• 레미콘
• /
• 10호통권69호
• /
• pp.2-11
• /
• 2001

This paper describes the feasiblity of recycling sewage dredged soils as fine affrefate. This paper describes the feasibility of recycling sewage dredged soils as fine aggregate. The specific gravity of the dredged soils was smaller than that of sand due to the effect of dredged sludge. However, the grain size distribution of the dredged soils is relative well graded, and the results of the heavy metal concentration from the leaching test of the dredged soils was significantly lower than the requirements of the allowable criteria. Therefore, the effect of recycling of dredged soils on environment the as fine aggregate was negligible. Also, the specific gravity of the dredged and washed soils was similar to that of sand, and the dredged and washed soils for the most part showed lower heavy metal leaching characteristics than those of dredged soils, Also, the results of the study for evaluation the recycling feasibility of dredged and washed soils as fine affrefate. The organic impurity content of the dredged and washed soils was lower than the requirements of the Korean industrial Standards, and the mortar compressive strength using the washdredged soils also met those of the Korean industrial Standards. And, the strengths of the dredged and washed soils were over 95% of those of the NaOH-treated samples. Therefore, it is expected that the dredged soils will be able to be an alternative for fine aggregate.

• 한국철도학회논문집
• /
• 제5권2호
• /
• pp.61-69
• /
• 2002

Recycling of dredged soils as construction materials is experimently discussed in this paper. The strength of light-weighted soils(LWS) consisting of expanded polystyrene(EPS), dredged soils and cement is characterized by uniaxial and triaxial compression tests with varying initial water contents of dredged soils, the EPS volume and cement contents, and expanded ratio of EPS. Test results show that the strength of light-weighted soils increases with adding cement contents, whereas the strength increases with decreasing initial water contents of dredged soils and expanded ratio of EPS. It was, however, found that increasing the EPS volume makes a lower the strength of light-weighted soils.

• 한국지반공학회논문집
• /
• 제19권4호
• /
• pp.257-264
• /
• 2003

자연상태의 퇴적물과 준설과정을 거친 준설토 사이에는 퇴적물이 안정상태에서 교란되어 다시 침강되기 때문에 체적변화가 발생한다. 또한, 부유물질의 침강을 촉진하기 위하여 투입되는 응결제 및 응집제의 영향에 따라 준설토의 체적변화에 다양한 특징을 보인다. 본 논문에서는 준설시 약품투입량에 따른 준설토의 체적변화 특성분석에 중점을 두고 연구를 수행하였다. 퇴적물 준설시료는 동해안에 위치한 석호의 준설토를 이용하였으며, 함니율 변화, 응집제 및 응결제 투입량 변화에 따른 준설토의 체적변화는 실내 모형 토조실험을 통하여 정량적으로 분석하였다. 적정 응집제 및 응결제 투입량은 체적변화가 가장 작은 값을 기준으로 결정하였다. 실험결과를 분석한 내용은 준설토의 체적은 평균 1.69배 증가하는 것으로 파악되었다. 그리고 약품을 투입한 경우 함니율 증가에 따라 체적변화율이 증가하는 경향을 보이고 있으나 증가량은 미미한 것으로 파악되었다.

• 한국지반환경공학회 논문집
• /
• 제14권2호
• /
• pp.31-41
• /
• 2013

서해안 지역의 준설토는 실트 또는 세립모래 성분이 많은 특성으로 인해 성토재로 직접 사용되는 사례가 증가하고 있으나, 준설토를 성토재로써 활용하는 연구에 대해서는 미흡하다. 이에 본 연구에서는 서해안 지역의 준설토를 성토재료의 활용성을 확인 하고자 하였다. 우선적으로 피에조콘 관입시험을 통해서 준설 지반의 구성성분을 확인함으로써 성토재의 활용 가능성을 우선적으로 확인하였다. 준설토에 대한 침강 및 자중압밀시험을 시행하여 준설토의 특성을 평가하는 동시에 침강 및 자중압밀이 완료된 시료에 대해서 다짐시험 및 직접전단시험을 시행함으로써 준설토의 준설완료 시점의 특성을 확인하였다. 아울러 침강 및 자중압밀이 완료 된 시료를 자연배수시킴으로써 시간이 경과됨에 따라서 준설토가 보이는 역학적 특성을 확인하고자 하였다. 실트, 실트질 모래 및 모래성분이 다량 포함되고 있는 서해안 지역의 준설토는 자연배수 시간이 경과함에 따라서 단위중량과 전단강도가 증가되는 특성 을 보이는 것으로 평가되었다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2005년도 춘계 학술발표회 논문집
• /
• pp.1167-1174
• /
• 2005

This paper describes on the volume change of Sewage Dredged Soils by using laboratory test and volumetric change test. The tremendous change of Moisture Content occured in the Sewage Dredged Soils during the Elapsed Time. The Unit Weight increases during the normally shrinkage limit void ratio and then the unit weight decrease. A volume of Sewage Dredged Soils according to the moisture content is a difference maximum 2.5 times. And there is the difference 3.5 times according to the change of unit weight. Therefore, the moisture content and unit weight computation are very important for the computation on the volume of Sewage Drdeged Soils.

