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잔골재 종류 및 섬유혼입에 따른 콘크리트의 초기수축특성 평가에 관한 실험적 연구
남정수(Nam Jeong-Soo),박윤미(Park Yun-Mi),신관수(Shin Kwan-Soo),김영덕(Kim Young-Duck),김규용(Kim Gyu-Yong),김무한(Kim Moo-Han) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Recently the amount of crushed sand and recycled fine aggregate have been increasing due to difficulty of supplying natural fine aggregate, but the concrete used crushed sand and recycled fine aggregate has the problem which is increasing of the crack because of plastic shrinkage and drying shrinkage. To solve this problem, the study is proceeded actively for purpose of reducing crack by fiber reinforcement which has been developed diversity about early shrinkage property of concrete, but in case of existing study, it is insufficiency to apply to construction site due to unsatisfactory of quantitative estimation about early shrinkage property. Therefore, this study presents a foundational data of fiber reinforced concrete according to sort of fine aggregate for reducing shrinkage crack by comparing and examination experimentally about early shrinkage property of fiber reinforced concrete based on kind of fine aggregates.
콘크리트의 수축균열에 미치는 판상-링형 구속시험방법의 시험체 치수영향 검토
남정수(Nam Jeong-Soo),김영봉(Kim Young-Bong),김영덕(Kim Young-Duck),한민기(Han Min-Ki),김규용(Kim Gyu-Yong),김무한(Kim Moo-Han) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
In this study, to present the fundamental data for quantitative evaluation of shrinkage crack, effects of specimen size of plat-ring type restrained test were examined. To examine suitable size of specimen of plat-ring type restrained test method, restrained shrinkage crack properties such as restrained drying shrinkage stress, crack area and crack point were investigated. As conditions of specimen size, inside ring diameter of specimen were l00㎜, l50㎜ and 200㎜, and outside ring diameter of specimen in 400㎜, 600㎜ and 800㎜. These conditions were investigated by real experiment and by numerical analysis of 3D solid element using the MIDAS program. As a result, it was concluded that, as suitable specimen size for plat-ring type restrained test, inside ring diameter was more than 150㎜ and outside ring diameter was 400㎜ in this experimental conditions. Hereafter, it is considered that the study concerning environmental condition and mixing factor in plat-ring type restrained test method are need.
역학변색 센서 변형에 따른 콘크리트의 균열 변형 감지 특성
남정수 ( Nam Jeong-soo ),김규용 ( Kim Gyu-yong ),편수정 ( Pyeon Su-jeong ),최병철 ( Choi Byung-cheol ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
본 연구에서는 역학변색 센서가 부착된 섬유보강 시멘트 복합체의 균열 모니터링 기술 개발에 관한 실험적 연구를 수행하였다. 섬유보강 시멘트 복합체의 균열 발생 및 진행에 따른 센서의 색상 변화 이미지를 촬영하였으며, 촬영 영상에서 센서의 색상 변화를 분석하는 방법이 제안되었다. 해석 결과와 균열 폭의 관계로부터 균열 폭을 도출하기 위한 식을 제안하는 기초 연구를 수행하였으며, 이를 통해 한랭 환경에서 역학변색 센서의 균열 모니터링 가능 여부를 파악하기 위한 활용 가능성을 평가하였다.