• 연구논문집
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• 통권28호
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• pp.161-172
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• 1998

철강재생 공장내의 전기 용융로에서 발생된 먼지중의 아연 성분을 재생하는 공정인 Waelz 공정에서는 매년 많은 양의 slag가 발생되어진다. 표면이 유리질성인 이 slag의 물리적 특성이 매우 우수하며, 건축 현장에서 골재(모래나 자갈)의 대체물질로 사용 가능한 만큼 높은 안정성을 지니고 있다. 유럽공동체 과 제인 본 연구는 여러 종류의 slag에 대한 용출특성, 물리-화학적 특성조사 및 광물학적 특성 연구에 주안점을 두었다. 용출실험으로는 법규실험과 slag의 재사용 시나리오와 관련된 여러 주요인자에 대한 영향(pH, 산환원 전위, 용매의 화학적특성, L/S비 등)에 대하여 조사되어졌다.

• 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.

• Advances in concrete construction
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• 제7권4호
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• pp.231-239
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• 2019

The present study deals with the development of metakaolin-based geopolymer concrete (GPC) and thereafter studying the effects of adding ultra-fine slag on its mechanical and permeability characteristics. The mechanical characteristics including compressive, split tensile, flexural strengths and elastic modulus were studied. In addition, permeability characteristics including water absorption, porosity, sorptivity and chloride permeability were studied up to 90 days. The results showed the effective utilization of metakaolin for the development of elevated temperature cured geopolymer concrete having high 3-day compressive strength of 42.6 MPa. The addition of ultra-fine slag up to 15%, as partial replacement of metakaolin resulted in an increase in strength characteristics. Similar improvement in durability properties was also observed with the inclusion of ultra-fine slag up to 15%. Beyond this optimum content of 15%, further increase in ultra-fine slag content affected the mechanical as well as permeability parameters in a negative way. In addition, the relationship between various properties of GPC was also derived.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 봄 학술발표회 논문집
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• pp.124-128
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• 1997

In order tohave a betterunderstanding of thefavorable effect ofground granulated blast-furnace slag and fly ash, slump loss, temperature risingand compressive strength of concrete were investigated into diffrent conditions. When slag was mixed with ordinary portland cement as30%, slump loss gotto some 18% at 60min, maximum temperatureto some $43^{\cire}C$ at 180min, compressive strength similar to that of ordinary portland concrete at 28 days. Therefore it wasnoted thatslump loss andmaximum teaperaturerising of concrete were very reduced according to ground granulated blast-furnace slag and fly ash mixed with ordinary portland cement.

• 공학기술논문지
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• 제11권4호
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• pp.295-301
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• 2018

In this study, freezing-thawing resistance of concrete using steel slag as coarse aggregate(steel slag concrete) from Gwangyang Iron Co. was estimated to offer basic data for utilization of much more steel slag. Freezing-thawing test of concrete using crushed stone as coarse aggregate(crushed stone concrete) whose compressive strength and air contents are as close as possible to those of the steel slag concrete was performed. Because they are main two factors that affect of freezing-thawing resistance. The test was carried out up to 400 cycles according to KS F 2456. The compressive strength and weight of two concretes were measured and compared. As a result, the freezing-thawing resistance of steel slag concrete curing in water was almost the same with that of crushed stone concrete. But the resistance of steel slag concrete curing in air dry condition was weaker than that of crushed stone concrete. Also, the steel slag concrete which has more than 60% of W/C ratio showed much more surface degradation when compared to crushed stone concrete.

• Advances in concrete construction
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• 제9권6호
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• pp.589-596
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• 2020

In an effort to find alternate, environment friendly and sustainable building materials, the scope of possible utilization of iron slag (I-sand), generated as a by-product in iron and steel industries, as fine aggregates in reinforced cement concrete (RCC) made with manufactured sand (M-sand) is examined in this manuscript. Systematic investigations of the physical, mechanical, microstructural and durability properties of I-sand in comparison with RCC made with M-sand have been carried out on various mix designs prepared by the partial/full replacement of I-sand in M-sand. The experimental results clearly indicate the possibility of utilizing iron slag for preparing RCC in constructions without compromising on the property of concrete, durability and performance. This provides an alternate possibility for the effective utilization of industrial waste, which is normally disposed by delivering to landfills, in building materials which can reduce the adverse environmental effects caused by indiscriminate sand mining being carried out to meet the growing demands from construction industry and also provide an economically viable alternative by reducing the cost of concrete production.

