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고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가
김규용,이태규,민충식,이계혁,남정수,김영선,Kim, Gyu-Yong,Lee, Tae-Gyu,Min, Choong-Siek,Lee, Kye-Hyouk,Nam, Jeong-Soo,Kim, Young-Sun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on ${\O}100{\times}200mm$ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to $700^{\circ}C$, and the residual compressive strength compared to that observed at $20^{\circ}C$. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over $500^{\circ}C$.
고강도 매스콘크리트의 수화지연효과에 따른 수화발열상승속도 및 자기수축의 저감 특성 평가
김규용,구경모,신경수,이의배,강연우,타케우치 토루,Kim, Gyu-Yong,Koo, Kyung-Mo,Shin, Kyoung-Su,Lee, Eui-Bae,Kang, Yeon-Woo,Takeuchi, Tohru 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1
In this study, to reduce the hydration heat velocity of the high-strength mass concrete at early ages, micro encapsuled retarder that could retard cement reaction was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated. In the result of research, the retardation of the cement hydration process by the micro encapsuled retarder leads to an late setting, with no effect on the development of the compressive strength of concrete. The hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the use of the micro encapsuled retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.
고속 비상체의 충돌을 받은 섬유보강 모르타르의 내충격 성능 평가
김규용,남정수,미야우치 히로유키,Kim, Gyu-Yong,Nam, Jeong-Soo,Miyauchi, Hiroyuki 대한건축학회 2011 대한건축학회논문집 Vol.27 No.9
Recently, the damaged building and loss of life have been increasing by man-made disasters. In this study, the impact resistance performance of fiber reinforced concrete against high-velocity projectile was evaluated by using high pressure gas apparatus and AUTODYN. Plain mortar specimen was penetrated by steel projectile at 350 m/s and was fractured heavily at the backside. On the other hand, the PVA, PE and STF specimens reinforced with fiber have higher impact resistance than plain mortar, and were analyzed by Hughes equation. Finally, the impact resistance of specimens was calculated from viewpoint of fracture mode by AUTODYN and it was concluded that fiber reinforced concrete improve the impact resistance performance.
플라이애시 및 고로슬래그 첨가율에 따른 일반강도영역 콘크리트의 공학적 특성 및 내구성
김규용,신경수,임창혁,남정수,김무한,Kim, Gyu-Yong,Shin, Kyoung-Su,Lim, Chang-Hyuk,Nam, Jeong-Soo,Kim, Moo-Han 한국건설순환자원학회 2010 한국건설순환자원학회지 Vol.5 No.1
최근 $CO_2$ 배출의 저감을 위한 활동으로 시멘트의 사용량을 줄이고, 고로슬래그 및 플라이 애시 등과 같은 산업부산물을 적극 활용하여 건설분야에 적용하고자 하는 움직임이 활발하게 진행되고 있으며, 이를 통해 환경부하저감 및 자원재활용을 도모하고 있다. 이에 본 연구에서는 자원재이용 및 환경부하저감을 위한 기초적 연구로서 고로슬래그 및 플라이 애시를 사용하여 부산물의 치환율에 따른 경화성상 및 내구성상을 비교 분석하고 고로슬래그와 플라이애시의 3성분계를 치환한 콘크리트 성상을 검토함으로서 결합재로서의 상성관계를 평가하여 향후, 대량활용을 위한 기초자료를 제시하고자 하였다. 고로슬래그 미분말 및 플라이애시를 대체한 콘크리트의 압축강도는 재령 7일 초기강도에서는 무혼입 콘크리트에 비해 현저히 낮은 수준으로 발현하고 있으나, 28일 이후에는 무혼입 콘크리트에 비해 유사하거나 높은 압축강도를 발현하였다. 또한 고로슬래그 미분말의 대체율이 증가함에 따라 염해 저항성이 향상되는 것으로 나타났으며, 이는 기존 연구결과에 따라 고로슬래그 미분말에 의해 염화물 이온이 콘크리트 표면에 고정화됨으로서 염해 저항성이 향상되는 것으로 판단된다. Recently, reducing usage of cement and using by-product of industry such as blast furnace slag and fly-ash have been increased to reduce $CO_2$ gas emission. That apply to construction. As a result, reduction of environmental stress and recycling of resources are expected. In this study, as basic study to the reuse of resources and reduce Environmental Load, comparing and analyzing hardening characteristics and durability as using the blast furnace slag and fly-ash, examining concrete characteristics substituted the three elements for the blast furnace slag and fly-ash and evaluating the relationship as binder. Through this, it want to provide the basic data for mass utilization. Blast furnace slag powder and replaced at fly-ash compressive strength of concrete in the strength of the initial seven days material age lower level of expression significantly compared to the concrete, but, 28 days after the similar or higher compressive strength than the concrete expression of the was. In addition, the reserves replacement of blast furnace slag powder salt injury increasing resistance are seen improvements, according to the conventional blast furnace slag powder study by the chloride ions on the surface of the concrete are improved being fixation salt injury resistance is considered.