• 한국재난정보학회 논문집
• /
• 제15권3호
• /
• pp.402-408
• /
• 2019

연구목적 : 포소화설비에 사용되는 중발포 소화약제는 기류에 영향이 적어 방출거리를 유지 할 수 있을뿐만 아니라 소화약제도 효율적으로 사용 할 수 있기 때문에 중발포기를 이용하여 발포배율 및 소화성능을 실험으로 밝히고자 한다. 연구방법 : 본 연구를 위해 중발포 시험장치를 제작하여, 합성계면활성 제포를 대상으 로 유류화재(B급) 소화성능 및 발포배율 분석과 포소화약제 소모량을 측정하고 분석하였다. 연구결과: 중발포기로 발포배율을 측정한 결과 팽창율이 26.1배의 중발포 배율로 나타났으며, 유류화재 20단위 소화모형 실험결과 소화시간이 고발포 및 저발포 보다 빠르게 나타나, 수동식설비인 호스릴 또는 중발포기 적용이 가능할 것으로 본다. 결론: 본 연구를 통해 중발포 포소화약제 발포성능 및 소화성능이 우수하게 나타나는 점을 고려하여 중발포 소화약제를 활용한 호스릴 또는 중발포기의 기술기준 도입이 필요하다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2003년도 학술.기술논문 발표회
• /
• pp.49-52
• /
• 2003

The objective of this study the mechanical characteristics of prefoamed lightweight foamed concrete using the mineral foam agent which has high lightness, and strength. The compressive strength of lightweight foamed concrete using mineral foam agent are about 2 times degree high those the of lightweight foamed concrete using vegetable foam agent. Lightweight foamed concrete was able to obtain the result of 50kg/㎠ or more compressive strength, when was unit weight 0.8t/㎡. In the case of the same unit weight of concrete, it is influenced by w/c of foam agent ratio. The paper present extensive data on characteristics of compressive strength of the concrete manufatured with the different factors in mix design and also present optimum mix proportion.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
• /
• pp.198-201
• /
• 2001

Porous structures of aluminum foam have been studied by using return aluminum scrap. The apparent foam shape, foam height, density, pore size and their distributions in various section areas of the experimental samples have been investigated. The sample have been cast into metallic mold, using aluminum foam prepared from a precursor based on pure Al ingot and return aluminum scrap mixed with various amounts of 1-2wt% increasing viscosity and foam agent materials. The process provides for flexibility in design of foam structures via relatively easy control over the amount of hydrogen evolution and the drainage processes which occur during foam formation. This is facilitated by manipulating parameters such as the foaming agent, thermal histories during solidification and mix melt viscosities. A metal for producing the foamed are decomposing a foaming agent in a molten metal such that there is an initial and a subsequent expansion due to foaming agent. It has been found that the Al porous foaming with variation amount of 1∼2wt% foam agent and at 2min holding time, which melting temperature has appeared homogeneous pore size at 650∼700$^{\circ}C$. The compression strength were 10-13 kg/min at 125ppi, and increased by higher pore density. The acoustical performance of the panel made with the foamed aluminum is considerably improved; its absorption coefficient shows NRC 0.6-0.8. It has been found that the Al foam is very preferable for the compactness of the thermal system.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2016년도 추계 학술논문 발표대회
• /
• pp.22-23
• /
• 2016

This study analyzes the properties of foam according to the concentration of vegetable foaming agent that is used in traditional and mixed foaming agent of developing stage, and confirms how the foams influence foamed concrete by searching for properties of foamed concrete according to replacing ratio of vegetable foaming agent and mixed foaming agent. This is for the purpose of providing basic data for the use of foamed concrete through improvement on the problem such as unstability, falling in fluidity and the strength of existed foaming agent.

• Elastomers and Composites
• /
• 제58권2호
• /
• pp.65-69
• /
• 2023

To reduce the weight of the engineering plastic Nylon 6 resin, two high-temperature foaming agents, p-toluenesulfonyl semicarbazide (PTSS) and 5-phenyltetrazole (5-PT) (0-10 phr), were added and foamed without other additives. We investigated the effects of the foaming agent type and content on the foam density (g/cm³) and percent weight reduction rate of the Nylon 6 foam, and 5-PT exhibited better foaming performance than PTSS. In the case of 5-PT, the weight reduction rate was above 36% when the blowing agent content was 1.5 phr or higher, indicating that 5-PT is an effective blowing agent for reducing the Nylon 6 foam weight. Additionally, we studied the effect of the nucleating agent Talc content (0-0.4 phr) on Nylon 6 foaming, and the nucleating agent Talc considerably reduced foaming.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2003년도 학술.기술논문발표회
• /
• pp.49.1-52
• /
• 2003

The objective of this study the mechanical characteristics of preformed lightweight foamed concrete using the mineral foam agent which has high lightness, and strength. The compressive strength of lightweight foamed concrete using mineral foam agent are about 2 times degree high those the of lightweight foamed concrete using vegetable foam agent. Lightweight foamed concrete was able to obtain the result of 50kg/$\textrm{m}^3$ or more compressive strength, when was unit weight 0.8t/$\textrm{m}^3$. In the can of the same unit weight of concrete, it is influenced by w/c of loan agent ratio. The paper present extensive data on characteristics of compressive strength of the concrete manufactured with the different factors in mix design and also present optimum mix proportion.

