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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.
극저온 조건에서 보온 양생방법이 벽체 콘크리트의 온도이력 및 강도발현에 미치는 영향
손호정(Son, Ho-Jung),한민철(Han, Min-Cheol) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.6
This study is to investigate the effect of heat curing method on the temperature history and early strength development of the concrete applied for a nuclear power plant structure exposed to severe environment, up to -20 ℃. Various types of insulating methods (namely conventional form, insulating form, heating mat and heating cable) were compared to find the optimum measure for developing the required strength in such harsh environment. Thermo-couples were implemented in 6 positions in the concrete specimens and one position outside. Test results showed that under exposure of -20 ℃, for the use of the conventional form, the average temperature inside of the concrete dramatically dropped to under - 15 ℃, whereas the application of other forms maintained the concrete temperature of over 0 ℃: the application of heating cable was the highest followed by that of heating mat and insulating form. For maturity development of these concretes, the control concrete with the conventional form could not achieved the required level, 64 °D·D, but other concretes achieved the required level within 3 days. Again, the application of heating cable in this analysis was the most effective. This study compared the experimental results with a logistic model and found that the results were slightly higher for the concretes exposed to -10℃ and similar for the concrete exposed to -20℃, compared to the results obtained from the model.