic properties on automotive brake pads have been investigated by using the precise ultrasonic propagation velocity. Besides, the vertical(out-of-plane) Young’s modulus and its deviation of friction materials have been disclosed as the main design factors for the reliable disc brake system. For the purpose, the near infrared scorching instead of the flame scorching manufacturing process of brake pads has been concerned in this paper. Through the elastic property analysis based on the ultrasonic wave, it has been proved that the proposed near infrared scorching manufacturing process is more effective and compatible for the uniform quality of brake pads than the flame scorching manufacturing process.