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매입형 히트파이프를 이용한 매스콘크리트 수화열 분산 효과
김명식(Myung-Sik Kim),염치선(Chi-Sun Youm),백동일(Dong-Il Baek) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.4
Although most of existing hydration heat control methods show a certain degree of hydration heat control, generally, there are many problems as mentioned above. Therefore, our laboratory previously developed a hydration heat control method using an exposed heat pipe, which solves most of these problems and simultaneously displays excellent hydration heat control. Unfortunately, even this method had some problems such as the processing, transport, and assembly of heat pipes, and the surface treatment of a cut plane after pouring, and hardening concrete. Therefore, in this study, a hydration heat control method using an embedded pipe has been developed with the expectation that this method solves those problems in hydration heat control using an exposed heat pipe. As a result of the experiment, the peak temperature of ECHP and ICHP specimen about 4.5~6.5℃ than the OPC specimen and the probability of thermal cracked generated in ECHP and ICHP specimen decreased up to 13~20%. Finally, it was confirmed in this study that the hydration heat control method using an embedded heat pipe is significantly more superior and cost effective than the existing method of an exposed one.
진동형 히트 파이프를 이용한 매스 콘크리트의 겨울철 수화열 제어 특성
양태진(Tae-Jin Yang),김정훈(Jeung-Hoon Kim),염치선(Chi-Sun Youm),김명식(Myung-Sik Kim),김종수(Jong-Soo Kim) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.2
In process of reinforced concrete (RC) box structure, the heat of hydration may cause serious thermal cracking. This paper reports results of hydration heat control in mass concrete using the oscillating heat pipe. There were three RC box molds (1.2m×1.8m×2.4m) which were different from each other. One was not equipped with pulsating heat pipe. The others were equipped with pulsating heat pipe. All of them were cooled with natural air convection. The pulsating heat pipe was composed of 10 turns of serpentine type copper pipe whose outer and inner diameters were 4 and 2.8 ㎜ respectively. The working fluid was R-22 and charging ratio was 40% by volume. The temperature of the concrete core was approximately 55 ℃ in the winter without pulsating heat pipe. For a concrete with pulsating heat pipe, however, the temperature difference with the outdoor one reduced up to 12℃. The index figure of crack was varied from 0.75 to 1.38.