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류금성 ( Ryu¸ Gum-sung ),이종석 ( Lee¸ Jong-suk ),고경택 ( Koh¸ Kyung-taeg ),김성욱 ( Kim¸ Sung-wook ),이장화 ( Lee¸ Jang-hwa ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
The concrete structures in marine environment has been used type V cement(sulfate-resisting Portland cement), but according to the study results reported recently, the question has been raised for effect of the resistance to salt attack of the concrete using type V cement. It is increased the demands on the use of mineral admixtures such as fly ash, ground granulated blast-furnace slag instead of type V cement in order to improve the durability of concrete structures. This study is to investigate the durability of concretes containing fly ash. the test was carried on salt attack, carbonation, sulfate attack, and porosity analysis test. Test results showed that the resistance to salt attack, sulfate attack and pore volume was decreased, and the carbonation was in some disadvantage compared with normal concrete. But if it is used the concrete with high strength or low water-powder ratio, the concrete have not problem on the durability.
이금성(Kumsung Lee),한희수(Heuisoo Han),장동훈(Donghun Chang),윤동구(Donggu Yoon) 한국지반환경공학회 2013 한국지반환경공학회논문집 Vol.14 No.12
본 연구에서는 인공강우의 침투·배수에 의한 모형사면의 침투거동을 정확히 파악하고자 대구·경북권의 화강풍화토를 이용한 실내모형실험을 수행하였다. 강우의 침투과정과 배수과정에 대한 함수비와 모관흡수력 변화를 측정하고 부정류상태의 수치해석을 수행하여 두 결과를 비교하였다. 실험결과, 함수비와 모관흡수력의 거동은 사면의 상부, 중간부, 하부 영역에 따라 침투 거리와 하부 배수층의 영향으로 다르게 나타났다. 공극 속 지하수량 변화에 따른 투수계수 변화는 침투과정에서 함수비 증가 및 모관흡수력 감소를 즉각적이고 큰 값으로 유발하였다. 그러나 배수과정에서는 함수비 감소 및 모관흡수력 증가가 완만하고 작은 값으로 발생하였다. 강우로 인한 체적함수비와 모관흡수력이 위치에 따라 값의 차이는 있지만, 침투 및 배수시간에 따른 전형적인 함수특성곡선을 나타내었다. In this study, weathered granite model tests were performed to investigate the variation of volumetric water content and matric suction by the adsorption and desorption processes of artificial rainfall. It has been compared with numerical analysis in unsaturated condition. As the results, the behaviors of volumetric water content and matric suction were distinguished by the seepage distance separated into higher, middle and lower area, and the drainage layer located at the bottom of the experimental device. In the adsorption process, the instantaneously large change of matric suction and water content were related to the increase of permeability in soil. However, in the desorption process, the change of matric suction and water content were gradually small because of the decrease of permeability. The volumetric water content and matric suction showed the difference according to the seepage distance, however the typical characteristic curves were made by the adsorption and desorption processes.
고로슬래그 미분말을 다량 치환한 콘크리트의 온도의존성 분석
이주선 ( Lee Ju Sun ),이재삼 ( Lee Jae Sam ),류금성 ( Ryu Gum Sung ),한민철 ( Han Min Cheol ),이장화 ( Lee Jang Hwa ),한천구 ( Han Cheon Goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
This study analysis the fundamental properties of temperature-dependence corresponding the change of curing temperature classified by the replacement ratio of BS, and the results are summarized as following. As the properties of flow, plain satisfied with the target slump, and as the replacement ratio of BS increased, the flow increased, but the air content slightly decreased. The time of set delayed as the replacement ratio of BS increased, but the curing temperature 35℃, even with 80% BS replaced concrete, the time of set was faster than 5℃, 20℃ plain, so the temperature-dependence was much greater. The compressive strength was decreased as the replacement ratio of BS increased, especially as the curing temperature higher, the compressive strength was higher. Also as the age increased, the plain developed more strength, therefore it show the temperature-dependence is much larger.