• Title, Summary, Keyword: 일차점토

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Characteristics of Specimens Made from Primary Clay and Red Hwangto with MSWI Fly Ash by Sintering Process (Sintering process에 의한 MSWI fly ash를 혼합한 일차점토(一次粘土)와 적황토(赤黃土) 공시체(公試體)의 특성(特性))

  • Yoo, Seung-Chol;Kwon, Moon-Sun;Park, Sang-Min
    • Resources Recycling
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    • v.19 no.2
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    • pp.10-18
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    • 2010
  • This research investigates the feasibility of ceramic specimens made from Primary clay and Red Hwangto with MSWI fly ash. Specimens preduced by mix-design maximum 20 wt% MSWI fly ash were analysed by SEM, UTM, ICP, etc. As a result of measurement,$P_{10}$ specimen was improved on bending strength and $R_5$ specimen was improved on compressive and bending strength. Also amount of extracted heavy metal was suitable for regulatory limits. This indicates that MSWI fly ash is indeed suitable for the partial replacement of ceramic materials in bricks.

Estimation of Consolidation Settlement of Soft Clay due to Selfweight by the Finite Strain Consolidation Theory (유한 변형률 압밀이론에 의한 연약점토의 자중압밀 침하선정)

  • Yu, Nam-Jae;Lee, Myeong-Uk;Lee, Jong-Ho
    • Geotechnical Engineering
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    • v.11 no.3
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    • pp.69-80
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    • 1995
  • A numerical study was performed consolidation of soft clay with high vc difference method, based on the prover was used to estimate consolidation set Results of centrifuge model tests a using the finite strain consolidation an Analyzed results between two theories Infinitesimal theory showed more delta the finite strain consolidation theory caused by that the finite strain condo during consolidation as well as non relations.

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3-Dimensional Consolidation Analysis Considering Viscosity on Soft Clay Ground improved by Plastic Board Drain (점성을 고려한 PBD 타설 연약점토지반의 3차원 압밀해석)

  • You, Seung-Kyong;Han, Jung-Gun;Jo, Sung-Min;Kim, Ji-Yong
    • Journal of the Korean Geosynthetics Society
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    • v.4 no.4
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    • pp.39-46
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    • 2005
  • A series of numerical analyses on soft clay ground improved by plastic board drain(PBD) were carried out, in order to investigate the consolidation behavior considering viscosity of the improved ground. The applicability of numerical analyses, in which an elasto-viscoplastic three-dimensional consolidation finite element method is applied in this study, was confirmed through comparison between experimental and analytical results. As the analytical results, consolidation behavior of both settlement and excess pore pressure and effective stress in clay were elucidated. Then secondary consolidation characteristics of improved ground were estimated through compare with results of typical one-dimensional consolidation analysis.

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Leaching Characteristics on Clay Ground induced by Artesian Pressure (피압에 의한 점토 지반의 용탈 특성)

  • Yun, Daeho;Kim, Yuntae
    • Journal of the Korean Geosynthetics Society
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    • v.15 no.4
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    • pp.97-104
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    • 2016
  • This paper performed consolidation tests on soft ground with and without artesian pressure conditions to find out characteristics of leaching effects using two types of one-dimensional column equipment(height : 1,100mm, outer diameter : 250mm). Artesian pressure of 5.5kPa was applied to the bottom of soft ground inside column equipment. Distribution of salinity and shear strength with soil depth were measured after the consolidation test. From the results, it was found that distribution of undrained shear strength and salt concentrations were similar at the top of clay ground irrespective of artesian pressure condition. However, at the bottom of clay ground, the values of undrained shear strength and salt concentration under artesian pressure were lower than those without artesian pressure. This result indicates that structure of soft soil with artesian pressure was weakened by salt leaching. Electronic resistance results showed that void ratio under artesian pressure condition was more reduced than that without artesian pressure condition.

