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화재로 인해 성능저하된 콘크리트의 물성변화에 관한 실험적 연구
장재봉(Jang Jea Bong),송민섭(Song Min Seob),윤종기(Yoon Jong Kee),김용로(Kim Yong Ro),권영진(Kwon Young Jin),김무한(Kim Moo Han) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
In this study, normal and high strength concrete were made according to kinds of aggregate, admixture and water-binder ratio, and than exposed to a high temperature environment on the assumption that species were fired separately for 30 and 60 minutes with Standard Time-Temperature Curve. And fundamental data for the character change of concrete heated highly were presented by measuring characters of explosive spalling, ultrasonic pulse velocity and compressive strength before and after heating, after 1 and 3 months. It is intended to present data for the exact diagnosis, repair and reinforcement system of the deteriorated concrete heated highly.
화재로 인해 성능저하된 콘크리트의 물성변화에 관한 실험적 연구
장재봉 ( Jang Jea Bong ),송민섭 ( Song Min Seob ),윤종기 ( Yoon Jong-kee ),김용로 ( Kim Yong Ro ),권영진 ( Kwon Young Jin ),김무한 ( Kim Moo Han ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
In this study, normal and high strength concrete were made according to kinds of aggregate, admixture and water-binder ratio, and than exposed to a high temperature environment on the assumption that species were fired separately for 30 and 60 minutes with Standard Time-Temperature Curve. And fundamental data for the character change of concrete heated highly were presented by measuring characters of explosive spalling, ultrasonic pulse velocity and compressive strength before and after heating, after 1 and 3 months. It is intended to present data for the exact diagnosis, repair and reinforcement system of the deteriorated concrete heated highly.
국내 발전소별 바텀애시를 잔골재 대체재로 사용한 모르터의 특성에 대한 실험적 연구
송민섭,장재봉,조봉석,김재환,김용로,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
With the advance in industrial development and modern living comfort, the demand for electricity throughout the country is ever increasing. Also the annual consumption of coal by coal-fired power plants is increasing. The amount of ash produced in 2000 is estimated to be about 4.5 million tons. The disposal of this huge amount of ash introduces serious environmental problems. Fly ash among the ash produced is used in building industries as a substitute to cement in concrete and the concrete thus produced is said to be lighter and stronger. But bottom ash among the ash produced is not used because of its poor properties. But encouraging the use of bottom ash as a construction material is a sensible method of utilization as it avoids the problems and costs associated with disposal and provides an alternative aggregate source. This study is aimed at using bottom ash as an alternative fine aggregate source to provide a solution to disposal and insufficient fine aggregate for the production of concrete. So properties of bottom ash produced in power plants were estimated due to the difference of bottom ash produced in each plant. And mortar strength was estimated as basic data to use bottom ash in building industries.
권영진,김용로,장재봉,김무한 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1
본 연구는 잔골재 및 혼화재 종류, W/C에 따른 콘크리트의 폭열성상 및 압축강도 초음파속도 등의 공학적 특성을 검토함으로서 폭열 방지 및 화재 피해를 입은 콘크리트 구조물의 재사용과 보수보강, 안전도평가 등에 기초적인 자료를 제시하고자 한다. 폭열성상을 살펴보면, 잔골재에 따라서는 바다모래를 사용한 경우 폭열이 발생하지 않았거나 약간의 폭열이 나타나는 정도이나 재생잔골재나 부순모래를 사용한 경우에는 폭열이 심하게 나타났다. 또한 혼화재 종류에 따라서는 대체로 유사한 폭열성상을 나타내었다. 한편, W/C 30.5%의 고강도 영역에서는 대부분 폭열하였으나 W/C 55%의 보통강도 영역에서는 대부분 폭열하지 않았다. 잔존 압축강도는 W/C 55%의 경우 평균 45%로 나타났으며, W/C 30.5%의 경우에는 평균 6fl%로 나타났다. 초음파속도는 잔골재 종류 및 W/C, 가열시간에 따라 다르게 나타났으며, 가열후 3개월이 가열후 1개월보다 악 1.3-8.4%의 초음파속도 회복을 보였다. The purpose of this study is to present data for the reusing, rehabilitation and estimation of safety of RC structure damaged by fire, and for the prevention of explosive spalling by investigation the properties of explosive spalling, compressive strength and ultrasonic pulse velocity according to kinds of fine aggregate, admixture and water-cement ratios. In explosive spalling properties with kinds of aggregate. explosive spalling does not appear or little at surface in the case of used sea sand, but the case (of using recycled sand or crushed sand is worse and worse. Property with the kind of admixture does not appear specially. And high strength concrete with W/C 30.5% was taken spalling, but 55% does not appear. It is found that residual compressive strength after exposed at high temperature showed 45% in W/C 55%, and 64% in W/C 30.5% of its original strength averagely. Ultrasonic pulse velocity is different with kinds of aggregate, W/C, and heating time. When 3 month age after heating ultrasonic pulse velocity is recovered abut 1.3%-8.4% of its 1 month age after heating.
화재피해를 입은 콘크리트의 공학적 특성에 관한 실험적 연구
권영진,김무한,김용로,장재봉 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.1
A fife outbreak in a reinforcement concrete structure looses the organism by the different contraction and expansion of hardened cement pastes and aggregate, and cause" cracks by thermal stress, leading to the deterioration of the durability So concrete reinforcement structure is damaged partial or whole structure system Therefore accurate diagnosis of deterioration is needed based on mechanism of fire deterioration In general concrete structures Fundamental information and data on the properties of concrete exposed to high temperature are necessary for accurate diagnosis of deterioration In this study, normal and high strength concrete were exposed to a high temperature environment And than fundamental data for the character change of concrete heated highly were presented by measuring characters of explosive spalling, ultrasonic pulse velocity and compressive strength before and after heating It is intended to present data for the exact diagnosis and selection of rep31r and reinforcement system of the deteriorated concrete heated highly