• Proceedings of the Petrological Society of Korea Conference
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• 2003.05a
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• pp.90-92
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• 2003

• Proceedings of the Mineralogical Society of Korea Conference
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• 2002.05a
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• pp.62-65
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• 2002

• Proceedings of the Mineralogical Society of Korea Conference
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• 2002.05a
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• pp.90-92
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• 2002

• Mineral and Industry
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• v.14 no.2
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• pp.9-17
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• 2001

• Proceedings of the Mineralogical Society of Korea Conference
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• 2003.05a
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• pp.90-92
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• 2003

• Journal of the Mineralogical Society of Korea
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• v.15 no.3
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• pp.147-159
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• 2002

Weathered bentonites occcur as surficial alterations of some domestic bentonite deposits in the Tertiary formations, with the thickness of less than about 50 cm, along naturally-formed weathering surface with slopping in gentle. 7 $\AA$-halloysite was found together with montmorillonite in the weathered bentonite. Compared to normal bentonite, the weathered one is generally more clay-rich and contains little amounts of original rock-forming minerals and residues. In the electron microscopy, fine-scale occurrence of the clay minerals tends to be somewhat discrete and segregated rather than closely associated. h curled margin of montmorillonite lamella is deformed to become obtuse in the weathered bentonite. Halloysite occurs as acicular to tubular crystals with the length of less than 2 $\mu$m and the width of about 0.3 $\mu$m, which commonly forms bundle-shaped aggregates. Electron microscopic observations on the fine-scale occurrence and texture of the wtathered bentonites indicate that the clay mineral transition from montmorillonite to halloysite has undergone without accompanying any intermediate phases of both clay minerals such as a mixed-layered type (M/H). The alteration reaction between these two clay minerals probably took place in the form of dissolution and precipitation mechanism in oxidation condition. An intense chemical leaching of SiO$_2$, Na, K and Ca might occur during the alteration reaction, forming a lot of dissolution cavity and residual concentration of A1$_2$O$_3$ and Fe, relatively. As the result of the chemical change, a fsvorable condition for halloysite formation seemed to be provided.

• Journal of the Korean Chemical Society
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• v.16 no.3
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• pp.193-199
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• 1972

Bentones from Korean bentonites were first prepared by reacting bentonites with high molecular weight imidazolines. The cation exchange capacity of bentonites was found more than 100meq/100g sample. Greases were then prepared by dispersing bentones into a lubricating oil and milling through a three-roll dispersion mill. Consistency in microscale, oxidation stability (static), water resistance, and wear property of the greases were tested by the ASTM methods, and good experimental results were obtained.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.09a
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• pp.241-246
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• 2004

매립지 차수층에는 다짐점토층이 사용되고 있지만 건조/수축, 동결/융해 등의 환경적인 영향에 대한 내구성을 향상시키기 위한 기능성 복합차수층에 대한 연구가 진행되고 있다. 본 연구에서는 원지반토양에 고화재를 첨가한 BLT층과 벤토나이트와 미생물 배양액을 첨가한 BLM 층으로 구성된 복합차수층의 차수기능과 BLM층에서 미생물 배양액 첨가에 따른 Bio-barrier 기능을 평가하였다. 원지반토양에 고화재와 벤토나이트를 각각 8, 10%(w/w)를 첨가하였r고, 미생물 배양액은 1%(v/w)을 첨가하였다. 실험결과 원지반토양은 SC계열의 토양으로 분류되었고, BLT, BLM 차수층의 8% 혼합비율에서도 1$\times$ $10^{-7}$cm/sec 보다 낮은 투수계수를 나타내었다. BLM 층에 첨가된 미생물 배양액에 의한 Bio-barrier 기능 실험결과 미생물 배양액 첨가에 의하여 침출수에 대한 내구성이 향상된 것을 확인할 수 있었다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2010.05a
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• pp.177-178
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• 2010

• Proceedings of the Petrological Society of Korea Conference
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• 2003.05a
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• pp.40-43
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• 2003