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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.
고류동(高流動) 모르터를 이용(利用)한 구조체(構造體) 콘크리트의 재료분리결함(材料分離缺陷) 보수사례(補修事例)
윤기원 ( Yoon Gi Won ),강의영 ( Jiang Yi Rong ),오선교 ( Oh Seon Kyo ),한천구 ( Han Cheon Goo ),반호용 ( Bahn Ho Yong ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
Honeycomb in concrete structure caused by being lack of fine aggregate(sand-aggregate ratio), high dropping point of concrete when placing and unsuitable tampering have been often reported in construction field. It doesn't make the problems related to the internal forces of structure, whereas it may causes the deterioration of durability by neutralization, in this paper, the repair technique on the honeycomb in concrete structure by applying the grouting method of high fluidity mortar are discussed.