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국내 골재 품질 현황 및 골재등급에 따른 콘크리트의 역학적 특성에 관한 연구
민충식 ( Choong Siek Min ),박종호 ( Jong Ho Park ),정용 ( Yong Jeong ),이재현 ( Jae Hyun Lee ),김용로 ( Yong Ro Kim ),김효락 ( Hyo Rak Kim ) 한국건축시공학회 2012 한국건축시공학회 학술발표대회 논문집 Vol.12 No.2
This study is aimed to utilize for basic material of concrete quality management through evaluate properties of fresh and hardened concrete with the aggregate quality. As a result, fine aggregate`s slump change of between one grade was 8~82% and in case of coarse aggregate, slump change of between one grade was 2~22% on same mixing condition. The unit water for same workability condition, unit water was increased 16kg/m3 with decreasing of one grade for fine aggregate and unit water was increased 5kg/m3 with decreasing of one grade for coarse aggregate.
강도 및 부재 치수에 따른 섬유혼입 콘크리트 기둥부재의 온도 이력 평가
민충식 ( Choong Siek Min ),김규용 ( Gyu Yong Kim ),이태규 ( Tae Gyu Lee ),구경모 ( Kyung Mo Goo ),전영석 ( Young Seok Jun ),김무한 ( Moo Han Kim ) 한국건축시공학회 2010 한국건축시공학회 학술발표대회 논문집 Vol.10 No.2
In this study, we evaluated the internal temperature history by ISO-834 Standard Heating Curve on unloaded condition to evaluate effect on temperature history of concrete column according to difference of water-cement ratio and concrete column size. The difference between the internal temperature history on the compressive strength is about 1-4% and big tendency was not observed. □300mm×300mm specimen``s average temperature 13.9%, maximum temperature 13.6% are higher than □ 400mm×400mm because of difference of thermal capacity due to difference of specimens``s size and the result of average temperature was above the national regulations. Thus, the scope of this study, we suggest as a range that 50mm more than the thickness of the coating and size of column □400mm×400mm is optimum fire safety design as a range.
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 $500^{\circ}C$.