• 한국안전학회지
• /
• 제30권4호
• /
• pp.79-85
• /
• 2015

Onboard fire extinguishing system is important to protect cargo and human lives and every oil tanker has foam type fire extinguishing system. Because of environmental problem, agent which contains materials such as Perfluorinated compounds are regulated and the development of the environmental friendly agent is required. The protein foam has less environmental pollution problem and has an excellent fire extinguish performance to oil fire. In the research, bivalency metal salts were added as stabilizer to increase fire resistance and stability of the foam. Ferrous sulfate, Iron chloride and Nickel chloride were used and to adjust to vessel, sea water was applied. As a stabilizer increased, the expansion ratio was raised. However 25% drainage time was decreased over 2.0 wt.% which is knowable that the foam brokes easily. The amount of generated foam was measured to check fluidity of foam and it appeared that when $FeSO_4$ 1.2 wt.% was added, the amount of generated foam reached large and also the 25% drainage time was high. To evaluate the fire extinguishing performance for oil fire, the small scale oil fire test was executed. When $FeSO_4$ 1.2 wt.% was added, fire extinguishing time was in its shortest which informs fluidity of foam and stability are important factors on fire extinguishing efficiency.

• 한국주조공학회지
• /
• 제30권6호
• /
• pp.241-246
• /
• 2010

The viscosity of foam metal is necessary to get the pores, but it is difficult to manufacture net-shape foam, because the fluidity decreases by increasing viscosity. In this study, the A356 alloy which has good fluidity and less defect was selected and fabricated to foam metal. To understand about effect of thickening agent on foaming and mechanical properties, quantity of thickening agent was changed. The pore size, porosity and distribution of foam metal were measured by i-solution program. And compression test were performed by UTM. In case of 3.0wt% Ca in thickening agent, it is found that most of foam consist of homogeneous shape, and the growth height had the highest value of 204 mm in the all fabricated foams. The porosity was 93% and compressive strength was 3.1 MPa. In the microstructure, the $Al_2Si_2Ca$ intermetallic compound and Ti were observed. The vickers hardness value rose with increasing viscosity value.

• 콘크리트학회논문집
• /
• 제24권1호
• /
• pp.61-70
• /
• 2012

최근 정부는 '저탄소 녹색성장 기본법'을 시행하여 국가 총체적 차원에서 에너지 절감, 온실가스 저감을 위한 노력을 기울이고 있다. 건물부문에서는 건물외피와 단열재의 열적 특성을 검토하여 건물 자체의 단열성능을 높임으로써 에너지를 절감할 수 있다. 이 연구는 건물부문의 에너지 절감을 목적으로 건물에 적용 가능한 경량기포 콘크리트 단열패널을 개발하기 위한 연구로서, 기포제 종류(AES, AOS, VS, FP)와 기포제 희석농도(1%, 3%, 5%), 기포율(30%, 50%, 70%)에 따른 기포 콘크리트의 물리·역학적 특성 및 열적 특성을 검토하여 에너지 절감을 위한 단열재로서의 최적조건을 찾고자 하였다. 실험 결과, 발포율에 영향을 미치는 기포제가 포함된 수용액의 표면장력은 AOS를 사용한 경우가 다른 기포제를 사용한 경우보다 낮게 나타났다. FP는 표면장력의 저하량이 크지 않고 발포율이 낮기 때문에 저농도로 희석한 경우 다량의 수분을 함유하고 있는 안정적이지 못한 기포가 생성되어 3% 이상 사용하여야만 비교적 안정적인 기포를 만드는 것이 가능하였다. 또한, 압축강도와 열전도율은 저밀도 영역에서는 기포제 종류에 따른 차이는 발생하지 않았으나, 상대적으로 고밀도영역에서 압축강도는 AOS와 FP, 열전도율은 VS와 FP가 더 효과적인 것으로 나타났다. 또한, 기포농도와 기포율이 증가할수록 공극 크기는 커지며 열린공극을 형성하는 것으로 나타났으며 모든 기포제에 대한 열전도율은 KS기준을 만족하여 우수한 단열재로서의 가능성을 보였다. 종합적인 분석 결과, FP를 농도 3%로 사용하여 제조한 시험체가 건물에 적용시 기포 콘크리트 단열패널로서 가장 우수한 성능을 발현할 것으로 판단된다.

• 한국안전학회지
• /
• 제29권2호
• /
• pp.18-23
• /
• 2014

Foam extinguishing agent is widely used for extinguishing combustible liquid fires. Compared to other foam type extinguishing agents, protein foam has relatively low cost and low toxicity and produces stable foam blanket which is excellent in heat resistance and sealability, despite it has weak fluidity. Therefore the study investigated foaming characteristics followed by various factors affecting the fluidity of the protein foam extinguishing agent. The extinguishing characteristics differentiated by the changes in fluidity were also experimented. Foaming performance was compared by measuring the expansion ratio and the 25% drainage time. Moreover, the 25% drainage time and the extinguishing time was compared. The results showed that the 25% drainage time and the expansion ratio were increased as the pressure of nozzle and the concentration of hydrolyzed protein liquid enlarged. However the foaming and extinguishing performance were not improved when the condition exceeded certain level of pressure and concentration. The fastest fire extinguishing condition was the nozzle pressure 4bar with the 85wt.% of concentration of hydrolyzed protein liquid.