Evaluation of Applicability of Dilatometer Dissipation Test Method for Estimating Horizontal Coefficient of Consolidation in Korean Soft Deposits (딜라토메터를 이용한 수평압밀계수 추정법의 국내 지반 적용성 평가)

  • 이승래;김영상;성주현
    • Journal of the Korean Geotechnical Society
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    • v.17 no.4
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    • pp.153-160
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    • 2001
  • 딜라토메터를 이용한 현장 수평압밀계수 추정법의 국내 점토지반 및 실트질 지반에의 적용성을 평가하기 위해 국내 점토지반과 실트지반에 대하여 각각 딜라토메터 관입시험 및 소산시험을 수행하였다. 소산시험 결과로부터 DMT-C법 [p$_2$-log t법과 C-√t법]과 DMT-A법을 이용하여 수평압밀계수를 추정하여 상호 비교하였으며 다른 실험방법에서 얻어진 결과들과도 함께 비교하고 평가하였다. 비교대상으로는 동일지반의 현장 피에조콘 소산시험으로 얻어진 수평압밀계수 및 불교란시료에 대하여 수행된 로셀압밀실험 및 일차원 실내압밀실험 결과가 함께 이용되었다. 연구결과 C-√t법을 제외한 p$_2$-log t법과 DMT-A법은 국내 점토지반에 대하여 상호일치하는 결과를 줄 뿐 아니라 피에조콘 결과와도 비교적 잘 일치하는 수평 압밀계수를 측정하였으며 다른 결과와 비교할 때 신뢰성 있는 결과를 주었다. 그러나 실트질 지반에 대하여는 p$_2$-log t법만이 적용 가능할 것으로 판단된다.

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Dehydration Characteristics of Cationic Surfactant-Modified Montmorillonite (양이온성 계면활성제로 표면개질된 몬모릴로나이트의 탈수 특성)

  • Seung Yeop Lee;Soo Jin Kim
    • Journal of the Mineralogical Society of Korea
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    • v.15 no.4
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    • pp.305-314
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    • 2002
  • The dehydration of hexadecyltrimethylammonium (HDTMA)-exchanged montmorillonite has been studied using X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The dehydration in HDTMA-montmorillonite seems to influence the swelling behavior of the organo-clay during heating. The basal d(001) spacing vs temperature curve of the HDTMA-montmorillonite has one broad swelling edge with a shoulder on the low-temperature side. We believe that the shoulder at $100^{\circ}C$ for the HDTMA-montmorillonite is due to interlayer swelling induced by the initial rearrangement of surfactants, and the second edge at $200^{\circ}C$ is caused by interlayer swelling resulting from the secondary vertical reorientation of alkyl chains. It seems that the dehydration of organo-clay induces a reorientation of the alkyl chains by transition to more vertical position relative to the silicate sheets, allowing instantly greater d-spacing.

Lateral Stress and Pore Pressure During One-dimensional Consolidation of Clay (점토의 일차원 압밀과정중 작용하는 수평토압과 간극수압)

  • 김재영
    • Journal of the Korean Geotechnical Society
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    • v.20 no.6
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    • pp.5-10
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    • 2004
  • The earth pressure coefficient at rest for clayey soils in the one-dimensional state, $K_0$ obtained from the triaxial test is not correct in principle because the seepage flow is radial and the displacement of soil elements is three-dimensional. Measurements of the earth pressure and the pore water pressure during one-dimension consolidation in the consolidometer ring are presented. The earth pressure and pore water pressure are measured directly by a circular part of the consolidometer ring of a floating type at its mid height. A plastic clay showed $K_0$=0.5 irrespective of pressure in the consolidometer ring.