• 한국토양비료학회지
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• 제18권1호
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• pp.67-71
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• 1985

제철광재(製鐵鑛滓)로 부생(副生)되는 급랭광재(急冷鑛滓)를 규산질비료(珪酸質肥料) 자원(資源)으로서의 활용성(活用性)을 검토(檢討)해보고저 시판(市販) 규산질비료(珪酸質肥料)를 대조(對照)로 입도수준별(粒度水準別)로 규산함량(珪酸含量)이 낮은 사양토(砂壤土)를 공시(供試)하여 pot시험(試驗)으로 비효(肥效)를 구명(究明)하였다. 수도수량(水稻收量)은 급랭광재(急冷鑛滓)가 시판(市販) 서랭광재(徐冷鑛滓)에 비(比)하여 증수(增收)되었으며 이는 식물체(植物體) 규산함량(珪酸含量)이 높은 것과 일치(一致)되었다. 식물체중(植物體中) 규산함량(珪酸含量)이 높은것은 급랭광재(急冷鑛滓)에서 규산(珪酸)의 공급력(供給力)이 신속(迅速)한 때문이며, 토양중(土壤中) 규산함량(珪酸含量)은 서랭광재(徐冷鑛滓)에서 높았으며 이는 서랭광재(徐冷鑛滓)에서 규산용출(珪酸溶出)이 지속(持續)되어 토양(土壤)에 많이 잔존(殘存)해 있는 것으로 판단(判斷)되었다. 이와같은 결과(結果)로 보아 급랭광재(急冷鑛滓)는 규산질비료(珪酸質肥料) 자원(資源)으로 활용(活用)이 가능(可能)할 것이다.

• 한국건설순환자원학회논문집
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• 제9권2호
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• pp.152-160
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• 2021

본 연구에서는 건설 산업의 고도화에 따라 대량 발생하는 철강 슬래그 및 페로니켈슬래그의 활용을 위해 모르타르 배합에 혼입하여 실험적 연구를 진행하였다. 물의 흡수율이 낮은 BOF와 표면이 매끄러운 성질을 가진 FNS를 시멘트에 치환하면, 희석효과(dilution effect) 작용으로 플로 값과 응결시간이 증가하였다. 다만, BOF를 표준사 대비 10% 초과하여 혼입할 경우 재료 분리 현상(segregation)이 발생하였고, 이에 다량의 혼입 배합은 실험에서 제외하였다. BOF 잔골재와 FNS 혼입 모르타르는 응결 지연으로 인한 수화열 감소로 종결이 완료된 후 길이변화가 발생하지 않았다. BOF 잔골재를 혼입한 모르타르의 압축강도는 표준사와 시멘트만을 혼입한 모르타르 강도 보다 감소되었지만 FNS와 함께 혼입한 배합의 경우 양생 일이 증가함에 따라 압축강도도 증가하였다. BOF 잔골재를 혼입한 B10F0 및 B10F20 모르타르에서는 수화가 진행되어 BOF 원재료 XRD에서 관찰할 수 있었던 larnite, mayenite, wuestite 클링커는 거의 관찰되지 않았지만, FNS의 낮은 수화 반응성으로 FNS의 클링커는 관찰되었다. 주사전자현미경 분석 결과 수화결정체로 존재하지 않고 수화가 진행 중인 FNS를 확인할 수 있었으며 이를 통해 FNS의 잠재수경성을 확인하였다. FNS를 첨가하지 않은 시편의 경우 BOF 골재가 겔이나 침상결정이 아닌 전체가 괴상으로 존재하였으며, 인산화칼슘(calcium phosphate) 형성을 확인하였다. 다만, 전로슬래그를 혼입할 경우 내부 공극은 밀실함이 다소 저하되었으며, 추후 BOF를 잔골재 또는 건설 재료로 활용할 경우 적정 배합비 선정이 필요할 것으로 판단된다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.514-519
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• 2001

Converter has been slag produced 10 million tons per year in Japan. It is a steel making by product produced in the same way as the blast-furnace slag. Though blast-furnace slag is being used effectively as a concrete admixture, the converter stag has never been used effectively because of the expansion action of contained free lime and iron oxide. This is an important environmental problem in the steel industry. Beta-2CaOSiO$_2$(beta-C$_2$S) is contained 40 percent in converter slag, therefore it is very promising as a concrete admixture. We proposed an accelerated aging processes capable of stabilizing the converter slag in a short time. The converter slag is dipped into alkali aqueous solution after heating at low temperature. It was subsequently ground to a grain size of 75 ${\mu}{\textrm}{m}$ , inner 30 percent of OPC. The properties of mortar and concrete using the blended cement were determined. As a result, it has become apparent that the expansion was reduced and long term compressive strength was increased while that at early ages was not so remarkable. The hydration exotherm rate was lower than that of the OPC.

• 대한토목학회논문집
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• 제9권2호
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• pp.55-61
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• 1989

본 연구에서는 전기로슬래그를 잔골재로 사용하기 위한 기초단계로서 전기로슬래그의 화학성분, 조성광물 및 물리적성질에 대하여 고찰하였으며, 전기로슬래그의 팽창기구(膨脹機構), 안정화방안(安定化方案)에 대하여 검토하였다. 그리고 안정화된 전기로슬래그를 잔골재의 일부와 대체한 콘크리트의 기초적 성질을 알아보기 위하여 실시한 실험결과에 대해서도 고찰하였다.