• Title/Summary/Keyword: Korean bentonite

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An Experimental Study on the Strength-Development Properties of Mortar with Discarded Bentonite Powder (폐 벤토나이트 분말을 흔입한 모르터의 강도 발현 특성에 관한 실험적 연구)

  • 정민수;김효열;안재철;강병희
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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    • pp.23.2-29
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    • 2003
  • As the bentonite is main material to prevent from collapse of drilling hole at underground excavation works, the quantity of bentonite is increasingly used on construction industry day by day. But, the discarded bentonite that is excessively used at underground excavation works causes various environmental trouble such as soil and water pollution etc. Therefore, this study aims to propose a foundamental report about pozzolan reaction of discarded Bentonite powder by heat-treatment and cooling as concrete mineral admixture. To find out the strength-development properties of mortar with discarded Bentonite powder by indirect cooling & cooling using of water after heat-treatment, the experiments such as flow test, and compressive strength test on curing age of mortar are excuted. As a result of this study, discarded Bentonite powder can be utilized as concrete mineral admixture by heat-treatment and especially, the strength-development properties of mortar mixing with discarded Bentonite powder is superior to the situation of $600^{\circ}C$.60min-cooling using of water.

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The Permeability Characteristics of the Reactive Soil - Bentonite Landfill Liner (혼합반응 차수재의 투수특성 연구)

  • 이강원;황의석;안기봉;정하익;김학문
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.10a
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    • pp.545-552
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    • 2002
  • The purpose of this paper is to investigate permeability characteristic of soil-bentonite landfill liner and development of desirable liner system. In this study, permeability tests for soil-bentonite, reactive soil-bentonite and apply bentomat and reactive mat are carried out under the low and high water pressure. According to test result, additional amount of bentonite decreases the coefficient of permeability up to the bentonite mixture ratio of 15%. Therefore, the permeability test for landfill liner's indicated that the use of general water would be in more safe side because the liner system show low permeability duet decrease effect of porous by suspended soild(SS). The permeability of leachate for Zeolite mixture ratio 0, 5, 10% with bentonite mixture ratio 15% showed negligible variation in the permeability with general water. Therefore, Zeolite could be used as a successful that is available purification material for the treatment of leachate, without changing the of landfill liners. Also odious smell could be removed by adding smell amount of Zeolite to the leachate. It was revealed that the bentomat and reactive mat installed in soil-bentonite layer effectively improved the permeability as well as purification of the leachate.

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An Experimental Study on the Pozzolan Reaction of discarded Bentonite by Heat Treatment Condition - Focused on discarded Bentonite by cooling using of Water - (소성조건에 따른 폐 벤토나이트의 포졸란 반응성에 관한 실험적 연구 - 주수냉각을 중심으로 -)

  • 장진봉;정민수;김효열;강병희
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2002.05a
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    • pp.85-90
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    • 2002
  • This study aims to propose a fundamental report for pozzolan reaction of discarded Bentonite by heat-treatment as concrete mineral admixture. As discarded bentonite is clay mineral to contain a great quantity a lot of $SiO_2$ and $Al_{2}O_{3}$, it is anticipated to reveal pozzolan reaction ability by heat-treatment. To find out pozzolan reaction ability of discarded Bentonite slurry by heat-treatment, the experiment is excuted Phenolphtalein test, setting test, pH test and the analysis by X-ray diffractor. As a result of this study, discarded Bentonite slurry can be utilized as concrete mineral admixture by heat-treatment and especially, pozzolan reaction ability of discarded Bentonite slurry is superior to the situation of 50$0^{\circ}C$~$700^{\circ}C$, 60min.

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Permeability Characteristics of Sand- Bentonite Mixtures

  • Chang, Pyoung-Wuck;Chae, Yong-Suk
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.39 no.2
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    • pp.26-31
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    • 1997
  • Abstract A series of permeability tests was performed on the mixtures with specific mixing rates of sand and bentonite using modified rigid-wall permeameter. Sand-bentonite mixtures were permeated by organics, ethanol and TCE. Permeability of bentonite with several mixing rates had a tendency to decrease up to initial one pore volume and permeability was thereafter converged to a constant value. When sand-bentonite mixtures was permeated by water, permeability was decreased at the beginning but it was thereafter converged to a constant. Among several mixing rates, permeability was greatly decreased at 15% of mixing rate. When sand-bentonite mixtures with 15% mixing rate was permeated by ethanol, permeability was about 10 times larger value than permeability of water. Peameability was shown greater values when permeated by TCE (TrichloroEthylene) followed by ethanol. Suitable mixing rate of sand-bentonite for a liner of waste landfills was detected.

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Water Diffusion and Resaturation in Unsaturated Compacted Bentonite (불포화 압축 벤토나이트에서의 수확산 및 재포화)

  • 고은옥;이재완;조원진;현재혁;전관식
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 1998.11a
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    • pp.216-220
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    • 1998
  • Experimental studies were carried out to investigate water diffusion in unsaturated compacted bentonite for a landfill of hazardous wastes. Water content distributions were measured and water diffusion coefficients were determined when the dry densities of compacted bentonite were in the range of 1.4 - 1.8 g/㎤. Resaturation times were also calculated to analyze the ability of the compacted bentonite to retard water movement. The results obtained were as follows: Diffusion model described properly the water migration in unsaturated compacted bentonite. Water diffusion coefficients ranged from 4.30$\times$10$^{-6}$ $\textrm{cm}^2$/sec to 1.93$\times$10$^{-6}$ $\textrm{cm}^2$/sec, and decreased with increasing the dry density. The dry density of compacted bentonite was found to be an important factor to control the resaturation time by water. This study suggests that the domestic compacted bentonite should be a good barrier material against water movement in a landfill of hazardous wastes.

