• Journal of the Korean GEO-environmental Society
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• v.11 no.4
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• pp.33-42
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• 2010

The lightweight foamed concrete is used to reduce the weight of the backfill material. When it is applied, the volume is often contracted due to segregation, necessitating re-injection. In this study, it was manufactured a new lightweight foamed concrete by adding plasticizer and tested the engineering properties of the material. The tests included unconfined compressive strength test, unit weight test, flow test, pH test, and permeability test. The plasticizer is shown to have an important influence on the flow. It was shown that 2~2.4% of plasticizer was adequate. The new material was shown to have positive influence on the flow and reduction of weight when applied to the backfill of the structures.

• Journal of Korea Soil Environment Society
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• v.2 no.1
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• pp.91-97
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• 1997

The result of an investigation conducted to study the effect of crude oil contamination on the geotechnical properties of sand is presented. The effect of the degree of oil contamination on compaction charateristics, shear strength, and one-dimensional compression charateristics has been investigated. The test results indicate that the compaction charateristics are somewhat influenced by oil contamination The angle friction of sand (based on total stress basis) decreases due to the presence of oil within the pore spaces in sand. The compression charateristics of sand are significantly influenced by oil contamination. The details of the tests conducted and the results are presented in the paper.

• Journal of the Korean GEO-environmental Society
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• v.11 no.5
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• pp.25-34
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• 2010

In this study characteristics for reclaimed ash was studied to enlarge the usage of reclaimed ash which is reaching to 72 million ton producted from whole thermal power plants in South Korea. Fly ash and bottom ash are reclaimed separately at some of thermal power plants. However, typically bottom ash and fly ash are mixed when they are buried at most of the thermal power plant, as a result the engineering characteristics of ponded ash are not investigated properly. In order to investigate the engineering characteristics of the ponded ash, laboratory tests were performed with ponded ash and fly ash from youngheung and samcheonpo thermal power plants. Specific gravity, unit weight, and grain size analysis test were fulfilled to evaluate the physical characteristics and triaxial permeability test, direct shear test, unconfined compressive strength test, compaction test were performed to evaluate the mechanical characteristics. And also engineering characteristics of coal ash from anthracite and Bituminous thermal power plants were compared and studied respectively. As a result of the study, it was confirmed that using coal ash from Bituminous thermal power plants can be effective in the place where lightweight materials are required and using coal ash from anthracite thermal power plants can be effective as backfill material which require higher permeability. Finally, it was confirmed that fly ash from youngheung thermal power plants which has the lowest permeability among the tested material is suitable for a field requiring impermeable material.

• Journal of the Korean Geotechnical Society
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• v.24 no.10
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• pp.113-120
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• 2008

It is difficult to acquire good-quality fill material for levee in field and it is the most important factor of levee construction technology to use the bed sediment for the safe and economic construction. So, it is necessary to evaluate geotechnical characteristics of bed sediment, design and construction method through field application tests. In this study geotechnical characteristics of Hyunpoong bed sediment (SP) in Daegu were analyzed, and laboratory/field compaction test for mixing granite weathered soil (SW) was performed. And field mixing method was suggested.

• Journal of the Korean Geotechnical Society
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• v.17 no.6
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• pp.69-83
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• 2001

In order to make use of finished municipal landfill as a construction site, it is necessary to consider environmental and geotechnical aspects for the ground improvement and application of waste landfill. In environmental aspect, methods for management of landfill gas and leachate have to be established, and in geotechnical aspect, it is necessary to investigate available method for constructing structure foundation. In this study, the finished landfill was selected for pilot test. Investigation about the environmental characteristics of the waste landfill was performed to establish the methods far management of landfill gas according to monitoring the gas quantity and to investigate economical efficiency according to utilizing landfill gas. Investigation about cases of utilizing the waste landfill in Korea and abroad as construction site was performed and pilot tests were performed to analyze the improvement effects of methods such as dynamic compaction method and PG pile method available to waste landfill. The results of this study showed that economical profits could be gained by utilizing landfill gas and improved waste landfill, besides, dynamic compaction method was effective in case of improvement depth being shallow, and PG pile method was effective in case of improvement depth being deep.

• Journal of the Korean GEO-environmental Society
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• v.9 no.2
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• pp.15-22
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• 2008

Recently loess are used as design and construction materials in some construction sites. However, many problems have come to the fore because the loess was considered merely as ordinary soil, not taking the engineering characteristics of loess into account at all. The purpose of this study is to effectively mix and use the oyster shell-which is the byproduct of oyster farming in the clean and pure water zone of Southwestern region-with loess in a bid to increase the utility, considering that loess itself has the limit for civil engineering purpose, and research the usability of oyster shell as an alternative material for construction.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09a
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• pp.1377-1380
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• 2010

본 연구에서는 해양준설퇴적물의 유효활용을 위한 역학적, 환경적 실험을 통한 건설재료로서의 활용성을 검토하였다. 울산 방어진과 진해 행안만에서 수거한 준설토로 고화처리토 및 경량혼합토 공시체를 제작하여 압축특성 및 응력-변형 거동 등 공학적 실험을 실시하였다. 해양오염토 유효활용을 위한 활용방법도 예시하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.10 no.1
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• pp.190-196
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• 2006

In the existed study, a fire outbreak in a reinforced concrete structure looses the organism by the different contraction and expansion of hardened cement pastes and aggregate, and causes cracks by thermal stress, leading to the deterioration of the durability. So accurate diagnosis of deterioration is needed based on mechanism of fire deterioration in general concrete structures. Fundamental information and data on the Properties of concrete exposed to high temperature are necessary for accurate diagnosis of deterioration. Therefore, This study is willing to propose fundamental data for quick and accurate diagnosis of deteriorated concrete structure by fire damage with making variable concrete test specimen, exposing high temperature environment, observing the explosive spalling and examining engineering property.

• The Science & Technology
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• v.35 no.11 s.402
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• pp.89-89
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• 2002

해양에는 수온 또는 기압 등 다양한 극한 환경이 존재하며 이러한 극한 해역에 있는 해양 미생물들은 특별한 생리적 특성을 보여 생물공학적 이용가능성에 대한 큰 기대를 갖게하여 현재 활발한 연구가 진행되고 있다.

• Journal of the Korean Professional Engineers Association
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• v.44 no.1
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• pp.10-11
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• 2011

(주)이산은 각 분야별 전문지식과 경험을 축적한 기술진이 최신의 전산시스템, 공학적 전문프로그램으로 사업특성에 맞는 최적의 엔지니어링 서비스를 제공하고 있는 기업이다. 건축전기설비계의 대가인 (주)이산 정춘병 환경플랜트부 부사장을 만나 그의 삶과 리더십에 대해 들어본다.