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분산형 빗물관리시설 적용을 위한 수질정화기능 여재 성능 평가
박찬기,김춘수,김황희,유성열,전지홍,Park, Chan Gi,Kim, Chun Soo,Kim, Hwang Hee,Yoo, Sung-Yeol,Jeon, Ji Hong 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
In this study, the water quality purification of new medias which were NPS media, hyugato, mineral stone, charcoal for applying soil media of Integrated Management Practices (IMPs) of Low Impact Development (LID) were evaluated. The influent concentrations of COD, T-N, and T-P were 117.8 mg/L, 17.1 mg/L, and 2.062 mg/L, respectively. The infiltration capacities of NPS media, hyugoto, mineral stone, charcoal, and gravel were $7.1{\times}10m/s$, $7.3{\times}10^{-5}m/s$, $7.9{\times}10^{-5}m/s$, $6.0{\times}10^{-5}m/s$, respectively. All media meet criteria of infiltration capacity as surface soil layer at IMPs which is over $1.0{\times}10^{-5}m/s$. Maximum removal rates of COD, T-N, and T-P occurred at Charcoal with 98 % of COD removal rate, NPS with 78 % of T-N removal rate, and hyugato with 75 % fo T-P removal rate, respectively. For more high removal efficiency of all water quality item, the mixed media which is 4.5(NPS media): 1(charcoal) : 4.5 (hyugato) as volume ratio was evaluated. The infiltration capacity of mixed media was $7.9{\times}10^{-5}m/s$ and met the criteria of infiltration as surface soil layer. The water quality removal efficiencies of mixed media were very high with showing 70 % for COD, 85 % for T-N, and 71 % for T-P. The mixed media could purify the water quality of surface runoff and was recommended to used at the LID site of ground water quality problem.
고강도 실리카퓸 콘크리트와 탄소섬유보강 폴리머 보강근의 부착강도 분석
박찬기 ( Park Chan-gi ),원종필 ( Won Jong-pil ),이상우 ( Lee Sang Woo ),김종옥 ( Kim Jong-ok ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
The influence of silica fume on the bonding strength between carbon fiber reinforced polymer rebar (CFRP rebar) and high strength silica fume concrete have been evaluated in this study. The influence of the silica fume depending on replacement ratio of silica fume to cement weight was investigated such that the replacement ratio is varied to 5 %, 10 % and 15 %. An direct bond test were performed to evaluate the effect of silica fume on bond properties of high-strength concrete and CFRP rebar. The test results indicated that the compressive strength of high strength concrete is affected by replacement ratio of silica fume. The bonding strength tests of the CFRP rebar and high strength silica fume concrete show that the bonding strength increases as the strength of concrete improves. Also, the results showed increased bond performance as replacement ratio of silica fume increased.
박찬기 ( Park Chan Gi ),원종필 ( Won Jong Pil ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.2
Over the last decade fiber-reinforced polymer (FRP) reinforcement consisting of glass, carbon, or aramid fibers embedded in a resin such as vinyl ester, epoxy, or polyester has emerged as one of the most promising and affordable solutions to the corrosion problems of steel reinforcement in structural concrete. But reinforcing rebar for concrete made of FRP rebar has linear elastic behavior up to tensile failure. For safety a certain plastic strain and an elongation greater than 3% at maximum load is usually required for steel reinforcement in concrete structures. The same should be required for FRP rebar. Thus, the main object of this study was to develop new type of hybrid FRP rebar Also, this study was evaluated to the mechanical properties of Hybrid FRP rebar. The Manufacture of the hybrid FRP rebar was achieved by pultrusion, and braiding and filament winding techniques. Tensile and interlaminar shear test results of Hybrid FRP rebar can provide its excellent tensile strength-strain behavior and interlaminar stress-strain behavior.
콘크리트 보강용 고연성 하이브리드 FRP 보강근의 인장 및 파괴 특성
박찬기,원종필,Park, Chan-Gi,Won, Jong-Pil 한국농공학회 2004 한국농공학회논문집 Vol.46 No.1
FRP re-bar in concrete structures could be used as a substitute of steel re-bars for that cases in which aggressive environment produce high steel corrosion, or lightweight is an important design factor, or transportation cost increase significantly with the weight of the materials. But FRP fibers have only linearly elastic stress-strain behavior; whereas, steel re-bar has linear elastic behavior up to the yield point followed by large plastic deformation and strain hardening. Thus, the current FRP re-bars are not suitable concrete reinforcement where a large amount of plastic deformation prior to collapse is required. The main objectives of this study in to evaluate the tensile behavior and the fracture mode of hybrid FRP re-bar. Fracture mode of hybrid FRP re-bar is unique. The only feature common to the failure of the hybrid FRP re-bars and the composite is the random fiber fracture and multilevel fracture of sleeve fibers, and the resin laceration behavior in both the sleeve and the core areas. Also, the result of the tensile and interlaminar shear stress test results of hybrid FRP re-bar can provide its excellent tensile strength-strain and interlaminar stress-strain behavior.