• Magazine of the Korea Concrete Institute
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• v.10 no.5
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• pp.217-225
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• 1998

분쇄한 FRP(Fiver-Reinforced Plastics) 폐기물을 사용한 폴리머 모르타르의 물성에 고나하여 조사하였다. 분쇄한 FRP 폐기물을 시멘트 모르타르의 세골재로 재활용하기 위하여 세골재에 대하여 0~50wt% 치환.사용하였고, FRP 폐기물의 사용으로 나타나는 강도 저하현상을 보완하기 위하여 3종류 폴리머 혼화제의 첨가량을 변화시켜 각종 공시체를 제작하였다. 폴리머 혼화제로서는 styrene-bytadiene rubber(SBR) 라텍스, polyacrylic ester(PAE) 에멀젼 및 ethylene-vinyl acetate(EVA)에멀젼을 사용하였다. 분쇄한 FRP 폐기물을 사용한 시멘트 모르타르에 폴리머 혼화제를 첨가하여 만든 폴리머 시멘트 모르타르는 폴리머 혼화제를 첨가하지 않은 모르타르보다 압축 및 휨강도가 크게 증가하였다. 폴리머 시멘트비 10wt%에서 세골재 대용으로 분쇄한 FRP 폐기물의 적정 치환량은 20wt%로 나타났다. 8$0^{\circ}C$에서 가열양생하여 제조한 폴리머 시멘트 모르타르는 폴리머 시멘트비 10wt%이하에서 표준양생한 모르타르보다 강도가 저하되었다. 폴리머 시멘트 포르타르의 흡수율은 폴리머 시멘트비가 증가함에 따라 크게 감소하였다.

• Journal of the Society of Naval Architects of Korea
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• v.40 no.1
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• pp.55-62
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• 2003

This study has investigated physical and chemical properties of FRP waste, has manufactured polymer cement mortar using a crushed waste with sand and has evaluated its capability to develop the economical waste recycling technology. The study has investigated tension strength, hardness test and impact test as physical properties and also thermogravimetric characteristics and analyzed infrared spectroscope as chemical properties. Then the study has manufactured polymer cement mortar and has analyzed how the FRP waste fine aggregate replacement ratio has an effect on compression strength. Noticing admixture can complement strength drop occurred by the FRP waste fine aggregate replacement, the study examined an optimum rate of admixture addition and its reaction through electron microscope photos.

• Journal of the Society of Naval Architects of Korea
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• v.41 no.1
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• pp.82-87
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• 2004

The purpose of this paper is to obtain the data for manufacturing of microbe carriers as a method of FRP waste recycling technology. Since FRP waste is polymer, the experiment of the thermogravity analyzing was carried out to find thermal behavior. After that, microbe carriers were prepared from waste FRP powder, which had been decomposed, milled, and mixed with clay as a binder and CaCO3 as a flux and a loaming agent, respectively. finally it was made by filing of the sample up to 1,05$0^{\circ}C$. It was investigated how the variation of the additives and firing temperature effect apparent density, water absorption and micro structure.

• Proceedings of the Korea Concrete Institute Conference
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• 1996.10a
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• pp.84-92
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• 1996

The flexural and compressive strengths of polymer-modified mortars containing FRP wastes were investigated. The specimens of polymer-modified mortars containing FRP mortat were perpared by using styrene-butadiene rubber(SBR) latex, ethylene-vinyl acetate(EVA) emulsion and polyacrylic ester(PAE) emulsion with various FRP-sand ratios(10, 20, 30, 40, 50wt%). The compressive and flexural strengths of polymer-mokified mortars containing FRP wastes were decreased with an increase of FRP-sand ratio. But the compressive and flexural strengths of PAE polymer-modified mortar were more improved than OPC, whereas those of SBR and EVA polymer-modified mortars containing FRP wastes were decreased than OPC.

• Journal of the Korean Society for Marine Environment & Energy
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• v.12 no.1
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• pp.29-34
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• 2009

For several decades, many researchers have been involved in developing recycling methods for FRP boats. There are four basic classes of recycling covered in the literature. Despite of environmental problems(safety hazards), mechanical recycling of FRP boats, which involves shredding and grinding of the scrap FRP, is one of the simpler and more technically proven methods than incineration, reclamation or chemical ones. Because FRP is made up of reinforced fiber glass, it is very difficult to break into pieces. It also leads to secondary problem in recycling process, such as air pollution and unacceptable shredding noise level. Another serious problem of mechanical FRP recycling is very limited reusable applications for the residue. This study is to propose a new and efficient method which is more wide range applications and environment friendly waste FRP regenerating system. New system is added with the cyclone sorting machine for airborne pollutions and modified cutting system for several glass fiber chips sizes. It also has shown the FRP chip fiber-reinforced concrete and fiber-reinforced secondary concrete applications with the waste FRP boat to be more eligible than existing recycling method.

