http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김호림(Jin Hu-Lin),한민철(Han Min Cheol),고경택(Koh Kyoung-Taek),김도겸(Kim Do Gyum),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper reported the results of the fundamental properties and the effect of steel bar constraint using control mixture high performance concrete and mixture adjusted high performance concrete (HPC) For fresh concrete properties, both mixture met the target slump flow and air contents. Segregation reducing ratio exhibited more than 90%. Setting tune of HPC shortened by 6 hours compared with control concrete mixture HPC had higher compressive strength than control mixture concrete For HPC, stram with free shrinkage and constraint strain With reinforcing bar with Dl9mm and D25mm exhibited less than control mixture concrete by as much as 66%, 68% and 70%, respectively. Autogenous shrinkage stress had larger values With increase in contact area between bars and concrete. Autogenous shrinkage stress of HPC specimens constrained with reinforcing bars with diameter of Dl9mm and D25mm was reduced to 68% and 70%. respectively compared with control mixture concrete.
제주도 지하수 질산염 농도의 시·공간적 변화 특성: 장기(1993-2015) 모니터링 자료의 평가
김호림(Ho-Rim Kim),오준섭(Junseop Oh),도현권(Hyun-Kwon Do),이경진(Kyung-Jin Lee),현익현(Ik-Hyun Hyun),오상실(Sang-Sil Oh),감상규(Sang-Kyu Kam),윤성택(Seong-Taek Yun) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1
1993년부터 2015년까지 관측된 제주도 지하수 장기모니터링 관측정(N = 4,835)에서 수집된 지하수 수질자료(N = 21,568)를 기반으로 질산성질소의 시공간적 변동 특성을 평가하였다. 제주도 지하수의 질산성질소 농도의 중앙값은 2.5 mg/L로서 다른 국가나 대륙의 조사 결과에 비해 다소 높거나 유사한 것으로 나타났다. 또한 지하수 용도, 행정구역 및 고도 별로 유의한 차이를 보였다. 특히, 산간 지역에 비해 저지대 해안가에 위치한 농업 및 주거지역에서 농도가 높음을 확인하였다. Mann-Kendall 및 Sen’s slope 분석을 활용한 질산성질소 농도의 추세 분석 결과, 하류 저지 대에 비해 중산간지역에서의 질산성질소 농도 증가 경향이 뚜렷하였다. 제주도 내 토지 피복의 시계열 변화 특성과 결부 지어 보면, 중산간지역의 오염 증가 추세는 농업지역의 확장 등 인위적 활동 증가에 기인한 결과로 판단된다. 반면,기지정된 지하수자원특별관리구역에서는 전반적으로 질산성질소 농도의 감소 경향이 나타났는데, 이는 지하수 관리 측면에서 수질관리를 위한 적극적인 정책이 유효함을 시사한다. 본 연구에서는 제주도 지하수의 질산성질소 오염관리를 위한 적정 방안을 제안한다. The spatio-temporal variations of nitrate concentrations in groundwater of Jeju Island were evaluated by an analysis of time series groundwater quality data (N = 21,568) that were collected from regional groundwater monitoring (number of wells = 4,835) for up to 20 years between 1993 and 2015. The median concentration of NO 3 -N is 2.5 mg/L, which is slightly higher than those reported from regional surveys in other countries. Nitrate concentrations of groundwater in wells tend to significantly vary according to different water usage (of the well), administrative districts, and topographic elevations: nitrate level is higher in low-lying agricultural and residential areas than those in high mountainous areas. The Mann-Kendall trend test and Sen’s slope analysis show that nitrate concentration in mid-mountainous areas tends to increase, possibly due to the expansion of agricultural areas toward highland. On the other hand, nitrate concentrations in the Specially Designated Groundwater Quality Protection Zones show the temporally decreasing trend, which implies the efficiency of groundwater management actions in Jeju. Proper measures for sustainable groundwater quality management are suggested in this study.
