• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.66-67
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• 2013

Replacing a large amount of ground granulated blast furnace slag is limited because early age strength is low due to latent hydraulic property despite excellence of long-term strength. This study aimed to examine produceableness of high-activated ground granulated blast furnace slag using slag by-product from steel process. As experimental variable, the properties of strength development were analyzed by setting fineness and replacement ratio of slag by-product, curing conditions, and W/B. The results of study showed that high-activated ground granulated blast furnace slag using slag by-product as an activator improve the compressive strength of mortar. It is expected to be used as binder for secondary product of concrete considering curing and mixing conditions because high-activated ground granulated blast furnace slag can be hydrated by itself.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.226-227
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• 2021

Various attempts are being made to reduce carbon emissions through recycling of industrial by-products in the construction materials industry to reduce carbon emissions, and cement substitutes such as blast furnace slag and fly ash are widely used. Although it is suggested that the use of industrial by-product aggregate is possible in 'Aggregate', the use case of industrial by-product aggregate is very rare in the actual field. In this study, as an industrial by-product, fine slag aggregate is used as fine aggregate among aggregates that can be used as aggregate for concrete, and coarse aggregate is used as a substitute for natural aggregate. WWe tried to suggest various ways to expand the use of industrial by-product aggregates.

• 한국건축시공학회지
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• 제14권1호
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• pp.37-44
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• 2014

건설산업에서는 탄산가스 저감을 위해 산업부산물을 다량 활용하는 기술개발을 위한 연구가 이루어지고 있다. 산업부산물 중 특히 고로슬래그 미분말은 잠재수경성에 기인하여 장기강도는 우수하나 초기강도가 낮기 때문에 많은 양을 대체하는데 한계가 있다. 이에 본 연구에서는 철강공정 중 용선예비처리 공정에서 발생하는 슬래그부산물을 활용하여 고활성 고로슬래그 미분말을 시험 제조후 고활성 고로슬래그 미분말의 모르타르 압축강도 강도발현 특성을 검토하였다. 또한, 고활성 고로슬래그 미분말 단독으로도 경화가 가능한 특징을 고려해서 2차 콘크리트 제품용 결합재로서 활용 가능성을 검토하고자 배합조건에 따른 콘크리트 제조 및 압축강도 발현특성을 검토하였다. 실험변수로써 슬래그부산물의 분말도, 치환율, 양생조건 및 W/B를 설정하였다. 그 결과 슬래그부산물을 자극제로 활용한 고활성 고로슬래그 미분말 모르타르의 압축강도 향상을 확인하였으며 고활성 고로슬래그 미분말이 단독으로도 경화가 가능하기 때문에 양생 및 배합조건을 고려하면 고활성 고로슬래그 미분말을 콘크리트 2차 제품용 결합재로서 활용 가능할 것으로 판단된다.

• Advances in environmental research
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• 제8권1호
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• pp.55-69
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• 2019

The generation of ferrous slag, an industrial by-product from the iron ore industry, results in serious environmental problems. The chemical compositions indicate 30-34% SiO₂, 30-34% CaO, 18-22% Al₂O₃ and 0.5-0.6% Fe₂O₃. The specific gravity, moisture content and pH are in the range of 1.3-1.65, 9.1-10% and 8.5-9.0 respectively. The major part of the slag is composed of sand-size particles. The problems of disposal of slag could be minimized by considering its use in various environmental engineering applications providing additional value to the by-product. This paper mainly focuses on the potential utilization and valorisation of ferrous slag in both water and wastewater treatments. It is effective for the treatment of water and wastewater containing nutrients, heavy metals and polluted river/stormwater.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.99-104
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• 2001

Slag product has the possibility as alternative aggregate and sand under the circumstance of natural resource shortage. Copper slag is the by-product produced in process of copper industry. Recycling the slag in construction industry could give positive effects on the environmental preservation. This study presents that the fundamental properties of high strength concrete which used copper slag as alternative sand. Testing factors are concrete's slump, bleeding, air contents and compressive strength. The results of this study are as follows. (1) Mixing of W/C 30%, substitution rate 25% shows the best slump. As substitution rates are going up, concrete slump is uprising and air contents are downsizing. (2) The bleeding of concrete becomes more serious as substitution rates are going up. (3) The best compressive strength of copper slag concrete is achieved in mixing of W/C 30%, substitution rate 25%.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.48-53
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• 2003

