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적외선 탐사기의 차감화상을 이용한 평가기법 향상에 관한 연구
강석표 ( Kang Suk Puo ),여동구 ( Yeo Dong Koo ),주지현 ( Joo Ji Hyun ),김재환 ( Kim Jae Hwan ),진영진 ( Kwon Young Jin ),김무한 ( Kim Moo Han ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
It is difficult to estimate for deterioration of exterior wall by infrared thermography, because of amount of infrared-ray radiation effected by environmental factors such as temperature properties of materials, the outside air and the amount of solar radiation. Therefore we measured the distribution of temperature by times in the same reinforced-concrete structure in order to reduce problems, occasioned by environmental factors, then we analyzed physical influence factors of the infrared thermography. It is the aim of this study to suggest basic data with regard to development of evaluation-system for deterioration of exterior wall in reinforced-concrete structures.
조성현 ( Chu Sung Hyun ),유제강 ( Yoo Jae Kang ),여동구 ( Yeo Dong Koo ),박선규 ( Park Sun Gyu ),권영진 ( Kwon Young-jin ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
The physical, chemical and thermodynamical deterioration mechanism in the concrete give rise to shrinkage or expansive strains in the cement paste or aggregates. These strains may lead to cracking of the concrete. In order to estimate the security of the fire-damaged concrete structure, it is necessary to analyze the deterioration mechanism and evaluate accurately deterioration appearance. This paper presents the most common deterioration mechanism in the concrete structure with fire damage and compares the performance deterioration of damaged the existent concrete structures by fire with theorical mechanisms.
플라이애시의 치환방법에 따른 콘크리트의 특성에 관한 실험적 연구
심재형,주지현,여동구,강석표,최세진,김무한 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2
Recently, the use of fly-ash as an admixture in concrete is now extremely common. But conventional mix proportioning methods even far ordinary portland cement concrete do not consider all of relevant to a particular application. The general focus is on achieving a given bevel of strength or durability characteristics in an economical manner. So, various modified replacement methods have been proposed. The purpose of this study was to present basic properties of concrete by replacement methods of fly-ash. The test results lead to the conclusion that the concrete with replacement method in fine aggregate (by volume) usually have higher compressive strengths and lower carbonation depths than the plain concrete and the concrete with replacement method in cement (by weight).
증점제를 사용한 고유동콘크리트의 기포조직과 내동해성에 관한 실험적 연구
김무한,권영진,강석표,여동구,김용로,장종호 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1
Recently, lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem. However, most studies have been concentrated on the manufacture method and properties of fresh concrete, but there is few studies for the durability of hardened concrete, specially for the freezing and thawing. It is generally known that the frost resistance of concrete is much affected by the air content in concrete and by the air void system. The frost resistance is also believed to vary with the strength of concrete. The purpose of this experimental study is to make a comparison between high flowing concrete using viscosity agent and ordinary concrete about the effect of the viscosity agent, air content and curing method on the frost resistance. As the result of tutus study, the frost resistance have not effect the viscosity agent but effect the different of curing methods.