• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.25-26
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• 2023

The internal core material and external color of a sandwich panel have a significant impact on the performance of the sandwich panel. For use on roofs and walls, the internal core material and external color must be considered. Therefore, the surface and back side temperatures were measured for each exterior color and inner core material type. For the internal core materials, urethane foam and Expanded Poly Styrene(EPS), which are core materials mainly used in sandwich panels, were selected. As colors, black and ivory were selected according to brightness, and a total of five colors were selected: red, blue, and green, which are the three primary colors of light. As a result, there were differences in surface and temperature depending on the external color and type of internal core material. Regardless of the color, the temperature was measured lower for panels with urethane foam than for panels with an internal core of EPS. This is believed to have been influenced by the difference in thermal conductivity of urethane foam being 0.023W/(m·K) and that of EPS being 0.032W/(m·K). In addition, panels with a black exterior color were found to have higher surface and back temperatures than panels of other colors, and ivory-colored panels had lower back temperatures regardless of the core material. This is proportional to the brightness and light-absorbing characteristics.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.261-266
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• 2003

This study is to investigate the heating value and noxious gases generation such as CO, NO and $SO_2$ known as dangerous gas for human from specimen made of cement and lightweight aggregate. The most quanity of CO gas is generated in EPS(Expanded Poly Styrene), core of commercial sandwich panel. Although specimens mainly composed of cement discharged the relatively less CO gas than organic core such as EPS, specimens which SBR was added discharged the very much amount of CO gas similar to EPS and especially, specimens including foaming agent, gas foaming agent or redipersible powder of VA/VeoVa showed the good properties in the generation of CO gas. From the standpoint of the generation of NO and $SO_2$ gas, both the core of commercial sandwich panel such as EPS, Glass wool and specimens made with polymer dispersion such as St/BA and SBR discharge the very much amount of NO and $SO_2$ gas in comparison of the other specimens. From this study, it was confirmed that organic materials such as core of commercial sandwich panel dischared much more noxious gas than specimens composed of cement and inorganic lightweight aggregate.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 가을 학술논문 발표대회
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• pp.77-78
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• 2022

To improve the fire vulnerability of the organic insulation sandwich panel core, which is the main culprit of the large-scale fire disaster, an experiment was conducted to examine the thermal conductivity properties of the core material mixed with the organic insulation material EPS Bead and the inorganic insulation material glass wool. As the Additional ratio of glass wool increased, the thermal conductivity decreased, and it was determined that the replacement of glass wool of 3% or more had little effect on the decrease in thermal conductivity. In addition, it can be seen that the most ideal thermal conductivity is exhibited when 1% Replacement ratio of EPS and 3% glass wool are added. The core material of such organic and inorganic insulation materials is judged to be a core material that can compensate for the fire vulnerability of existing insulation materials. Therefore, in order to determine whether it is used as a core material for sandwich panels, additional studies such as fire resistance experiments and sound absorption experiments are needed in the future.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.31-34
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• 2003

Sandwich panel is composed of the facing sheets which support the external load, the cellular core with the low thermal conductivity and the adhesive agent to bond them. The cellular core was produced by binding lightweight cellular aggregates with cement and two types of acrylic base St/BA emulsion were added with a view to improving the workability ion due to high absorption of light weight aggregate and to develope more strength, respectively. This investigation is to comprehend the effect of the addition of two types of St/BA on thermal conductivity, calorific value and exhaustion content of noxious gas in addition re compressive and flexural strength. Flexural strength of the specimen made with St/BA-2 ranged 20kgf/cm2 to 25kgf/cm2 and was about 50% to 100% as high as that of the non-fiber specimen. Thermal conductivity was recorded from 2.0 to 3.0 kcal/mh$^{\circ}C$ and calorific value of St/BA modified specimen was much lower than that of commercial sandwich panel core of EPS and urethane. Careful caution has to be taken because generation of noxious gas such as CO, NO and SO2 tend to increase with addition of polymer cement ratio.

• 한국화재소방학회논문지
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• 제31권6호
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• pp.74-82
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• 2017

유기단열재를 사용한 샌드위치패널(복합자재) 건축물 화재는 소화가 어려우며, 가연성 심재를 통한 빠른 화재 확산으로 화재 시 피해가 크다. 샌드위치패널은 양면이 불연재로 되어있고, 불연재 사이에 심재인 단열재로 이루어져 있다. 단열재는 유기단열재와 무기단열재가 사용되고 있으며, 유기단열재가 무기단열재에 비하여 약 80% 이상 사용되고 있다. 유기단열재는 무기단열재에 비하여 경제적인 장점이 있지만 화재에 취약하다는 단점을 가지고 있기 때문에 샌드위치패널 화재 시 일반화재에 비하여 피해가 크다. 가스유해성시험의 경우 복합자재의 심재 위험성을 측정하기 위해 패널에 지름 25 mm 크기 3개의 원형 천공을 하여 시험하지만 콘칼로리미터 시험은 샌드위치패널 형태 그대로 시험을 진행한다. 본 연구에서는 KS F ISO 5660-1 콘칼로리미터 시험에서 복합자재의 경우 불연재인 표면에 가열한 경우와 천공을 통한 심재 노출 시험 및 심재에 직접가열 시 발생하는 화재의 위험성을 측정하였다. 시험에 사용된 유기단열재는 일반 EPS와 난연 EPS를 사용하였으며, 시험체 구성은 샌드위치패널, 천공된 샌드위치 패널, 심재의 3가지 형태로 시험을 진행하였다. 본 연구의 목적은 콘칼로리미터 시험 시 복합자재 심재의 화재 위험성을 평가하는 방안을 제시하고자 하였다.

• 한국화재소방학회논문지
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• 제22권5호
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• pp.72-78
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• 2008

본 연구에서는 EPS 샌드위치 패널 심재에 대한 일정한 외부 복사열에 의한 질량감소속도와 열방출특성을 분석하였다. 일정한 외부 복사열원에 노출된 EPS 샌드위치 패널 심재의 질량감소속도와 열방출특성을 분석하기 위해 3가지 Type의 시료를 사용하였으며, 연소열을 측정하기 위해 Oxygen bomb calorimeter를 질량감소속도와 열방출특성을 분석하기 위해 Mass loss calorimeter를 사용하였다. 질량감소속도와 열방출 특성을 분석하기 위해 $100mm{\times}100mm{\times}50mm$ 크기의 시료를 사용하였다. 연구결과 50 kW/$m^2$의 외부복사열원에서 평균질량감소속도는 Type A와 B의 경우 각각 2.7 g/$m^2s$, 2.8 g/$m^2s$로 비슷한 경향을 나타낸 반면, Type C는 2.3 g/$m^2s$로 상대적으로 낮게 나타났으며, 평균열방출속도는 Type B와 C의 경우 각각 47.19 kW/$m^2$, 50.06 kW/$m^2$으로 큰 차이가 없었으나, Type A는 58.23 kW/$m^2$으로 상대적으로 높게 나타났다. 열방출특성의 결과를 캐나다 분류체계에 적용할 경우 Type A와 C의 경우 C-3등급, Type B의 경우 C-2등급으로 분류되었다. 향후 콘칼로리미터법을 이용한 샌드위치 패널 심재에 대한 열방출율 특성과의 비교연구가 필요할 것으로 판단된다.