• Environmental Engineering Research
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• 제9권4호
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• pp.175-183
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• 2004

• Environmental Engineering Research
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• 제9권2호
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• pp.66-74
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• 2004

• Environmental Engineering Research
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• 제9권3호
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• pp.103-112
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• 2004

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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• pp.116-117
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• 2014

This study is to environmental safety assessment of ground solidification materials using industrial by-products. also, physical and chemical properties were investigated. as a result, compared to conventional cement the survival rates are capable, was judged to be possible utilizing of ECO-friendly ground solidification materials.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.731-738
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• 2002

Recently, as large constructions on the coast are performed frequently, surface layer stabilization method which Is one of the improvement methods for dredged soft clay has been applied. However, there have been few studies about the surface layer stabilization method. The purpose of this study is to clarify characteristics of ultra-soft marine clay and hardening agent. Also, optimal mixture ratio of hardening agent was verified through the laboratory tests such as statistical analysis and pilot tests. Laboratory tests were performed with proper hardening agent and test soil and standard mixing tables of hardening agent were determined according to ground conditions through statistical analysis. Also, applicability of surface layer stabilization method to field was verified by pilot tests. From the results of the tests, it was found that hardening agent materials such as cement, slag, fly-ash, inorganic salts, arwin, gypsum etc. affect on the appearing compressive strength. It was defined optimal mixture ratio which satisfies the required compressive strength from the statistical analysis. Also, It was compared the effect of ground improvement by cements and hardening agents through the pilot tests. This study will serve as data for design or construction criteria of stabilization of surface layer on ultra-soft marine clay.

• 한국지반공학회논문집
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• 제27권5호
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• pp.5-15
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• 2011

최근 연안지역에서의 대형건설공사 증가로 인해 대규모의 연약지반처리 공사가 많이 이루어지고 있다. 이로 인해, 흙에 시멘트나 석회를 첨가하여 안정성과 내구성을 증대시키는 고화안정처리공법이 연약지반 현장의 표층처리에 빈번히 사용되고 있다. 고소성, 고압축성의 초연약 점성토를 대상으로 한 고화처리 연구는 그 동안 많이 이루어져 왔으나 상대적으로 낮은 소성성과 압축성을 가진 실트질 점성토를 대상으로 한 고화처리 연구는 찾아보기 힘들다. 따라서 본 연구에서는 송도 지역의 저소성 실트질 점성토를 배합 함수비, 개량재 배합비, 양생 기간을 변화시키며 시멘트와 생석회로 고화처리하고, 일축압축 시험 및 평판재하시험을 통하여 강도 특성을 파악하였다. 일축 압축 시험과 평판 재하 시험으로부터 상당히 일치하는 강도 특성 결과를 얻었으며, 이를 바탕으로 개량토를 매립지 표토층으로 이용하였을 경우 건설 장비의 주행성을 평가하였다. 이상의 결과로부터 송도 지역 점성토를 고화 처리하는 최적의 조건을 얻을 수 있었다.

• 한국지반환경공학회 논문집
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• 제3권2호
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• pp.23-33
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• 2002

산업부산물인 제지회의 연약지반 표층고화처리 등을 목적으로 하는 지반개량재로써의 활용가능성을 모색하였다. 100% 제지회와 강도증진 등을 위한 2차 첨가재로써 시멘트 및 소량의 황산염(sulfate)성분을 첨가한 각각의 제지회 혼합토에 대하여 일축압축강도, 전자주사현미경관찰, pH분석 등을 수행하였다. 모든 경우에 있어서 양생이 진행됨에 따라서, 혼합비의 증가에 따라서, 혼합토의 강도는 증가하나 혼합초기에 거의 대부분의 강도가 발현되며 강도증가 효율면에서는 흙과의 혼합비가 9% 내외에서 최대 효율을 나타낸다. 제지회만을 사용하는 경우에 비하여 제지회에 함유된 시멘트량이 10~30%까지는 약 2배의 강도가 증가하며 시멘트 함유량이 40%일 경우에는 5~8배 정도 강도가 증가한다. 포졸란 반응 및 수화물의 생성에 유리한 환경을 나타내는 조건은 시멘트 함유량이 20%이상의 제지회를 7%이상 흙과 혼합했을 경우이다. 제지회만을 사용하는 경우에는 수화반응 또는 포졸란 반응이 활발하지 못하며, 흙과의 혼합비가 10% 이상에서 활발하게 유산석회수화물이 생성된다.

• Environmental Engineering Research
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• 제21권1호
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• pp.15-21
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• 2016

Magnesium potassium phosphate cement (MKPC) is an effective agent for solidification/stabilization (S/S) technology. To further explore the mechanism of the S/S by MKPC, two kinds of Cd including $Cd(NO_3)_2$ solution (L-Cd) and municipal solid waste incineration fly ash (MSWI FA) adsorbed Cd (S-Cd), were used to compare the effects of the form of heavy metal on S/S. The results showed that all the MKPC pastes had a high unconfined compressive strength (UCS) above 11 MPa. For L-Cd pastes, Cd leaching concentration increased with the increase of Cd content, and decreased with the increase of curing time. With the percentage of MSWI FA below 20%, S-Cd pastes exhibited similar Cd leaching concentrations as those of L-Cd pastes, while when the content of MSWI FA come up to 30%, the Cd leaching concentration increased significantly. To meet the standard GB5085.3-2007, the highest addition of S-Cd was 30% MSWI FA (6% Cd contained), with the Cd leaching concentration of 0.817 mg/L. The S/S of L-Cd is mainly due to chemical fixation, and the hydration compound of Cd was $NaCdPO_4$, while the S/S of S-Cd is due to physical encapsulation, which is dependent on the pore/crack size and porosity of the MKPC pastes.

• Geomechanics and Engineering
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• 제7권3호
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• pp.247-261
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• 2014

Analytical and numerical modeling of soft or problematic soils stabilized with lime and cement require a number of soil parameters which are usually obtained from expensive and time-consuming laboratory experiments. The high shear strength of lime and cement stabilized soils make it extremely difficult to obtain high quality laboratory data in some cases. In this study, an alternative method is proposed, which uses the unconfined compressive strength and estimating functions available in literature to evaluate the shear strength parameters of the treated materials. The estimated properties were applied in finite element model to determine which estimating function is more appropriate for lime and cement treated granular soils. The results show that at the mid-range strength of the stabilized soils, most of applied functions have a good compatibility with laboratory conditions. However, application of some functions at lower or higher strengths would lead to underestimation or overestimation of the unconfined compressive strength.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.133-134
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• 2005