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박리제에 의한 철근과 콘크리트 부재의 부착특성에 관한 실험적 연구
김백중(Kim Baek-Joong),진일권(Jin Il-Guan),최희복(Choi Hee-Bok),강경인(Kang Kyung-In) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.12
In construction site, reinforcing bars were usually coated by using form oils in form work. Nevertheless it becomes one cause of change on bond characteristics between reinforcing bar and concrete, any workers in most construction sites does not show interest to this problem. So, this study investigates the effect of form oils on bond characteristics of reinforced Concrete Members. We carry out experiments as componential analysis of form oils, exfoliation experiments, and Pull-out test. Results of these experiments are as following. 1) The order of surface glossing is as follows; an oil based form-oil > water based form-oil > no use form-oil. 2) According to coating rate increase, slip is increased. Increase rate of slip is as follows; oil based form-oil > water based form-oil. 3) According to increase of compressive strength, bond strength of specimen used no coating reinforcing bar is increased. But bond strengths of specimen used oil-based form-oil and water based form-oil has various behaviors. 4) When compare with specimen used no coating reinforcing bar, bond strengths of specimen used water based form-oil is decreased 14.7-41.1%, bond strengths of specimen used oil based form-oil is decreased 37.2-50.5%.
고로슬래그가 다량 혼입된 고강도 콘크리트의 수축 특성 및 균열 잠재성 평가
김백중(Kim, Baek-Joong),박충훈(Park, Chung-Hoon),이종구(Yi, Chongku) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.6
The purpose of this study was to evaluate shrinkage properties and potential for shrinkage cracking of high-strength concrete containing high volume blast furnace slag (BFS). The W/B 0.34 and W/B 0.28 concrete specimens, with BFS replacement ratio for cement at 0%, 45% and 65%, were prepared to examine their autogenous shrinkage, unrestrained drying shrinkage and restrained drying shrinkage characteristics. The test results showed that the increase of BFS replacement ratio led to not only the increase of autogenous shrinkage and drying shrinkage at early curing age, but also increase of restrained stress in concrete. However, at BFS replacement ratio more than 45%, no significant effect of BFS was observed on autogenous shrinkage and drying shrinkage after 14 days. Furthermore, potential for shrinkage cracking of high strength concrete containing high-volume BFS was found to be the “low” according to ASTM C 1581/C 1581M-09a.