A Study of Consolidation Behavior of Clay Ground with Partially Penetrated PVD under Artesian Pressure (연직배수재가 부분 관입된 점토지반의 피압에 따른 압밀 거동에 관한 연구)

  • Yun, Daeho;Nguyen, Ba Phu;Kim, Jaehong;Kim, Yuntae
    • Journal of the Korean Geosynthetics Society
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    • v.15 no.1
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    • pp.47-57
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    • 2016
  • Many researchers reported that artesian pressure exists in thick soft ground of Busan Nakdong river estuary. Artesian pressure in soft ground could affect rate of consolidation, settlement and drainage capasity of prefabricated vertical drain(PVD). This paper investigated consolidation behaviors of soft ground with partially penetrated PVD subjected to artesian pressure. Laboratory tests with 1-dimensional large column equipment and their numerical analyses were carried out. Test results showed that the consolidation settlement of clay ground with artesian pressure was higher than that without artesian pressure. Due to artesian pressure, the dissipation rate of excess pore water pressure was reduced in soft ground with artesian pressure, especially at bottom part of clay ground. Numerical results were in good agreement with experimental test results.

Impact Assessment of Turbidity Water caused Clays on Algae Growth (조류성장에 미치는 점토탁수의 영향평가)

  • Park, Chan-Gab;Kang, Mee-A
    • The Journal of Engineering Geology
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    • v.16 no.4
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    • pp.403-409
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    • 2006
  • This study was performed to assess the clay impact on alga growth which was a primary producer, in view of food chain in ecosystem. As clay minerals caused turbidity, a low sedimentation, high adsorption capacity with organic matter, adsorption - desorption effect with ionic chemicals, clay minerals were supposed to have a significant effect on the aquatic system. In study we tried to turn out NOAEL (No-observed-adverse-effect-level) of clay materials on the algae growth inhibition using such as kaolinite, sericite and montmorillonite. This study was indicated. (1) In both of kaolinite and sericite, the $72hr-EC_{50}$ of them shows 2,752 mg/L and 2,775 mg/L, respectively. (2) On the other hand, in the case of montmorillonite, the $72hr-EC_{50}$ is not shown a significant difference to that of control samples. (3) It can be explained that is also a very important parameter in an alga growth. Because an alga growth was increased when the permeability of W visible radiation was increased in all clay cases. (4) It is demonstrated alga growth was affected by the characteristics of clay materials. Hence we can assess the $\ulcorner$water environmental risk assessment caused clay materials$\lrcorner$ using the alga growth inhibition level indirectly.

Stabilization Behavior of Heavy Metals in the EAF Dust-clay Body Mixtures at Various Sintering Conditions (점토계소지내에서 전기로 더스트 중금속의 소성 온도별 안정화거동)

  • Kwon, Yong-Joon;Kim, Yoo-Taek;Lee, Gi-Gang;Kim, Young-Jin;Kang, Seung-Gu;Kim, Jung-Hwan
    • Journal of the Korean Ceramic Society
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    • v.39 no.8
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    • pp.728-734
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    • 2002
  • Stabilization behavior of Cr, Cd, Cu, Pb, Fe and Zn heavy metals in the EAF dust was investigated by adding EAF dust to clay or white clay, respectively, up to 50 wt% with 10 wt% intervals and sintering at temperatures between 200 and $1200^{\circ}C$ with $200^{\circ}C$ intervals with an aid of ICP-AES followed by TCLP test to evaluate heavy metal cation exchange capacity of the clay or the white clay. The clay or the white clay had a better Cr ion exchange capacity than that of zeolite. The TCLP leaching test for the sintered specimens showed that Cr and Fe were rarely detected for all the specimens and the concentration of Cd and Zn decreased with increasing sintering temperature and decreasing EAF dust contents respectively. When the clay or the white clay were mixed with EAF dust, cation exchange may occur between the clay and the EAF dust so that the first stabilization of the mixtures containing semistabilized heavy metals may happen. Stabilization of heavy metals in the ceramic bodies was further completed probably due to the eutectic reaction caused by the sintering of semi-stabilized mixtures. It was conceivable that the white clay rather than the clay may be a better stabilizer for the EAF dust containing heavy metals.