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Factors Affecting the Electrical Properties of Bentonite Slurry (벤토나이트 슬러리의 전기적 특성에 대한 영향인자 분석)

  • Yoo, Dong-Ju;Oh, Myoung-Hak;Kim, Yong-Sung;Park, Jun-Boum
    • Journal of the Korean Geotechnical Society
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    • v.22 no.10
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    • pp.21-32
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    • 2006
  • Factors affecting the electrical properties of bentonite slurry were identified and electric conduction mechanism in slurry was examined. Electrical conductivity of bentonite and soil-bentonite slurry linearly increases with the bentonite content. Test result indicated that the change In electrical conductivity of slurry was mainly caused by dissolved cations from bentonite particles. The relationship between electrical conductivity and bentonite content was affected by the initial electrical conductivity of slurry solution and fine content in soil-bentonite mixture. Such influences were evaluated and the calibrated relationships were suggested. Based on the suggested relationship between electrical conductivity and bentonite content, bentonite content in various bentonite and soil-bentonite slurry can be quantitatively evaluated by using electrical conductivity measurement method.

A study on the Evaluation of Permeability and Structure for Calcium Bentonite-Sand Mixtures (칼슘 벤토나이트-모래 혼합차수재의 투수 및 구조 특성에 관한 연구)

  • Yun, Seong Yeol;An, Hyeon Kyu;Oh, Minah;Lee, Jai-Young
    • Journal of the Korean Geosynthetics Society
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    • v.18 no.2
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    • pp.1-10
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    • 2019
  • This study was intended to evaluate the water permeability and structure for calcium bentonite-sand mixtures to utilize calcium bentonite as a liner. This study conducted physico-chemical properties tests, compaction tests, permeability test and Scanning Electron Microscopy analysis (SEM) analysis. It was found the higher the ratio of calcium bentonite, the lower the dry density with coefficient of permeability, and the higher the optimum moisture content. In particular, SEM analysis was found the higher the ratio of calcium bentonite, the higher the area of the montmorillonite particles. In conclusion, the optimum coefficient of permeability that finds the landfill liner condition (must be less than $1{\times}10^{-7}cm/sec$) was obtained when the ratio of calcium bentonite was 40% or higher. These findings may improve the understanding of the calcium bentonite as a liner. Calcium bentonite shows a similar permeability to sodium bentonite 7% when mixed at 40% or more. Therefore, it is considered that calcium bentonite can be utilized as a liner.

Eco-Friendly and Thermal Conductivity Properties of Magnesium oxide Matrix Utilizing Bentonite (벤토나이트를 활용한 산화마그네슘 경화체의 친환경성 및 열저항 특성)

  • Gwon, Oh-Han;Lim, Hyun-Ung;Lee, Dong-Hoon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.10a
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    • pp.64-65
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    • 2016
  • This study that prevent cancer using absorbent to inflow Radon gas in the room existing soil and rock is making board to absorb the Radon gas as a fundamental study. So, we use bentonite as a absorbent. So, we use bentonite as a absorbent. Bentonite is a 'clay mineral' composed to montmorillonite of main component that volcanic ash denatured to a clay mineral. Bentonite has fine microparticle of nano level, abundant mineral 66 of kinds, adsorbability, swelling, a positive ion(heavy metal adsorption reaction) as a bentonite's property. Using magnesia cement for oxide of magnesiuma and magnesium chloride as a main binder, we measure Radon gas absorbent efficiency and thermal conductivity.

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A Study on Stress-Strain Characteristics of Compacted Bentonite for High-Level Radioactive Waste Repository (고준위폐기물 차폐용 압축벤토나이트의 응력-변형률 거동 분석)

  • Kim, Do-Hyun;Jeong, Sang-Seom
    • Proceedings of the Korean Geotechical Society Conference
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    • 2009.03a
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    • pp.792-797
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    • 2009
  • The stress-strain characteristics of compacted bentonite are investigated using experimental triaxial compression test by Hoek-cell. Special attention given to various dry density and water absorption ratio. Based on the test results, it is shown that the stress-strain relationship of compacted bentonite is highly influenced by dry density and water absorption ratio. Also, characteristics of Bentonite is similar to the clay rather than sand. Strength of compressed Bentonite increases with higher dry density. It shows maximum strength value, if in a same condition with dry density and constrain pressure. So we determine that value as the optimistic moisture contents for the maximun strength of compressed Bentonite.

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The Purification Characteristics of the Reactive Soil-Bentonite Landfill Liner (혼합반응차수재의 오염정화특성 연구)

  • 장경준;황의석;안기봉;김학문
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.585-592
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    • 2003
  • The purpose of this paper is to investigate purification characteristic of soil-bentonite landfill liner and to develop of desirable liner system. In this study, column tests for soil-bentonite, reactive soil-bentonite and existing bentomat and reactive bentomat were carried out under the high pressure with water and leachate.

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