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내한제 및 단열거푸집을 활용한 한중콘크리트의 효율적 시공
한천구(Han Cheon-Goo),오선교(Oh Sun-Kyo),신동안(Sin Dong-An),김경민(Kim Kyoung-Min) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.3
This study is intended to investigate the efficiency of the cold weather concreting method using anti freezing agent and<br/> insulation forms through mock up test, and to demonstrate it by real structure test. According to the results, when anti<br/> freezing agent is added by 8%, freezing temperature drop, setting time is shortened and compressive strength increases in<br/> comparison with normal concrete. In mock up test, temperature history of concrete drops upto -4℃ and -3℃ before 24 hours<br/> in the case of euro form+normal concrete and euro form+anti freezing agent respectively. On the other hand, temperature of<br/> concrete keeps above zero in the case of insulation forms+anti freezing agent, so this case shows the best adiabatic effect. In<br/> real structure test, when measuring the temperature history, the lowest temperature of the wall shows 3℃ and 4℃ in the case<br/> of normal concrete+euro forms and normal concrete+insulation form respectively. But, in the case of insulation forms+anti<br/> freezing agent, it does 6℃, so this case is very excellent. That of slab shows the similar tendency to the wall.
초지연제의 응결시간차를 이용하여 수평분할 타설한 매스 콘크리트의 온도이력 특성
전충근,윤치환,신동안,오선교,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
In this paper, field application test of super retarding agent is discussed to reduce hydration heat of mass concrete considering setting time difference of super retarding agent by using horizontal placing layer in Megatrium building construction field at Yongsan in Seoul. Properties of fresh and hardened concrete and hydration heat are investigated, According to test results, both base concrete and flowing concrete meet the requirement of designed slump and air content, although some variances exist. As for compressive strength, it also satisfies the specified strength the consumer need in base concrete and hardened concrete. As for hydration heat, highest temperature of middle section in top placing layer is 65v at 28hours, and in bottom placing layer is 73℃ at 68hours.