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수축저감제와 팽창재를 병용 치환한 콘크리트의 수축 특성
김광화 ( Guang Hua Jin ),문학룡 ( Xue Long Wen ),심영태 ( Young Tae Sim ),이병상 ( Byung Sang Lee ),정용희 ( Yong Hee Jung ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2004 한국건축시공학회 학술발표대회 논문집 Vol.4 No.1
This study is to investigate the engineering and shrinkage properties of concrete incorporating shrinkage reducing agent(SRA) and expansive additive(EA) in order to reduce shrinkage of concrete. According to results, as for the properties of fresh concrete, increase in SRA and EA content leads to reduce the fluidity but to increase the air content, and as for setting time, there is little difference. For strength properties, it decreased with an increase in SRA dosage and increased up to 5% of EA content. For the properties of drying shrinkage, it shows decline tendency with an increase in SRA and EA content respectively. It also reduces significantly with the combination of SRA-EA systems due to the combined effect of the admixture. In the scope of this paper, it is found that the use of SRA with 0.5% and EA with 5% has optimum effects on the various properties of concrete. And under the combination of SRA and EA, it can reduce drying shrinkage about 37%.
혼화재의 치환방법에 따른 콘크리트의 초기 강도발현 특성에 관한 연구
김광화(Jin Guang-Hua),김기정(Kim Ki-Jeong),황인성(Hwang Yin-Seong),이승훈(Lee Seung-Hoon),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study is investigate the strength development of concrete with the replacing method of admixture at the early age. As a result, the setting time is retarded in comparison with plain concrete in the case of replacement of admixture for cement. And in the case of replacement of admixture for cement and fine aggregate, the setting time of FA replacement is retarded, but that of BS replacement is shortened.
초음파 기법을 이용한 변압기내 부분방전 패턴분석에 관한 연구
이양진(Yang-Jin Lee),김재철(Jae-Chul Kim),조성민(Sung-Min Cho),김광화(Kwang-Hwa Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
This paper analyzes partial discharge pattern using Rogowski coil and acoustic emission sensor to power transformer. Therefore, the location of partial discharge and pattern is deduced as obtaining reliable data to establish core structure in transformer.