• Applied Chemistry for Engineering
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• v.21 no.2
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• pp.217-223
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• 2010

In general, fiber-reinforced plastics (FRP) wastes are simply buried or burned. Landfill brings about a permanent contamination of soil due to the inability of FRP to decompose and incineration causes an issue of generating toxic gases and dusts. There have been several ways to treat the FRP wastes such as landfill, incineration, chemical recycling, material recycling and the utilization of energy from combustion. Most methods excluding material recycling are known to have critical limitations in economic, technical and environmental manners. However it is known that material recycling is most desirable among the methods handling FRP wastes. In this study, to investigate the purpose of feasibility of material recycling, various bulk molding compound (BMC) specimens were prepared with the various contents of unsaturated polyester resin binder (25, 30, 35 wt%) and the various replacement ratios of FRP wastes powder (0, 25, 50, 75, 100 wt%) substituted for filler. To evaluate the physical properties BMC specimens, various tests such as tensile strength, flexural strength, impact strength, hot water resistance and SEM imaging were conducted. As a results, mechanical strengths decreased with an increase of replacement ratio of FRP waste powder and physical properties of BMC specimens were deteriorated in the hot water resistance. The fluidity of BMC with more than 50 wt% of the replacement ratio of FRP wastes powder decreased remarkably, causing a problem in the BMC composite.

• Magazine of RCR
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• v.17 no.1
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• pp.8-9
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• 2022

• Proceedings of the KIEE Conference
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• 2008.09a
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• pp.58-60
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• 2008

발전소에서 만들어진 전력을 소비자까지 수송하는 송변전변 및 배전설비를 주 대상으로 하는 전력계통 설비의 운영에는 전력의 수송과 이를 위해 설치되는 각종 기자재로부터 인체 및 재산의 안전을 확보하기 위해 많은 종류의 절연재를 사용하고 있다. 지금까지 전력분야에서 사용되어 온 절연재는 자기재(porcelain)가 주종을 이루어 왔으나 재료기술의 발달과 함께 폴리머 절연재료들이 속속 개발되면서 자기재에 비해 가격 및 시공성 등에서 이점이 많은 폴리머 절연재가 자기재를 대체하고 있다. 그러나 폴리머 절연재료는 기들의 재질 및 사용 환경 등에 따라 일정 수명을 가지는 것으로 나타나 수명종기에 이르면 폐기물로 배출되게 된다. 전력산업 중 배전분야에서는 2007년 구매한 기자재를 기준으로 연간 13만연 톤의 전력폐기물이 발생될것으로 예측되었으며 이들은 PE, XLPE, FRP, PVC, EPDM, Silicone 등 유기성분이 약 40%, Cu, Al, 철 등 금속과 무기성분이 약 60% 인 것으로 조사되었다. 그러나 전선 및 케이블류를 제외한 기자재를 대상으로 한 분석에서는 유기성분의 함량이 90%에 이르며 이들은 석유화학공업의 원료로부터 만들어지는 특성상 높은 에너지를 함유하는 것으로 나타난 바, 이들을 적정하게 처리하는 방안의 확보는 폐기물의 처리 외에 폐기물로부터 에너지를 회수하여 자원화하는 것이 가능한 것으로 보여진다.

• Journal of Korea Ship Safrty Technology Authority
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• v.20
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• pp.18-28
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• 2005

연안소형어선에 주로 사용하는 FRP선질은 가볍고 강도는 우수하나 인화성이 높아서 기관실 화재사고 등 위험에 노출되어 있고 선박 제작 과정에서 인체에 해로운 유해성분이 발생할 뿐만 아니라, 폐선의 경우 산업폐기물로써 환경오염에 큰 영향을 미치고 있다. 그런 반면에, 알루미늄합금 어선은 FRP 어선의 단점을 보완할수 있는 재료로써, 고강도 경량화의 효과를 낼 수 있고, RFP어선보다 인화성이 낮아서 열에 강하고 내구성이 높고 강선보다 해수의 부식방지에 뛰어나므로 알룸늄어선의 개발이 요구되고 있다. 이번 호에서는 알루미늄선박 건조시 각각의 단위공정에 대한 작업방법, 작업순서 및 주의사항 등 표준에 대해 코리아타코마조선공법(주)의 알루미늄선박 작업지침과 KSB 0897(불황가스 및 아크용접 작업표준)를 일부 발췌하여 기술하고자 한다.

• Journal of the Society of Naval Architects of Korea
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• v.38 no.1
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• pp.99-107
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• 2001

Manufacture of fishing vessel is needed the effective material for light, strength, fire and corrosion of water in order to improve durability by high-speed and fishing. These fishing vessel can be divided into FRP and AI alloys fishing vessel. FRP fishing vessel is light and effective for strength but highly ignited and susceptible to heat during the manufacturing ship by-produce noxious component for human. In the case of a scrapped ship, it cause environmental pollution. On the other hand, aluminum is a material in return for FRP and has merit of high-strength and lightness. It's more heat proof and durable than FRP and superior to prevent from corrosion. Al alloys fishing vessel development is rising as an urgent matter. But, al alloy has some defect of bad weldability, welding transformation, cracks and overcost of construction. Therefore this study is to develop the new welding joint shape solving aluminum defects and mechanical behavior. First of all, strength was compared and reviewed by analysis of plate, stiffen plate, new model simplified by using plate theory. On the base of this result, plate and new model of temperature distribution, weld residual stress and strength of tensile, compressive force were compared and reviewed by finite element computer program has been developed to deal with heat conduction and thermal elasto plastic problem. Also, new model is proved application possibility and excellent mechanic by strength comparison is established to tensile testing result.