• 한국지반환경공학회 논문집
• /
• 제16권9호
• /
• pp.5-12
• /
• 2015

해양정화사업으로 많은 양의 준설토가 발생하고 있는데 이 중 입자가 작은 준설세립토는 폐기물로 버려지고 있는 실정이다. 일반매립재와 성토재 및 호안블록, 콘크리트 블록으로서의 사용성을 확인하기 위하여 관련 기준들을 고찰하였으며, 준설세립토에 대한 지반공학적 물성시험과 알칼리 활성화 반응을 통하여 성토재, 호안블록 및 콘크리트 블록으로서의 사용성을 분석하였다. 준설토 중 준설모래는 성토재로서 사용이 가능하였으며, 준설세립토 만으로 일반 매립제로 사용이 가능하였다. 그리고 준설세립토와 준설모래를 혼합하여 성토재로 사용할 수 있었다. 고로수재 슬래그와의 알칼리 활성화 반응을 통하여 생성된 재료는 호안블록 및 콘크리트 블록 등으로 사용할 수 있었다.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제18권1호
• /
• pp.57-66
• /
• 2013

Although the quantity of dredged soils has increased owing to recent new harbor construction, sea course management, polluted sediment dredging, and four-river project, the reuse or recycling of those dredged soils has not done properly in Korea. To develop measures to utilize them in various ways for reuse or recycling, the biophysicochemical properties of dredged soils and sediment were assessed in this study. Samples were classified according to their sources-river and sea-by location, and as dredged soil and sediment depending on storage time. The results showed that dredged materials from the sea have high clay content and can be used for making bricks, tiles, and lightweight backfill materials, while dredged materials from the river have high sand content and can be used in sand aggregates. Separation procedures, depending on the intended application, should be carried out because all dredged materials are poorly sorted. All dredged soils and sediments have high salinity, and hence, salts should be removed before use for cultivation. Since dredged materials from the sea have adequate concentrations of nutrients, except phosphate, they can be used for creating and restoring coastal habitats without carrying out any additional removal processes. The high overall microbial activities in dredged materials from the river suggested that active degradation of organic matter, circulation of nutrients, and provision of nutrients may occur if these dredged materials are used for cultivation purpose.

• 한국지반환경공학회 논문집
• /
• 제5권4호
• /
• pp.5-11
• /
• 2004

오랜 기간동안 자연 상태로 퇴적되어 있는 퇴적토를 펌프준설의 방법으로 준설할 때, 안정상태의 퇴적토는 준설되는 과정에서 교란되어 침강을 촉진시키는 응결제 및 응집제를 투입하더라도 자연 상태의 퇴적토와 준설토 사이에는 필연적으로 체적변화가 발생한다. 본 연구는 동해안 속초에 위치한 석호인 영랑호의 준설토를 대상으로 실내실험을 하였으며, 준설토의 함니율 변화, 응집제 및 응결제 투입량 변화에 따른 체적변화율을 정량적으로 분석하였다. 실험결과 최적 약품첨가의 경우 준설토의 체적변화율은 평균 1.69배 증가하는 것으로 파악되었다.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
• /
• pp.606-611
• /
• 1999

Recently , the hydraulic fill method is commonly used in many reclamation projects due to lack of fill materialss. The method of hydraulic fill i recalmation is executed by transporting the mixture of water -soil particles into a relcaimed land through dredging pipes, then the dredged soil particels settle down in thewater orflow over an out flow weir with the water. The amount of the volume reductions of dredged soil is considered the sum of the overall settlement by descication shrinkage and self-weigth consolidation and the loss of soil particles flow over a weir. In the present study, hydrometer analysis was performed with the soil samples obtained bofore and after dredging to estimate the amount of soil particles residual at reclaimed area and the loss of soil particles , then it was suggested the method of determining the loss ratio of dredged soils from the tests results. The hydrometer analysis of in-situ soil samples showed that the loss ratio of dredged soils is lowest at the nearest point to dredge pipe and highest at the nearest point of out flow weir.

• 한국조경학회지
• /
• 제32권6호
• /
• pp.95-102
• /
• 2005

This study was carried out to find out the heavy metal contents and the physico-chemical properties for the improvement of dredged soils which widely exist in lowlands of Korea. At first all the average heavy metal contents were close to background level and were much lower than concern level of the Soil Environment Conservation Act of Korea. And the results of physical analyses of soils showed on the average $2.46\~2.74 Mg/m^3$ in Particle density, $0.45\~2.45 kg/kg$ in soil water contents, $0.34\~0.90 Mg/m^3$ in bulk density, $0.67\~0.87m^3/m^3$ in porosity, $2.18\times10^{-5}\~1.20\times10^{-8} m/s$ in saturated hydraulic conductivity, R0.12\~0.65 m^3/m^3$ in available water contents. Finally the results of chemical analyses of soils showed on the average $6.5\~8.2\;in\; pH,\;5\~48 g/kg\;in\; OM,\;0.48\~4.51g/kg\;in\;T-N,\;19\~25mg/kg$ in available phosphate, $0.28\~11.80 dS/m\;in\;EC,\;8.7\~38.1cmol/kg$ in CEC, respectively Accordingly, the physicochemical properties of soils ought to be analyzed accurately before dredging for effective using of dredged soils. And it will be more effective, if the dredged soils are used with proper balance among each content of components with consideration to the physicochemical properties of common soils.