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건조수축 저감형 유동화제 및 2 중 버블시트를 사용한 콘크리트의 현장적용
한천구,오치현,신재경,Han, Cheon-Goo,Oh, Chi-Hyun,Shin, Jae-Kyung 한국건축시공학회 2007 한국건축시공학회지 Vol.7 No.1
This study investigates the filed application in Daebul Free Trade Zone applying both a flowing method using drying shrinkage-reducing superplasticizer(SRS) and an insulating curing method using double layer bubble sheet. Test results showed that fresh concrete satisfied target slump and air content. A structure adding SRS significantly decreased the total bleeding capacity and accelerated the setting time. As for the crack occurrence, the structure applying the flowing method and double bubble sheets simultaneously exhibited the most favorable crack endurance, while conventional concrete showed more than 1mm size of crack in overall. In addition, a structure applying the flowing concrete method partially presented the micro crack. For the area proportion of crack occurrence, the structure using the double bubble sheets indicated 9.8%, while others applying flowing concrete method was 28%, compared with that of conventional one. For the compressive strength of specimens, standard curing specimens indicated $3{\sim}33%$ higher value than that of specimens cured besides the field construction. The specimens containing SRS improved the strength of $2{\sim}6MPa$, which is $10{\sim}22%$ higher than that of conventional concrete.
건조수축 저감형 유동화제를 사용한 콘크리트의 Mock-up 실험
신재경(Shin Jae-Kyung),오치현(Oh Chi-Hyun),최진만(Choi Jin-Man),이성연(Lee Seong-Yeun),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
This paper reports the results of Mock-up test for concrete using drying shrinkage reducing superplasticizer(DSRS) in order to evaluate the validity of DSRS. The use of DSRS results in an noticeable improvement in compressive strength compared with other concrete. Drying shrinkage of concrete using DSRS is lower than of conventional concrete by as much as 17% due to less water content and contribution of expansive additives to expansion of specimens. Drying shrinkage measured by contact gauge has the highest value at the thin section of the mock up member such as near the window. The use of DSRS can reduce drying shrinkage by as much as 15~30% comapared with conventional concrete member.
조립질 화강암 연암지반 발파진동 추정식 산정에 관한 실험적 연구
송혁(Song Hyuk),오치현(Oh Chi-Hyun),박현구(Park Hyeon-Ku),고성석(Go Seong-Seok),김선우(Kim Sun-Woo) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
For ground vibration can cause the physical damage to existing buildings, it has always danger of huge accident. Because the characteristics of ground vibration is different by the field condition, it is difficult to prevent the accident due to the vibration. Nevertheless, it is necessary to establish the prevention plan to minimize the damage by generating the vibration below the limitation, From this point, the blasting job could be carried out through blasting pattern design and control.<br/> This study aims to propose the prediction equation of blasting appropriate for the constructive granite ground by measuring and analysing the blasting data of 954 times and the results can be applied for the blasting in the same ground type.
건조수축 저감형 유동화제를 사용한 콘크리트의 Mock-up실험
신재경 ( Shin Jae-kyung ),오치현 ( Oh Chi-hyun ),최진만 ( Choi Jin-man ),이성연 ( Lee Seong-yeun ),한민철 ( Han Min-cheol ),한천구 ( Hgn Cheon-goo ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
This paper reports the results of Mock-up test for concrete using drying shrinkage reducing superplasticizer(DSRS) in order to evaluate the validity of DSRS. The use of DSRS results in an noticeable improvement in compressive strength compared with other concrete. Drying shrinkage of concrete using DSRS is lower than that of conventional concrete by as much as 17% due to less water content and contribution of expansive additives to expansion of specimens. Drying shrinkage measured by contact gauge has the highest value at the thin section of the mock up member such as near the window. The use of DSRS can reduce drying shrinkage by as much as 15~30% comapared with conventional concrete member.
조립질 화강암지반의 발파진동 추정식 산정에 관한 실험적 연구
오치현,송혁,김선우 대한건축학회 2004 대한건축학회논문집 Vol.20 No.3
Ground vibration can cause physical damage to existing buildings and be the reason of huge accident. It is different the characteristics of ground vibration depending on field condition, which makes it difficult to prevent accident. Therefore, it is necessary to establish the prevention plan to minimize the damage by generating the vibration below the limitation. From this point of view, the blasting job could be carried out through blasting pattern design and control. This study aims to determine the prediction equation for blasting appropriate for the constructive granite ground by measuring and analysing the blasting data of 2,148 times and the results can be applied for the blasting in the same ground type. For blasting vibration prediction equation for a soft rock ground(single axis compression strength 235∼282 Kg/㎠), it was analysed that using the cube root conversion formula favored within 60m and using the square root conversion formula favored after 62m. for blasting vibration prediction equation for a normal rock ground(single axis compression strength 906∼1047 Kg/㎠), it was analysed that using the cube root conversion formula favored within 64m and using the square root conversion formula favored after 66m.