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전명훈,이세현,이성복,이도헌 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Recycling waste concrete is very important for environmental pollution prevention, overcome aggregates shortage and effective use of resource. The examples of using recycled aggregates such as ground backfill, road construction, concrete production. But, aggregate for structural concrete requires high degree of quality. We investigated the quality of domestic recycled aggregates in order to activate the use of recycled aggregates to seek the technologically, politically supplement factors to contribute to the effective use of recycled aggregates which has ever been a national problem, and which would solve the aggregates shortage.
전기 저항법 및 초음파 속도법을 이용한 콘크리트 압축강도 조기 판정을 위한 실험 연구
최신호,박정민,이도헌,김화중 경북대학교 산업기술연구소 1996 産業技術硏究誌 Vol.24 No.-
It is very difficult to test the concrete quality, because the concrete consists of various materials, such as cement, sand, gravel, water, and etc. Therefore, the concrete has difficulties to estimate quickly its quality, compared with the other materials, Accordingly, we can't reflect quality control result quickly, a fresh concrete has many serious problems (economical problem, structural problem, etc.) after being cast in place. Especially, it takes a long time to discover the problems so that it's difficult to consider a counterplan when we discover them. And it takes not only many cost to Solve those problems, but we can't also remove perfectly fundamental ones. Besides, it results in shortening a whole building life, nevertheless the damage is small and limited. Therefore, the earlier test system of concrete quality is needed for the solution of the problem. The purpose of this study is to develop the method of earlier concrete quality control and its system, which evaluate the concrete 28 days strength in concrete. And this study establishes the general equation for the prediction of 28 days strength from the results of the earlier test. Also the method adopted ultras-onic velocity and electric resistivity as specific characters. This study proposed the method, the general equation, and the system for earlier concrete strength evaluation so that we may achieve convenient and quick quality controls.
전명훈,강도우,김효진,이세현,이도헌 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
The purpose of this research is to obtain the data for quality control of recycled aggregates product and use by examine the correlations among physical properties of recycled aggregate made of crushed waste concrete. For this purpose, we tested the physical properties of 7 recycled coarse aggregates and 10 recycled fine aggregates according to Korea Standards. As a result, we proposed the correlation equations for physical properties of recycled aggregates. Although the correlations among physical properties of recycled fine aggregates and recycled coarse aggregates showed some quantitative differences, this research revealed their similar tendencies.
구조체 콘크리트용 순화골재의 이물질 함유량 시험방법 개발
이도헌(Lee, Do-Heun),전명훈(Jun, Myoung-Hoon),정재동(Jaung, Jae-Dong) 한국건설순환자원학회 2005 한국건설순환자원학회지 Vol.1 No.1
건설폐기물 발생량이 급증함에 따라, 폐콘크피트를 파쇄가공한 순환골재를 구조체 콘크리트용으로 사용할 필요성이 증대하고 있다. 그러나 순환골재에는 콘크리트의 물리적 특성에 악영향을 미치는 각종 이물질이 포함되어 있어, 사전에 이물질 함유량을 적절히 판단하기 위한 시험방법이 요구된다. 본 연구에서는 순환잔골재와 순환굵은골재에 포함되어 있는 각종 이물질 함유량을 육안관찰에 의하여 선별하기 위한 시험방법을 개발하였으며, 그 결과는 다음과 같다. 1. 현행 KS F 2576(재생골재의 이물질 함유량 시험방법)은 시험대상 순환골재의 종류, 용어의 정의, 시료량, 시험방법 등의 전반적인 개정이 필요하다. 2. 순환골재에 포함된 이물질은 시료의 입경이 1.2mm 이상이면 육안선별이 가능하며, 입경이 클수록 측정 소요시간이 크게 단축된다. 3. 육안선별 방법에 의한 이물질 함유량 시험을 위하여 순환잔골재는 입경 2.5~5mm의 시료 30g, 순환굵은골재는 입경 5mm 이상의 시료 1kg을 대상으로 하면 시험의 용이성 및 정밀도 확보가 가능하다. A recycled aggregate contains impurities that affect negative effects on physical properties of concrete. Therefore, a test method for examining impurities content in recycled aggregate is necessary before use of recycled aggregate. In this study, the test method by visual examination for separating impurities in recycled fine and coarse aggregates was developed. The results of the test are as follow: 1. The current KS F 2576 was necessary for comprehensive revision including types of tested recycled aggregate, definition of terminology, quantity of sample, and test method. 2. Visual examination is appropriate for larger than impurity panicle size of 1.2mm, and the larger panicle size the shorter time was required. 3. For the impurity content test by visual examination, the easiness and accuracy of the test can be obtained from the condition of sample weight of 30 grams with particle size of 2.5mm to 5mm for recycled fine aggregate and the condition of sample weight of 1 kilogram with panicle size of larger than 5mm for recycled coarse aggregate.