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崔鎔湜,金永鎭,李鎭鎬 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1
The objective of this paper is to develop a computational model and a software for predicting fatigue growth life of collinear multiple surface cracks under constant amplitude loadings and variable amplitude loadings. After examining crack growth rate data for CT specimens and surface crack specimens, empirical equations for surface crack geometry are proposed to predict the crack growth rate. In order to verify the proposed algorithm, a life prediction program has been developed. Several case studies were performed to check the accuracy of the proposed model and to verify the usefulness of the developed program. A good agreement was observed between the numerical results based on the proposed model and the published experimental data.
옥시칼본계 화합물의 포오틀랜드 시멘트 광물에 대한 흡착거동
김창은,최진호,유종석 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
The rheological properties of the cement mineral-sodium gluconate-water system were investigated by determining the adsorbed amount of sodium gluconate, the sedimentation velocity of cement particles, and viscosity of the cement paste. IR and SEM were used to analyze the adsorbed phase on cement minerals. The results of experiment were as follow: 1. In the case of containing gypsum, the adsorbed amount of sodium gluconate on OPC could be calculated from the sum of that on each mineral component. 2. In general, the fluidity of the cement paste was increased with the equilibrium concentration. 3. There were maximum values of the amount adsorbed and viscosity at equilibrium concentration of 0.3% for C₃A in the solution system. 4. The adsorbed phase of sodium gluconate on C₃A could be identified by the IR analysis with the wavelength region of 3200??(-OH), 2800??(C-H), and 1600??( ?? ) 5. As shown in microstructure analysis with SEM, the layered type structure of hydrated C₃A could incorporate with polar compound or ionic species to form a interlamella complex. Due to the large surface area of layed structure of C₃AHx, the extraordinary high amount of gluconate anion adsorbed C₃A matrix could be well explained also comparing with hydrated C₃S.
Thermal Deintercalation of Ethylammonium-Aluminosilicate Intercalates with Various Layer Charges
Choy, Jin-Ho,Choi, Young-Joon,Han, Yang-Su The Korean Ceramic Society 1995 The Korean journal of ceramics Vol.1 No.1
Ethylammonium-layered aluminosilicates intercalates were prepared by ion exchange reaction between the layered silicates with different layer changes density of 0.32∼0.41 e per unit formula and ethylammonium chloride. A kinetic study on the thermal deintercalation of the ethylammonium-layered silicate intercalates was carried out by range of 350℃ to 480℃ (heating rate of 10℃/min). Based on the Ozawa's method, the activation energies of the thermal deintercalation reaction were estimated as 171.2∼133.0 kJ/mol, which increase linearly with the layer charge densities.