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실리카흄의 겉보기 밀도에 따른 80MPa급 고강도 콘크리트의 경화 전후 물성
조홍범 ( Cho Hong-bum ),김영선 ( Kim Young-sun ),전현수 ( Jeon Hyun-soo ),손원일 ( Son Weon-il ),석원균 ( Seok Won-kyun ),이재명 ( Lee Jae-myung ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In the production of high-strength concrete of 80 MPa or more, silica fume is widely used as a binder to ensure the strength safety and pumpability of concrete. The bulk density of silica fume is an important physical property that can have a significant impact on the performance of concrete. Therefore, Understanding the effect of silica fume density on the physical properties of concrete and selecting the appropriate material with the correct density is crucial to ensuring optimal performance in construction projects.
동절기 공동주택 갱폼 개구부 천막보양에 따른 보양 온도 분포 분석
조홍범 ( Cho Hong-bum ),송진희 ( Song Jin-hee ),김영선 ( Kim Young-sun ),최지수 ( Choi Ji-su ),이규남 ( Lee Kyu-nam ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
CFD analysis was performed to analyze the temperature distribution of the inner space of the curing house according to blocking the opening of the gang-form with a tent in case of concrete pouring and heat curing of the apartment house during the winter season. If the gang-form opening is closed with a tent during internal heating using a hot air blower in the winter, the internal temperature rises compared to the non-reserved due to air-tightness of the curing spaces, and uniform temperature distribution can be ensured. In addition, it is possible to increase curing efficiency by reducing the amount of heat supplied and shortening the heating time.
원자로 입출구 노즐 이종금속 용접부 Weld Inlay 레이저 클래딩 공정 개발
조홍석,정광운,모민환,조기현,최동철,이장욱,조상범,Cho, Hong Seok,Jung, Kwang Woon,Mo, Min Hwan,Cho, Ki Hyun,Choi, Dong Chul,Lee, Jang Wook,Cho, Sang Beum 한국압력기기공학회 2015 한국압력기기공학회 논문집 Vol.11 No.1
This study was investigated to develop process technology of laser cladding with austenite stainless steel for Weld Inlay repair of dissimilar metal weld in reactor vessel in/outlet nozzles. Weld Inlay experiments were performed by laser cladding repair system consisting of common manipulator, laser apparatus and welding process scheduler, etc. Single pass welding experiments were conducted in order to obtain the optimum welding process parameters for filler wires of ER309L and Alloy 52M before multi-layer laser cladding. Based on the above obtained results, multi-layer laser cladding experiments were carried out, and welding qualities for weld specimens were estimated by PT, OM, SEM and EDS analysis. Consequently, it was revealed that multi-layer laser cladding on austenite stainless steel using filler wires of ER309L and Alloy 52M could be possible to meet ASME Code standard without any weld defect.