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超遲延劑의 凝結時間差에 의해 區分打設된 매스 콘크리트의 水和熱 低減 效果에 관한 硏究
한천구(Han Cheon-Goo),오선교(Oh Seon-Kyo),윤치환(Yoon Chi-Han),황인성(Hwang Yin-Seong) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.7
This study is dealt with reduction of hydration heat of 4 layer division-placed mass concrete by the difference of setting time of super retarding agent. According to the results, peak temperature of plain concrete, which does not mix super retarding agent, show 63℃ in the middle of 3rd layer. In the division-placed mock up structure which is controled so that the difference of setting time is 0.5, 1.0, 1.5, 2.0day same interval and 1.5 day same interval with change of thickness, setting time is retarded a bit in order of 4 layer to 1 layer, but peak temperature shows 70℃ that is higher than plain concrete. But in mock up structure which is division-placed at the varied interval, peak temperature by hydration heat shows 50℃ that it is reduced by about 13℃, compared with plain concrete because after first peak hydration heat of 4th layer (plain concrete), hydration reaction progresses after the drop of hydration heat in order of 3rd, 2nd and 1st layer. Thus, it is effective for reduction of hydration heat that concrete is division-placed at the varied interval of setting time.
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.