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골재종류에 따른 고강도 콘크리트의 잔존역학적 특성 평가
민충식(Min, Choong Sic),김규용(Kim, Gyu Yong),이태규(Lee, Tae Gyu),최경철(Choe, Gyeong Cheol),미야우치 히로유키(Miyauchi-Hiroyuki) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
Strength properties of Light weight concrete at target temperature is higher than normal weight concrete at target temperature in the overall. At 700℃, Strength properties of Light weight concrete is higher 30%. And residual elastic modulus ratio of normal weight Aggregate concrete on air cooling condition is 20% higher at 200℃ and 14% higher at 300℃ than water cooling condition. but, we considered that cooling condition has no effect on residual elasticity modulus ratio of lightweight concrete.
내화피복재를 도포한 고강도 콘크리트 부재의 온도이력 평가
민충식 ( Min Choong-sic ),김규용 ( Kim Gyu-yong ),미야우치히로유키 ( Miyauchi-hiroyuki ),이태규 ( Lee Tae-gyu ),이광준 ( Lee Gwang-jun ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this study, We calculate that optimum thickness of coating is 2.8~3.5mm measured results in preliminary experiments with small specimens. Which in the member of short collum by applying, compares with member of short collum mixed with fibers' results and evaluation of fire resistance. Thickness of coating 2.8mm member occurred spalling within lhour, Temperature history of 3.5mm member is 100°C lower than mixed with fibers. However, we found Spalling phenomena at corner of member, and suggest that prevent Spalling a minimum thickness of coating that offers more than 3.5mm.
고온 및 재하를 받은 일반 및 경량골재 콘크리트의 변형특성
이태규(Lee Tae-Gyu),김규용(Kim Gyu-Yong),미야우치 히로유키(Miyauchi Hiroyuki),민충식(Min Choong-Sic),최경철(Choe Gyeong-Cheol),박규연(Park Gyu-Yeon) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
It was very important to evaluate concrete experimentally at elevated temperature because concrete was filled with aggregate of concrete volume about 80 percent. In this study, it conducted a experiment to evaluate strain properties of normal weight and light weight concrete of 60㎫. Based on loading level of 0, 20 and 40 percent, test on thermal strain, total strain and transient creep to use Ø100×200㎜ cylinder specimen at elevated temperature. As a result, thermal strain of normal concrete was about 3 times larger than light weight concrete. And transient creep to develop as under loading was effected to change strain.
이태규(Lee Tae-Gyu),김규용(Kim Gyu-Yong),민충식(Min Choong-Sic),이계혁(Lee Kye-hyouk),김무한(Kim Moo-han) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
It was experimentally investigated in effects of high temperature regarding mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures ranging from 20 to 800℃ on thermal behavior of fiber mixed concrete according to W/C under loading. Tests were conducted on Ø100×200mm cylinder specimens. The specimens were tested under both stressed and unstressed conditions. The specimens were under-loaded to 0%, 33% of their ultimate compressive strength at room temperature.
박현길(Park Hyun-Gil),김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),민충식(Min Choong-Sic),남정수(Nam Jeong-Soo) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
It was vert important to evaluate concrete experimentally at elevated temperature because concrete was filled with aggregate of concrete volume about 80 percent. In this study, it conducted a experiment to evaluate mechanical properties of normal weight and light weight concrete of 60㎫ level at elevated temperature with various environment condition which are temperature and under loading. Based on loding level of 0, 20 and 40 percent, test on compressive strength, elastic modulus,at elevated temperature to use Ø100×200㎜ cylinder specimen.