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조선규(Sun-Kyu Cho),전귀(Gui Jeon),신치범(Chee-Burm Shin) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.3
An increase of concrete construction in marine environments as well as an increasing use of marine aggregate at the mixing stage of concrete has provoked an important problem. A high concentration of chloride ion in the vicinity of steel bars in concrete is the principal cause of premature reinforcement corrosion in concrete structures. In this study, the behavior of chloride ions introduced into concrete from concrete surface by marine evironment was analysed. A mathematical model including the diffusion of chloride ion in aqueous phase of pores, the adsorption and desorption of chloride ions to and from the surface of solid phase of concrete and the chemical reactions of chloride ions with solid phase was presented. Finite element method was employed to carry out numerical analysis. The results of this study may be used to predict the onset of reinforcement corrosion and to identify the maximum limit of chloride ions contained in concrete admixtures.
전귀,류영기 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.5
공기분리용 고분자 다층복합막을 제조하였다. 코팅물질로는 poly(dimethylsiloxane)과 poly-4-methyl-1-pentene이 사용되었다. 다공성 지지체로는 polysulfone막이 사용되었다. 제조된 막에 대해 압력 및 코팅층의 두께비 변화에 따른 산소와 질소의 투과실험을 행하였고 이를 저항모델에 적용하여 막의 구조, 투과도와 선택도 사이의 관계를 해석하였다. 저항모델로 예측된 투과도 계수와 ideal separation factor 값은 실험치와 대체로 일치하였다. 막양단의 압력차가 5 ㎏/㎠이고 cut의 값이 0.05인 조건으로 ideal separation factor의 값이 3.4인 3층 복합막에 공기를 투과시킴으로서 약 34.5%의 산소부화공기를 얻을 수 있었고 이 때 산소에 대한 투과도는 1.9×10^(-5)[㎤(STP)/㎠·sec·㎝Hg]이었다. Multilayer types of thin film composite(TFC) membranes were prepared. Poly(dimethylsiloxane) and poly-4-methyl-1-pentene were used as a coating material and polysulfone was used for a porous support membrane. Permeation data of oxygen and nitrogen through TFC membranes at different pressure and thickness ratio of coating layer were obtained and the relationship between structure of membranes, permeability and selectivity were analyzed by applying resistance model. The values of permeability coefficient and ideal separation factor predicted by resistance model were well fitted with the experimental data. Oxygen was enriched up to 34.5% in the permeate stream under the condition that pressure difference and cut were 5 ㎏/㎠ and 0.05 respectively. The ideal separation factor of this three-layer TFC membrane was 3.4 and the permeability of oxygen was 1.9×10^(-5)[㎤(STP)/㎠·sec·㎝Hg].
최창균,전귀 한국화학공학회 1986 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.24 No.2
수용액내에 부유하고 있는 화이트카본 미립자의 효율적인 제거를 위한 방법으로 내부원통이 회전하는 수평 쿠엣트 응집기를 사용하여 고분자응집제의 첨가하에서 연속계의 응집현상을 관찰하였다. Taylor 수, 평균속도구배와 교반시간이 응집에 미치는 영향을 실험으로 살펴보았으며 응집 정도는 평균침강속도, 투과도 및 침전물의 체적등으로 측정되었다. 이로부터 응집은 교반시간 초기에 급격히 일어나고, 1000<Ta<2500 영역에서는 약 100초의 최적교반시간이 존재하였으며 Ta ○2300에서 응집이 가장 잘 이루어짐을 밝혔다. Ta>2300 영역에서는 최적교반시간이 지수적으로 감소하는 경향을 나타냈으며 Ta>3400 영역에서는 최적 Gt값이 10⁴으로 거의 일정한 값을 보였다. The continuous flocculation to remove fine particles of White Carbon suspended in the water was investigated experimentally by using the horizuntal Couette flocculator of which the inner cylinder is rotating. The effects of the Taylor number, the mean velocity gradient and the retention time on flocculation caused by a polymer flocculant were examined systematically. The extent of flocculation was decided by measuring the average settling rate, the light transmittance and the volume of sediment. It was found that particles were flocculated very easily at a very short retention time. The optimum retention time was about 100 seconds in the region of 1000 < Ta < 2500 and the best flocculation was produced at Ta ○2300 W hen Ta > 2300, the optimum retention time decreased exponentially and the optimum Gt (root mean square velocity gradient product retention time) values were found to be about 10⁴ in the region of Ta >3400.