• Title/Summary/Keyword: Ground solidification material

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A Study on the Infiltration Porperties of Cement Grout Material (시멘트계 주입재의 침투특성에 관한 실험적 연구)

  • 천병식;신동훈;이종욱;김진춘;이준우;안익균;이승범
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.03a
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    • pp.297-304
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    • 2002
  • This study is about penetrability of Micro Cement(MC) used for ground improvement. In this study, the characteristics of chemical grouting such as solidification, penetrability were analyzed experimentally by changing permeability of ground, grain size and relative density of grout material. For evaluating applicability of grout material, solidification test and penetrability test were performed. From the results of the tests, effective solidification ratio and penetrability ratio of MC was each 75%, 86% to be excellent when ground permeability was in the range of 10$^{-2}$ and 10$^{-4}$ cm/sec. Otherwise, those of Ordinary Portland Cement(OPC) were both lower than 50% to be poor. When penetrability of grout material is needed for improvement of dam foundation and soft ground, application of MC Is much superior to that of the other materials. The results of the grouting tests in the water flowing ground show that solidification effect of long gel-time grout material is excellent as injection pressure increases when groundwater velocity is relatively low. But when groundwater velocity is relatively high, solidification effect of long gel-time grout material is very poor because most grout materials are outflowed. Therefore, as groundwater velocity is high, effective solidification ratio of long gel-time grout material is better than that of short gel-time grout material, also penetration distance of long gel-time grout material is longer than that of short gel-time grout material.

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A Study on the Properties of Grout Materials Based on Cement Type (시멘트계 주입재의 주입특성에 관한 연구)

  • 천병식;최중근
    • Journal of the Korean Geotechnical Society
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    • v.18 no.5
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    • pp.229-236
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    • 2002
  • In this study, the characteristics of chemical grouting, such as solidification, penetrability, were analyzed experimentally by grain size of grout materials and permeability, relative density of the ground. For evaluating applicability of grout material, solidification tests and permeability tests were peformed. From the results of the tests, effective solidification ratio and penetrability ratio of Micro Cement were 75% and 86% respectively when ground permeability was in the range of 10$^{-4}$ to 10$^{-2}$cm/sec. On the other hand, effective solidification ratio and penetrability ratio of Ordinary Portland Cement (OPC) were both lower than 50%. When penetrability of grout material is needed for improvement of dam foundation and soft ground, application of Micro Cement is much superior to that of the other materials. The results of the grouting tests in the hydrodynamic ground show that the solidification effect of long gel-time grout material is excellent as injection pressure increases when groundwater velocity is relatively low. But when groundwater velocity is relatively high, the solidifcation effect of long gel-time grout material is very poor because most grout materials are outflowed.

A Case Study on the Test Execution for DCM using Vietnam CFBC Fly Ash Solidification Material (베트남 순환유동층 발전(CFBC) 플라이애시 고화재를 사용한 심층혼합 처리공법(DCM) 시험시공 사례)

  • Kim, Keeseok;Lee, Dongwon;Lee, Jaewon;Kwon, Yongkyu;Yu, Jihyung;Hoang, Truong Xuan;Jung, Chanmuk;Min, Kyongnam
    • Resources Recycling
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    • v.27 no.5
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    • pp.38-48
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    • 2018
  • Deep cement mixing method (DCM) is used to improve the quality of various ground type and its technical development proceeding based on performance improvements of solidification materials and mixing techniques with ground soil. In this study, it was possible to improve silty clay ground soil had 1 to 3 MPa compressive strength using solidification material that composed mainly circulating fluidized bed combustion (CFBC) power plant fly ash and reduce standard deviation of strengths from over 1.0 MPa to 0.322 MPa using improved auger bits in field test to forming more uniform bulbs than in case of using existing auger bit.

Durable Characteristic of Ground Solidification Material's Body of Hardening used Eco-friendly SCW Method (친환경 SCW공법용 지반고화재 경화체의 내구특성)

  • Jo, Jung-Kyu;Hyung, Won-Gil
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.118-119
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    • 2017
  • In the S.C.W (soil cement wall) grouting solution, Cement grout ratio of 1 part Portland cement and 1part water is being used. However, Co2 and harmful heavy metals such as cr6+ are discharged in the process, causing a serious environmental issue. The purpose of the present study is therefore to substitute cement grout to inorganic binder and identify durability properties of ground solidification materials.

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Properties of Ground Solidification Materials using Vietnam CFBC Fly Ash (베트남 CFBC 플라이애시를 사용한 지반고화재의 특성)

  • Kim, Keeseok;Lee, Jaewon;Lee, Dongwon;Yu, Jihyung;Hoang, Truong Xuan;Minh, Ha;Min, Kyongnam
    • Resources Recycling
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    • v.27 no.3
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    • pp.39-47
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    • 2018
  • According to Vietnam government establishes additional coal-fired power plants to secure generation capacity, emission of ashes is accelerating and processing them is urgent issue. This study targeted utilize fly ashes that occurred in circulating fluidized bed combusion (CFBC) power plant to use ground solidification materials. CFBC fly ashes are used to make solidification with ground granulated blast furnace slag (GGBFS), gypsum and cement. Then produced specimens by mixing with soft ground soil to confirm mixing effect of fly ash in solidification. As a result it was possible to find mixture design that is satisfied 3 MPa compressive strength in age 28 days and reduce weight loss rate over 50% in acid immersion test than plain specimens that using only ordinary portland cement.