팽창재 혼입률 변화에 따른 고성능 콘크리트의 수축저감에 관한 연구
김호림(Jin Hu-Lin),문학룡(Wen Xue-Long),고경택(Koh Kyoung-Taek),김성욱(Kim Sung-Wook),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study discusses the use of expansive additive as the method to reduce autogenous and drying shrinkage. According to results, as for the fundamental properties of high performance concrete, when shrinkage reduction agent is not used, fluidity and strength do not make a difference with the adding ratio of expansive additive. On the other hand, when shrinkage reduction agent is added by 1%, fluidity decreases, and air content increases with an increase of the adding ratio of expansive additive. Compressive strength is highest at the adding ratio of expansive additive of 5%. Autogenous and drying shrinkage are reduced with an increase of the adding ratio of expansive additive, and are reduced more largely in the case of combination with shrinkage reduction agent. Therefore, as expansive additive of 5% and shrinkage reduction agent of 1% are added to high performance concrete of W/B 30%, it is considered that fluidity and strength are hardly influenced, and in addition, crack by shrinkage can be prevented effectively.
金虎林 ( Jin Hu-lin ),한민철 ( Han Min Cheol ),고경택 ( Koh Kyoung-taek ),김도겸 ( Kim Do Gyum ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This paper reported the results of the fundamental properties and the effect of steel bar constraint using control mixture high performance concrete and mixture adjusted high performance concrete (HPC). For fresh concrete properties, both mixture met the target slump flow and air contents. Segregation reducing ratio exhibited more than 90%. Setting time of HPC shortened by 6 hours compared with control concrete mixture. HPC had higher compressive strength than control mixture concrete. For HPC, strain with free shrinkage and constraint strain with reinforcing bar with D19mm and D25mm exhibited less than control mixture concrete by as much as 66%, 68% and 70%, respectively. Autogenous shrinkage stress had larger values with increase in contact area between bars and concrete. Autogenous shrinkage stress of HPC specimens constrained with reinforcing bars with diameter of D19mm and D25mm was reduced to 68% and 70%, respectively compared with control mixture concrete.
골재 및 결합재 종류 변화에 따른 고강도 콘크리트 모의부재의 폭렬특성
장기현 ( Jang Ki-hyun ),김호림 ( Jin Hu-rin ),김상식 ( Kim Sang-shik ),양성환 ( Yang Seong-hwan ),김성수 ( Kim Seoung-soo ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
This study investigates the spalling properties of the mock-up specimens composed of the high strength concrete corresponding to the aggregate and admixture types in the case that 0.05vol% of the hybrid organic fibers composed of the NY+PP fibers. The fluidity corresponding to the aggregate and admixture types of the OBS is most favorable, and all factors are also satisfied with the target value of the slump flow and air content. The compressive strength of the all specimens is about 80MPa at 28 days, For the spalling occurrence after the fire test, it is most appropriate in the case that the aggregate is the lime stone, or admixture is OBS. The residual compressive strength is by order of the granite, basalt, and lime stone in accordance with the aggregate types, and OPC, OFS, and OBS corresponding to the admixture types.
고강도 콘크리트의 내화특성에 미치는 방화석고보드의 두께 및 접착 보강 방식의 영향
장기현(Jang Ki-Hyun),배장춘(Pei Chang-Chun),이보형(Lee Bo-Hyeong),김호림(Jin Hu-Rin),양성환(Yang Seong-Hwan),한천구(Han Cheon-Goo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
This study investigated the fire-resistant characteristic of high strength concrete according to the change of the thickness and the adhesive method of fireproof plaster board and the results are summarized as followings. From the characteristic of fresh concrete, both slump flow and air content were appeared to satisfy each target range and the compressive strength appeared the range of high strength as 89.9 MPa from the characteristic of hardened concrete. From the characteristic of spalling, at all specimens of which the upper side finishing was not performed, the severe spalling that all covered concretes on 4 sides were felled off and internal reinforcing bars were exposed was occurred and spalling was appeared to occur even to the internal concrete. But, in case of specimen of which the upper side finishing was performed, spalling was not occurred. As the highest temperature of reinforcing part of each test after fire-resistant test, 19F1-MN-N showed l036℃ and 19F1-MN-T showed 272℃. 19F1-ML-T that had grouted lightweight mortar appeared the most excellent capability as 116℃. As for mass loss rate after fire-resistant test, 19F1-MN-N appeared the most mass loss rate as 27% but specimen of which the upper side was finished appeared the low mass loss rate as around 7%.