• 한국지하수토양환경학회지:지하수토양환경
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• 제21권2호
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• pp.1-7
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• 2016

Ferrous slag is a by-product from steel making process and waste concrete is generated from construction activities. Large part of ferrous slag and waste concrete are recycled as construction materials. However, Ca²⁺ leaching out of ferrous slag and waste concrete in the water-contacting environment can cause a strength change. Strength can be reduced due to the dissolution of solid form of CaO which is one of the main contents of ferrous slag and waste concrete. On the other hand, strength can be enhanced due to the pozzolanic reaction of cementitious components with water. In this study, steelmaking slag, blast furnace slag, and waste concrete were aged by exposure to raining events, and the change of their compaction and shear strength characteristics was investigated. Optimum moisture content of all materials used in this study increased with aging period while maximum dry unit weight slightly decreased, implying that the relative contents of fine particles increased as the CaO solid particles were dissolved. Internal friction angle and shear strength of recycled materials also increased with aging period, indicating that the materials became denser by the decrease of void ratio attributed to the fine particles generated during the weathering process and the development of cementitious compounds increasing the bonding and interlocking forces between the particles. The results of this study demonstrated that mechanical strength of recycled materials used as construction materials has little chance to be deteriorated during their service life.

• 자원리싸이클링
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• 제33권1호
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• pp.3-14
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• 2024

LED 산업은 기술의 발전과 에너지 절감 정책을 바탕으로 수요가 급증하면서 시장은 급격히 확대되고 있다. 그에 따라 지속적으로 축적되는 LED 폐자원의 효율적인 재활용이 사회적 관심으로 증가하고 있어 현재 LED 폐자원의 재활용 상황과 향후 나아갈 방향에 대해 고찰하였다. 현재 LED 폐자원의 재활용은 Ga 회수기술에 초점이 맞춰져 있어 전처리 및 고부가가치 소재의 농축/회수 등 통합적인 재활용 기술 개발이 요구되는 상황이다. 본 논문에서는 LED 폐자원의 현황 및 재활용 기술을 알아보고 향후 방향에 대해 제시하였다.

• Composites Research
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• 제17권2호
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• pp.21-27
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• 2004

본 논문에서는 화학처리된 페 페인트와 페 스티로폼을 사용한 폴리머 콘크리트를 제작하고 그 기계적 특성을 평가하였다. 또한 골재와 수지재의 조성비 변화에 따른 압축강도, 비중, 흡수율 등을 평가하였다. 실험결과로부터 페 페인트를 사용한 폴리머 콘크리트의 비중은 기존의 폴리머 콘크리트 보다 낮은 값을 가지며, 건축용 외장재로 사용할 수 있을 것으로 판단되었다.

• Elastomers and Composites
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• 제31권2호
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• pp.95-103
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• 1996

Nowadays, recycling of waste materials is one of great attention among all industries. Especially, the waste tires become a significant problem with increasing in a number of automobiles. For recycling of the waste tires, a polyurethane binder was mixed with the scrapped rubber powders obtained from tread part of the waste tire. This study covered the effect of processing conditions;curing temperature and curing time;on the mechanical properties of the blend. We also compared the experimental results from labors-tory scale with those from scale-up.

• Elastomers and Composites
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• 제50권1호
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• pp.24-29
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• 2015

In this study, we investigated the effects of a crosslinking agent and a compatibilizer on the mechanical and rheological properties of waste PP and waste ground rubber tire (WGRT) composites. In order to simulate a commercial TPV, the component of waste PP and WGRT was fixed at 30 and 70 wt%, respectively. With the simple addition of SEBS-g-MA into the waste PP/WGRT composites, the tensile strength of the composite was decreased, whereas both the elongation at break and impact strength were significantly increased because of rubbery characteristics of SEBS-g-MA. In order to further improve the properties of the composites, the waste PP/WGRT/SEBS-g-MA composites was revulcanized with dicumyl peroxide (DCP). As expected, mechanical properties of the revulcanized composites was generally improved. Especially, with 15 and 1 phr of SEBS-g-MA and DCP, elongation at break was highest value of about 183% because of the recross-linking of WGRT without chain scission of the main chain. It was found that complex viscosity of the revulcanized composite increased which might verify further vulcanization of the WGRT.

• 자원리싸이클링
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• 제24권1호
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• pp.58-65
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• 2015

국내 디스플레이 산업의 핵심기술과 글로벌 점유율은 세계 최고 수준이지만 폐 디스플레이의 재활용 관련한 전반적 기술은 매우 미흡하고 폐 디스플레이의 유리소재는 전량 매립하고 있는 실정이다. 본 논문에서는 폐 초박막 액정표시장치(Thin Film Transistor Liquid Crystal Display) 유리를 고강도 콘크리트 파일 및 발포체의 원료로 재활용 하는 연구, 초박막 액정표시장치 제조 공정에서 발생하는 불량품인 파유리를 장섬유 및 단섬유 등으로 재활용 하는 연구 동향에 대하여 조사하였다. 폐유리를 재활용한 원료 성분은 고강도 콘크리트 파일과 발포체 원료로 재료 재활용이 가능한 것으로 입증되었으며 특히 콘크리트 파일의 경우 기존 제품보다 향상된 특성을 나타내었다. 이외에도 파유리를 장섬유나 단섬유로 재활용 하는 기술은 이미 상용화 단계에 있으므로 향후 폐 디스플레이 유리 소재의 상용화 재활용 시스템을 구축할 수 있는 기술을 확립하는 방향으로 연구를 진행할 필요가 있다.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2017년도 추계학술논문요약집
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• pp.201-202
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• 2017

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.148-149
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• 2013

Recently, the construction industry in South Korea, has experienced many difficulties in lack of supply with construction materials. Since waste shells can be possibly used as replacement materials of fine aggregate, the successful application can resolve, to some extent at least, the economic problems and environmental problems. In this research, the basic physical properties of the mortar which was used as fine aggregate substitute (clam, cockle, manila clam, oyster) were evaluated. According to the experimental results, the absorption rate and compressive strength of samples with various shells were equivalent to that of plain mortar. The mortar which replaced 25% of oyster shell with sand showed approximately 30% lower compressive strength and twice as much absorption as plain mortar. It was found that waste shells can be used as replacement materials of fine aggregate, but the oyster shell requires further experimental works in order for its successful application.

• Advances in concrete construction
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• 제13권 2호
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• pp.133-152
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• 2022

Ecological issues such as natural resource reduction and enormous waste disposals are increasingly leading in developing civilization toward sustainable construction. The two primary environmental issues are the depletion of natural resources and the disposal of trash in open landfills. Waste steel fiber (WSF) was investigated for usage as a cement-based concrete (CBC) constituent in this research. Recycling waste fibers both makes cement composites more long and cost-effective, also aids in pollution reduction. The objective of this study is to analyze the impacts of waste fiber on the fresh and mechanical features of concrete using recycled additives. A comparative research on the durability and mechanical qualities of fiber-reinforced concrete (FRC) constructed with natural aggregates was conducted for this aim. The obstacles to successful WSF recycling methods application in the building industry have been investigated, resulting that CBCs with these fibers make an economic and long lasting choice to deal with waste materials. The workability of fiber enhanced concrete was found to be comparable to that of normal concrete. Fibers have a considerable impact on the splitting tensile strength, flexural and compressive strength of recycled concrete. Fiber may enhance the water permeability. When the WSF content is 0.6 kg/m3, the water absorption is nearly half. Fibers would have no effect on its permeability.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2016년도 추계학술논문요약집
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• pp.193-194
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• 2016