Analysis of Physical and Chemical Properties of CFBC Fly Ash in Vietnam for Solidification (고화재 활용을 위한 베트남 CFBC 플라이애시의 물리적·화학적 특성 분석)

  • Min, Kyongnam;Lee, Jaewon;Lee, Dongwon;Kim, Jinhee;Jung, Chanmuk
    • The Journal of Engineering Geology
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    • v.27 no.3
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    • pp.245-253
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    • 2017
  • Vietnam CFBC fly ash has high CaO content and can be used as a solidification agent for soft ground improvement. However, most fly ash is treated as landfill or waste. In order to utilize fly ash as a solidification agent for soil improvement, the characteristics of fly ash must be accurately determined. In this study, laboratory tests were conducted on fly ash from four CFBC power plants to evaluate the utility of Vietnam fly ash as a solidification agent. As a result of analyzing the physical properties, it was analyzed that all four samples were suitable as material for solidification agent and have suitable particle size for the improvement of soft ground. As a result of analysis of chemical characteristics, it was analyzed that the fly ash of one place could be used as a solidification agent because of the high content of free-CaO. The remaining three fly ash was not suitable for use as a solidification agent due to low Free-CaO content. However, it has a chemical composition similar to that of general fly ash in Korea, so it can be recycled in various ways.

Strength Characteristics of Solidified Soil with Binder made of Industrial By-products (순환자원을 활용한 지반고화용 무기결합재의 강도 특성)

  • An, Yang-Jin;Hyung, Won-Gil;Mun, Kyoung-Ju;Yoon, Seong-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.11a
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    • pp.213-214
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    • 2012
  • This study is about the assessment of utilization possibility as a material for cementation of ground which is necessary for the reinforcement of soft ground by making environment-friendly inorganic composite utilizing inorganic recycled resources, and it was verified that it showed higher uniaxial compressive strength than the existing cementitious ground solidifier when it was applied as a combination material for soft ground such as dredge reclaimed land, and since an inorganic composite utilizing recycled resources such as high calcium fly ash and blast furnace slag etc. does never use cement, it is considered that it would be safe in the issue of a hexavalent chromium that was recognized as a problem of a cementitious solidifier.

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Development of Remediation and Stabilization Technique for Low-Permeable Contaminated Soil Using Waste Materials (폐기물을 활용한 저투수성 오염토양의 정화 및 안정화 기술 개발)

  • 박상규;이기호;박준범
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.10a
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    • pp.681-688
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    • 2002
  • Study was peformed to develop the‘environmental double pile’for the remediation of low-permeable contaminated soil. This technique is similar in function to‘sand drain pile’But this applies recyclable oyster shell treated as waste materials to a drain material and the pile is consisted of two layers. Inner metal pile is located in center and oyster shells are filled around it. By this technology, contaminated ground water is pumped out through the oyster shell and purified by drainage, adsorption, and reaction processes. Afterwards, the grout material is injected through the inner pile for the effect of the solidification / stabilization. As a result, the concept of this technique is a development of one-step process technology. Through the test, a consolidation characteristic by radial drain is going to be evaluated and the optimum standard of this technology will be calculated.

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Analysis of Mechanical Properties of Solidified soil using Pig Iron Slag (용선슬래그를 활용한 고화토의 역학적 특성 분석)

  • Yang, Chul-Jin;Bae, Jun-Seok;Byun, Ho-Seok;Lee, Kang-Hwi;Lee, Jong-Sik
    • Journal of the Korean Geosynthetics Society
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    • v.17 no.1
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    • pp.1-10
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    • 2018
  • We conducted research to develop a solidification agent for the ground surface reinforcement method in which activator is fused by recycling pig iron slag, which is a byproduct generated in the steel making process. The purpose of this research is to solve the problems of surface soil by improving the strength and durability of foundation soil such as soil loss, settlement, sinkhole, etc. by recycling pig iron slag from disused or landfilled steelworks. For this purpose, the possibility of using pig iron slag as a solidification soil was evaluated by the compressive strength, elution test of harmful materials, permeability coefficient test. As a result of the compressive strength test, the values of the strength of the curing 28 days of the solidified soil having the solidification agent mixing ratio of 12% were found to be 0.93, 0.96 and 1.3 MPa, respectively, satisfying the required strength value of 1 MPa, In the case of permeability coefficients, the minimum values were $4.1{\times}10^{-8}$, $7.0{\times}10^{-7}$, and $1.7{\times}10^{-7}cm/sec$, respectively, at the solidification agent mixing rate of 12%. In addition, as a result of the elution test of harmful materials, a small amount was detected in the item of hexavalent chromium but satisfied the inclusion criteria, and in the remaining items, heavy metals were not eluted.