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겹침이음실험을 통한 삼중나노소재 혼입 철근콘크리트보의 부착성능에 대한 실험적 고찰
유진규(Jin-Gue Ryu),손동희(Dong-Hee Son),배백일(Baek-Il Bae),유창기(Chang-Gi Yoo),최창식(Chang-Sik Choi) 대한건축학회 2023 대한건축학회논문집 Vol.39 No.10
This study aims to assess the impact of combining triple hybrid reinforced concrete with carbon nanotubes, nanosilica, and graphene oxide on bond strength. The mechanical properties of these materials were evaluated through material testing and assessed bond strength via lap-splice experiments. The material testing revealed that nano-reinforced concrete had a slight increase in compressive strength compared to regular concrete but showed a significant improvement in splitting tensile strength. It also exhibited decreased volumetric strain and Poissons ratio. To understand if these mechanical properties influenced bond strength, laboratory splice experiments were conducted using eight reinforced concrete specimens, varying splice length and cover thickness. The results of the lap-splice experiment showed variations in bond strength depending on the inclusion of nanomaterials in the mixture, with varying increases in bond strength as splice strength changed. This suggests that the combination of these triple nanomaterials does impact the bond performance of concrete.
강지웅 ( Ji Woong Kang ),권오헌 ( Oh Heon Kwon ),유진규 ( Jin Gyu Ryu ) 한국안전학회 2009 한국안전학회지 Vol.24 No.4
The hybrid composite materials are recently used in many field as an advanced material due to their high resistance to fracture. However, hybrid composite materials have several problems, especially delamination, compared with homogeneous materials such as an aluminum alloy, etc. In this study, we carried out the tensile test to study the tension failure appearances and tensile ultimate strength of CFRP/Al/CFRP hybrid composite materials. The CFRP material used in the experiment is a commercial material known as CU175NS in unidirectional carbon prepreg. Also Al/CFRP/Al hybrid composites with three kind length of a single edge crack were investigated for the relationship between an aluminium volume fraction and a crack length. The crack length was measured by a traveling microscope under a universal dynamic tester. Futhermore the stress intensity factor behavior was examined according to a volume fraction and an initial crack length ratio to a width.