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양생온도 변화에 따른 플라이애시 치환 고강도 모르터의 자기수축 특성
손호정(Son Ho-Jung),김영희(Kim Young-Hee),馮海東(Feng Hai-Dong),허영선(Heo Young-Sun),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
This study investigates the effect of curing condition on autogeneous shrinkage of high strength mortar specimens incorporating fly ash (FA). Test results showed that increasing FA contents increased the workability of fresh concrete, but slightly decreased the compressive strength of hardened concrete at 28 days. In addition, increasing FA contents and curing temperature decreased the autogeneous shrinkage of the concretes.
손호정 ( Son Ho-jung ),이정아 ( Lee Joung-ah ),한창평 ( Han Chang-pyung ),이성연 ( Lee Seong-yeun ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This research analyzed the heat resistant characteristics of high strength concrete by varied thicknesses of CFT steel plate for 300×300×600 mm RC column member, and has shown the following results. As for the characteristics of unhardened concrete, the air amount and slump flow did not show any difference whether fiber is mixed, however both were shown to satisfy the target range. On the characteristics of hardened concrete, the compression strength by the ages, which is over 83.9 MPa, showed high strength range, and the case where NY+PP(0.05) fiber is mixed in showed a tendency to increase minutely compared to plane where fiber is not mixed in. As for heat resistant characteristics, the cases of 3.0 mm, 4.5 mm and 6.0 mm CFT thicknesses where fiber is not mixed in showed slight improvement of heat resistance as steel plate became thicker, but showed fracture phenomenon, and 6.0 mm thickness CFT where NY+PP(0.05) fiber is mixed in maintained the original look of test body, implying sound condition, which in turn signifies the importance of organic fiber mix-in in CFT structure as well. At this time, main bar highest temperature, 520.8℃, showed relatively good temperature history.
한중 시공시 단열보온양생방법 변화에 따른 슬래브 콘크리트의 온도이력특성
손호정(Son, Ho-Jung),백대현(Baek, Dae-Hyun),안상구(Ahn, Sang-Ku),고경택(Goh, Kyoung-Taek),한민철(Han, Min-Cheol) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
This study were analysis the affect of Internal temperature of concrete with -10℃ temperature condition in cold weather according to insulation curing method of concrete changes in curing methods, the result as follows. Internal temperature of concrete according to insulation curing method was in oder sawdust, double layer bubble sheet, exposure that in case of time reaches 0℃. However, if considering that constructability and management of construction site, double layer bubble sheet is desirable to apply the insulating curing method.