The steel slag, a by-product which is produced on the process of manufacturing steel by refining pig iron is mainly used as road materials after aging it. It is necessary to age steel slag for long time in air because the reaction with water and free-CaO in steel slag could make the volume expanded. Due to this reason it prevents steel slag from being used as aggregate of concrete. But steel slag used in this study is controled by a air-jet method which rapidly cools substance melted at a high temperature. Rapid cooling prevents from generating of free-CaO in steel slag. In this study, it was investigated that steel slag manufactured by air-jet method affects on concrete in the freezing and thawing. As results of this study, concrete mixed with steel slag was worse in the freezing and thawing than concrete mixed with sand in spite of using air entraining agent. To obtain durability of concrete in the freezing and thawing, it is desirable to mix 50% of steel slag in concrete per unit weight of volume.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.217-222
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• 2003

The steel slag, a by-product which is produced during the manufacture of steel by refining pig iron, is mainly used as road materials after aging it. It is necessary to age steel slag for long time in air because the reaction with water and free-CaO in steel slag could make the expansion of volume. This problem prevents steel slag from being used as aggregate for concrete. But steel slag used in this study was controled by an air-jet method which rapidly cools substance melted at a high temperature. Rapid cooling prevents from generation of free-CaO in steel slag. In this study, properties of steel slag manufactured by air-jet method and mortar used it were investigated. As results of this study, free-CaO contents were controled under 1%. Mortar used this steel slag demanded to lower water contents, higher compressive strength and lower drying shrinkage than the basic mortar in the same condition.

• 한국지반공학회논문집
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• 제18권5호
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• pp.195-207
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• 2002

동제련 과정에서 부산되는 동슬래그는 국내에서 연간 70여만톤에 이르나, 그 활용분야가 제한되어 사용량이 미약하여 그 처리방안이 시급히 요청되고 있는 실정이다. 이에 본 연구는 동슬래그의 입도가 0.15~5mm의 조립상태로 분포하여 환경적으로도 안정된 유리질이라는 점에 착안하여 연약지반개량공법 중의 하나인 모래다짐말뚝의 모래대체재로서의 활용방안을 모색하였다. 실내 물리.역학시험 및 모형토조시험에 의한 동슬래그의 지반공학적 재료특성을 파악하고 현장시험시공을 통해 동슬래그의 모래다짐말뚝의 모래대체재로서의 현장 적용 가능성을 일반모래와 비교.검토하였다. 그 결과 동슬래그의 재료특성이 양호하고 지지력, 침하저감효과 그리고 주변지반 개량효과면에서 동슬래그 또는 동슬래 그다짐말뚝이 우수한 것으로 나타나, 모래다짐말뚝의 모래대체재로 동슬래그를 적용할 경우 천연골재의 고갈에 따른 대체골재원으로서 산업부산물의 재활용이라는 측면에서 경제적.환경적으로 활용가치가 높으리라 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 봄 학술발표회 논문집
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• pp.623-630
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• 2000

In this study, it was to investigate the possibility to use the converts slag, by product in producing steel as a substitute material with sand that is used fur a civil construction materials, in developing techniques to use converts slag to improve soft clay ground. To do this, it was investigated the physical and mechanical properties of the converts slag as a civil construction material. For this, cylindrical cell consolidation with a single vertical drains and large scale soil box test were performed. Through large scale soil box test, the applicability of the converts slag to the present vertical drain techniques which is dependent on sand and plastic drains was studied. As a result of that, it was found that the shape of inserted drains was maintained after completing a consolidation process of a soft clay with slag drains. In addition, we could find that the slag drains showed the similar results with sand drains in soft clay by analyzing the effect of acceleration of consolidation.

• 한국세라믹학회지
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• 제36권7호
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• pp.725-733
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• 1999

It is a fundamental experiment to use blast-furnace slag in solidification/stabilization process. The compressive strength and leaching test of Pb and Cr doped samples were evaluated and the effects of heavy-metal ions on the hydration of slag was investigated. Sodium silicates(5wt%) was added as alkali-activator and the effects of replacing a part of slag with flyash or gypsum was also discussed. Pb ion was solidified by encapsulation of matrix. In of slag${\pm}$gypsum binder microstructure was densified by accelerating to form AFt/AFm phase and compressive strength was improved resulting in reducing leaching amount of Pb ion. Cr ion was solidified by substituting with Al ion in aluminate product. Slag+fly ash binder improved compressive strength and decreased leaching amount of Cr ion.