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방화석고보드 두께 변화에 따른 고강도 콘크리트의 폭렬특성
손호정(Son Ho-Jung),배장춘(Pei Chang-Chun),이성연(Lee Seong-Yeun),한창평(Han Chang-Peng),양성환(Yang Seong-Hwan),한천구(Han Cheon-Goo) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The purpose of the study was to analyze fireproof characteristics followed by changes of thickness in fireproof gypsum board for spalling prevention when already-constructed high strength concrete structure was fired. The results of the study were as follows. In basic characteristics of concrete, both liquidity and air content satisfied the scope of the target. Compressive strength of 28 days in age expressed high-strength scope of more than 80㎫. In fireproof characteristics, regardless of thickness of fireproof gypsum board, serious destructive spalling took place after three-hour fireproof test. Therefore, the study could see that it didn’t satisfy regulations of the highest temperature and the average temperature prescribed by fireproof certification standard of Ministry of Land, Transport and Maritime Affairs.
고온가열상황 변화에 따른 고성능 콘크리트의 역학적 특성
이주선 ( Lee Ju Sun ),장기현 ( Jang Ki Hyun ),이보형 ( Lee Bo Hyeong ),한창평 ( Han Chang Peng ),양성환 ( Yang Seong Hwan ),한천구 ( Han Cheon Goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This research analyzed the Mechanical Properties of high Performance concrete by heating temperature, Elevated Temperature Duration and heating speed change through mix-in, and has shown the following results. Hardened concrete characteristics, age 28 days compression strength, 79.6 MPa, showed a high strength range close to 80 MPa level and age 28 days tension strength was 4.4 MPa. Also, The residual compression strengths by varied heating speed and heating temperature were 6.7℃/min 12hr., 13.4℃/min 2hr. and 6.7℃/min 2hr. at 20℃, and dramatically dropped at over 300℃. In summary, in case of concrete structure fire, structure safety drops dramatically and heat resistance deteriorates as heating delays, and therefore proper safety diagnosis evaluation and human protection and structure damage reduction measures will be necessary.