• Korean Journal of Materials Research
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• v.6 no.4
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• pp.428-435
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• 1996

초미립 SiC분말과 SiC platelet을 2차성으로 Si3N4에 첨가하여 SiC/Si3N4 하이브리드 복합체를 가압소결로 제조한 후 2차상의 영향을 조사한 결과핫프레스법을 이용한 경우 SiC platelet은 Si3N4 기지 복합채의 치밀화를 저해하지 않고 초미립의 SiC 첨가는 Si3N4의 입성장을 효과적으로 억제하여 미세한 $\beta$-Si3N4의 grain을 형성함을 관찰하였다. 초미립 SiC첨가를 통한 복합체의 강도 증진은 상대적으로 $\beta$-Si3N4입자의 미세화에 의한 인성의 저하를 유도하나 SiC platelet을 첨가하여 급격한 강도 저하 없이 높은 인성을 갖는 하이브리드 복합체를 제조할 수 있었으며 SiC/Si3N4 하이브리드 복합체의 인성증진은 elongated $\beta$-Si3N4와 platelet SiC의 debonding에 의한 grain pull-out 영향임을 알 수 있었다.

• Computational Structural Engineering
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• v.36 no.3
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• pp.17-22
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• 2023

• Journal of Yeungnam Medical Science
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• v.11 no.2
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• pp.195-201
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• 1994

• Cement
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• s.150
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• pp.53-59
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• 1999

• Journal of the Korean GEO-environmental Society
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• v.18 no.10
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• pp.15-22
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• 2017

The soil improvement method so far has been developed with an emphasis on enhancing the strength of the ground. A soil improvement method using a excellent cementitious stabilizer in economical efficiency and handling property is mainly used. The soil improvement method using cementitious stabilizer is effective but environmental and human harmful substances are detected and environmental problems such as carbon dioxide emission and groundwater pollution are pointed out. Therefore, as part of an alternative method capable of solving such problems, researches on the soil improvement method incorporating biological technology are being actively carried out. This study was conducted to investigate the characteristics of strength change when mixed with environmentally friendly soil binder and microorganism in clay, and it was analyzed by uniaxial compression test, direct shear test, SEM, XRD. As a results of the test, we confirmed the cementation caused by microbially induced calcite precipitation and the strength increase enhancement by it.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.765-768
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• 2008

Silica fume is a very important gradient in UHPC(Ultra High Performance Concrete) and its amount is normally over 25% of cement(wt.%). But we surely need to comprehend the influence of the amount of silica fume on the UHPC. In this paper, it was investigated how the amount of silica fume influence on the properties such as fluidity, compressive strength, elastic modulus, and flexural strength. Furthermore, it was examined the internal micro structure on UHPC through the test of SEM and MIP. In results, If we properly use silica fume in UHPC, fluidity and strength of UHPC was increased. It can be ascertained through the test of MIP that silica fume effectively increased density of UHPC by posolanic reaction and acting as filler. Especially, In case of Cement to silica fume ratio$0.1{\sim}0.25%$, we can be concluded that UHPC has similar to mechanical property.

• Journal of the Korean GEO-environmental Society
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• v.14 no.8
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• pp.5-9
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• 2013

In this study, it was examined a strength characteristic of organic acid material that is eco-friendly and low energy as a soil improving material. The object of this study is to analysis of strength changes with observing the clay mixed organic acid material through the unconfined compression strength test and triaxial compression test during 28 days. As a result of the tests, the strength of clay mixed organic acid material is increased when the more ages are prolonged, the more organic acid material mixture ratio growed. Therefore, in grasping the strength improvement effects of clay by organic acid material mixing, it confirmed that organic acid material as soil improving material is effective through unconfined compression strength test and triaxial compression test. Through this test, the definite strength increase is confirmed according to the mixture of the organic acid material and the possibility of soil improvement is also confirmed based on this result. From now on, detailed examination and field test will help closely to definite strength characteristics.

• Food Engineering Progress
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• v.21 no.2
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• pp.138-142
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• 2017

This study investigated the possible use of enzymatically hydrolyzed isolated soy protein (eHISP) to enhance the intensity of salty taste. The sodium chloride content of eHISP is 69.5 g/L. Yellowness (b) increased, and lightness (L) and redness (a) decreased with increasing eHISP concentration in sample solution. Also, perceived salty intensity of eHISP solution increased in sample solution with increasing added amount of eHISP with same NaCl concentration. The intensity of the salty taste was enhanced by 2-39% as the eHISP was added. The results suggest that it may be possible to reduce the content of sodium chloride in foods by enhancing the salty taste with eHISP.

• Polymer(Korea)
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• v.32 no.2
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• pp.183-188
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• 2008

Reinforced open cell micro structured foams were prepared by the polymerization of high internal phase emulsions incorporating inorganic thickeners. Organoclays were used as oil phase thickener, and sodium montmorillonite was used as aqueous phase thickener. Rheological properties of emulsions increased as oil phase thickener concentration and agitation speed increased, due to the reduced drop size reflecting both competition between continuous and dispersed phase viscosities and increase of shear force. Drop size variation with thickener concentration could be explained by a dimensional analysis between capillary number and viscosity ratio. Upon the foams polymerized by the emulsions, compression properties, such as crush strength and Young's modulus were measured and compared. Among the microcellular foams, the foam incorporated with an organoclay having reactive group showed outstanding properties. It is speculated that the exfoliated silicate layers inside polystyrene matrix, resulting in nanocomposite foam, are the main reason why this foam has enhanced properties.

• Clean Technology
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• v.7 no.2
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• pp.109-117
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• 2001

Whereas commonly used to make concrete having rich water contents as binder or mineral admixture, blast furnace slag has been rarely applied to manufacture in concrete based products having poor water contents. This study, for the multi-recycling of blast furnace slag, is to analyze strength enhancement mechanism of concrete based products using blast furnace slag. The results of this study are following. We found that blast furnace slag is very effective mineral admixture to manufacture high strength spacer having over $400kgf/cm^2$ in compressive strength. Also, enhancement of strength by blast-furnace slag are responsible to densified grading and pozzolanic reaction.