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플로린화에 의한 표면 개질된 폴리프로필렌 섬유보강 모르타르의 역학적 특성
윤현도(Yun Hyun-Do),이병기(Lee Byouug-Ky),김도수(Kim Do-Su),길배수(Khil Bae-Su),남재현(Nam Jae-Hyun),노재성(Rho Jae-Seong) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
Concrete, as the most commonly used construction material, is developing towards high performance, i.e, high strength, high toughness, high durability, and good workability. Shrinkage and permeability resistance of concrete are two Important properties relating to durability. An important measure of improving concrete impermeability is to improve the capability of resisting shrinkage and cracking. Reinforcement of concrete wIth randomly distributed short fibers may Improve the toughness of cementitious matrices by preventing or controlling the initiation, propagation, or coalescence of cracks. The fibers used are mainly steel fibers, carbon fibers, and polymer fibers. Among the polymer fibers, polypropylene fibers have attracted most attention due to the outstanding toughness of concrete reinforced with them. In order to improve the bond strength of polypropylene, various fluorination methods were applied to modify the surfaces of polypropylene fibers.<br/> The effect of the modification of polypropylene fiber surface on the shrinkage and mechanical properties was investigated. Test results indicated that with use of fluorinated polypropylene fiber, it promotes stability strength or flexural strength rather than the specimen added the general mortar and polypropylene fiber. The results showed that resisting on the crack is 97% in the mortar and over 50% than the general polypropylene fiber fluorinated polypropylene fiber mortar wIll be used to construct in contacting with outsides like external wall finish and it will promote workability and durability or crack resIitance.
탄소섬유복합체 그리드 보강 콘크리트 기둥에 관한 연구 동향
윤현도(Yun, Hyun-Do),박완신(Park, Wan-Shin),김선우(Kim, Sun-Woo),김정은(Kim, Jeong-Eun) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.11
Reinforced concrete is the most widely used construction material for building structures. However, the durability of this material is reduced due to various factors such as the cracking of concrete and corrosion of steel reinforcement. Fiber Reinforced Polymer (FRP) material, which is highly evaluated for its applicability as a concrete reinforcement, is known to be effective in enhancing the durability of structures. In this study, previous research on concrete column reinforced with carbon fiber reinforced polymer (CFRP) grid was reviewed. By analyzing these studies on replacing steel hoop, a concrete column reinforcement, with CFRP grid, it could provide reference data for future research on CFRP grid reinforced concrete columns and basic data necessary for designing CFRP grid reinforced concrete columns. The concrete column that replaced the steel hoop with the CFRP grid was divided into three categories: the column under concentric loading, the column subjected to bending and axial force, and the lateral confinement effect of the column. As a result, regarding behavior characteristics, there was no difference between ordinary steel hoop and CFRP grid; therefore, the possibility of substituting CFRP grid for ordinary steel reinforcement was confirmed. However, brittle fracture of the CFRP grid was observed during this experiment; further research on the improvement of joint strength of the CFRP grid edge joint is needed. Upon analyzing the proposed equation for the lateral confinement effect, it was found that the equations for estimating the ultimate strength of confinement concrete suggested by previous researchers could even be applied for the CFRP grid reinforced concrete column.