• Journal of the Korea Institute of Building Construction
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• v.18 no.5
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• pp.419-427
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• 2018

The purpose of this study is to recycle steel slag generated from the iron producing process and to use steel slag as a construction material which is currently landfilled Steel slag is subjected to aging treatment due to the problem of expansion and collapse when it reacts with water. The Slag Atomizing Technology (SAT) method developed to solve these problems of expanding collapse of steel slag. In this study, experimental study on the emergency repair mortar using the reducing slag, electric arc furnace slag and silicon manganese slag manufactured by the SAT method is Reduced slag was shown an accelerated hydration when it was replaced with rapidly-setting cement, and the rate of substitution was equivalent to 15%. It is shown that the electric furnace oxide slag is equivalent to 100% of the natural aggregate, and it can be replaced by 15-30% when the silicon manganic slag is substituted for the electric furnace oxide slag. With the above formulation, it was possible to design the rapidly repair mortar for road use. These recycling slags can contribute on achieving sustainability of construction industry by reducing the use of cement and natural aggregates and by reducing the generation of carbon dioxide and recycling waste slag.

• Magazine of the Korea Concrete Institute
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• v.13 no.1
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• pp.66-72
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• 2001

지구 온난화, 천연 자원의 고갈, 처분 장소의 핍박 등 환경문제가 사회적인 문제로 대두되고 있다. 특히 건설분야에서 천연산 골재의 부족은 매우 심각한 상황에 있으며, 이를 해결하기 위해 재생골재의 재활용 등 많은 연구가 이루어져 1999년도에는 아스팔트 콘크리트용 재생골재(KS F 2572), 콘크리트용 재생골재(KS F 2573), 도로기층용 재생골재(KS F 2574)에 대한 규격을 제정함으로써 실용화의 단계에까지 이르고 있다 그러나 제철소의 제강 및 정련 공정상에서 발생하는 철강슬래그를 콘크리트용 골재로서 활용하기 위한 국내의 연구는 몇몇 연구자들에 의해서만 이루어지고 있어 초기 단계에 있다고 할 수 있다. 이에 본고에서는 콘크리트용 천연산 골재의 대체 재료로서 각종 철강슬래그의 적극적인 재활용을 도모하기 위해 최근 슬래그를 골재로서 사용하기 위해서 연구한 결과 및 실례를 수록한 문헌을 조사 검토하여 슬래그 골재의 특성에 대하여 소개하고자 한다.

• Resources Recycling
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• v.5 no.3
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• pp.9-16
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• 1996

The purpose of ths rescarch was to detcrmine a po\sihle application of the slag thc sliigs of iron-and steelmaking as afiller at asphalt concrete. The slags were crnshed for bcller recycling of lhree typical slags as ascon tiller. and thcn thcphysical and chemical properlies welt examincd The mechanical properliea of asphall cnncrete after filling with slagpowders under 200 mesh us fillers wcre tested to fulfill thc Korean Standnrds. Optimum tempcrafure of mixing the slagswith asphalt wils 140-160$^{\circ}$C. The density, the stabilily. gap ratio and the samration degree were 2.37 glcm', 810 kg. 3.4"'||'&'||'and 80.4%, respectively.tively.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.101-102
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• 2013

시멘트 및 건설산업은 그 제조과정에서 다량의 이산화탄소를 배출하기 때문에 지구온난화 문제를 가속화시키고 있는 것으로 알려져 있다. 따라서 이러한 시멘트를 대체할 수 있는 재료 개발에 많은 연구가 이루어지고 있으며, 철강산업 부산물인 고로슬래그 미분말은 그 중 하나의 재료라 할 수 있다. 고로슬래그 미분말은 물과 직접 반응하지 않으나 알칼리 환경하에서는 물과 반응하여 CSH 수화물을 생성하게 된다. 본 연구에서는 알칼리 자극제를 첨가한 경우의 무시멘트 경화체에 대한 강도 및 수화 특성에 대하여 분석하고자 하였다.

• Journal of the Korea Concrete Institute
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• v.25 no.1
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• pp.115-123
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• 2013

The steel industry, a representative industry that significantly consumes raw materials and energy, produces steel as well as a large amount of by-product steel slag through the production process. The vast habitat foundation of marine life has been destroyed due to recent reckless marine development and environment pollution, resulting in intensification of the decline of marine resources, and a solution to this issue is imperative. In order to propose a method to recycle large amounts of by-product slag into a material that can serve as an alternative to natural aggregate, the engineering properties and applicability for each mixing factor of environment friendly porous concrete as a material for the composition of marine ranches were evaluated in this study. The test results for percentage of voids per mixing ratio revealed that the margin of error for all conditions was within 2.5%. The compressive strength test results showed that the most outstanding environmental friendly porous concrete can be manufactured when mixing 30% slag aggregate and 10% specially treated granular fertilizer for the optimum volume fraction. As concrete for marine applications, the best seawater resistance was obtained with mixing conditions for high compression strength. An assessment of the ability to provide a marine life habitat foundation of environmentally friendly porous concrete showed that a greater percentage of voids facilitated implantation and inhabitation of marine life, and the mixing of specially treated granular fertilizer led to active initial implantation and activation of inhabitation. The evaluation of harmfulness to marine life depending on the mixture of slag aggregate and specially treated granular fertilizer revealed that the stability of fish is secured.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.1
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• pp.1-7
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• 2020

As of 2018, Steel slag was generated approximately 24.23 million tons. Howeve, except blast furnace slag, steel slag is a typical by-product which does not have a clearly defined purpose in recycling. Thus, countries around the world are putting great efforts into developing a purpose for the recycling of steel slag. The vast habitat foundation of marine life has been destroyed due to recent reckless marine development and environment pollution, resulting in intensification of the decline of marine resources, and a solution to this issue is imperative. In order to propose a method to recycle large amounts of by-product slag into a material that can serve as an alternative to natural aggregate, the engineering properties and applicability for each mixing factor of environment friendly porous concrete as a material for the composition of seawater purification were in this study. Regarding the nutrient elution properties, it was clear that the nutrients continuously flowed out up to an immersion time by 8 months in natural seawater; the nitrogenous fertilizer displayed excellent elution properties in this regard.

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.4
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• pp.112-118
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• 2012

Steel industry produces many by-products and wastes such as blast furnace slag, electric arc furnace slag, and converter slag. As in the case of rock, the main component of steel slag are CaO and $SiO_2$ ; further, steel slag is as alkaline as portland cement or concrete. Electric arc furnace oxidizing slag is possible to use as an aggregate for concrete ; however, it has been reclaimed because of it's expansibility caused by free CaO. Recently, a innovative rapid cooling method for melting steel slag has been developed in Korea, which reduces free lime content to minimum level and increases the stability of iron oxide. Therefore, this study describes the results of a series of research to utilize globular shape of electric arc furnace oxidizing slag fine aggregates made by rapidly cooled method for the construction industry by cooling rapidly melted slag from the steel industry. First of all, an experiment was carried out to investigate the quality characteristics of rapidly cooled electric arc furnace oxidizing slag fine aggregates in order to determine whether they can be applied to the construction industry. Then, by applying them to concrete of various particle sizes, we explored experimentally the desired condition to apply rapidly cooled electric arc furnace oxidizing slag fine aggregates to concrete.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.1
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• pp.1-8
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• 2023

In this study, to reduce CO₂ emission in the cement manufacturing process, we evaluated the limestone that is used as a raw material for cement, substituted with steel slag by the various substituted levels. Based on the chemical composition of each raw materials including limestone, and blast furnace slow cooling slag, converter slag, and KR slag as an alternative raw material, we simulated the optimal cement raw mixture by the substitution levels of limestone. Test results indicated that the steel slags contain a certain level of CaO that can be used as alternative decarbonated raw materials, and it has enough to partially reduce the amount of limestonem. And we estimated the maximum usable levels of each raw material. In particular, it was confirmed that by using a mixture of these raw materials rather than using them one by one, the effect of reducing limestone was increased and CO₂ emission from the cement manufacturing process could be reduced.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.11a
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• pp.265-268
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• 2009

전기로 산화 슬래그 골재는 철강산업의 부산물을 재활용한다는 측면에서 친환경적일 뿐만 아니라 고갈되고 있는 골재자원을 대체할 수 있다는 측면에서 중요한 가치를 지닌다. 본 연구에서는 다량의 철성분을 함유하고 있어 높은 밀도를 나타내는 전기로 산화슬래그 골재를 사용한 친환경 콘크리트의 횡구속 성능에 관하여 검토하였다. 이 실험에서는 전기로 산화슬래그 굵은 골재 및 잔골재를 적용한 콘크리트 공시체를 제작하여 천연 굵은 골재와 잔골재를 적용한 콘크리트의 횡구속 거동을 파악하였다. 실험변수는 콘크리트 제작에 사용한 골재의 종류, 횡보강에 사용한 나선 철근의 항복강도로 하였다. 실험결과 전기로 산화슬래그 골재를 사용하였을 경우 천연골재를 사용한 실험체와 유사한 횡구속 효과를 보였다.

• Magazine of the Korea Concrete Institute
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• v.24 no.6
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• pp.28-30
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• 2012