• 한국음향학회지
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• 제41권3호
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• pp.302-311
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• 2022

방음벽은 도심구간의 도로 및 철도에서 환경소음 저감을 위한 가장 효율적 대안의 하나이다. 도로교통소음 등에 대한 방음벽의 삽입손실은 방음판의 음향투과손실, 흡음손실 및 방음벽의 회절감쇠에 의한 음에너지 저감량의 합으로 이루어진다. 방음판의 음향투과손실은 방음벽의 삽입손실을 결정하는 중요한 요인 중 하나로 방음벽의 성능을 결정하는 기본적인 지표이다. 그럼에도 불구하고 아직까지 우리나라는 방음판의 음향투과손실 측정방법에 관한 별도의 규격이 없다. 방음판의 일반적 재질에 대해 규정하고 있는 KS F 4770 시리즈의 한두 항목으로 가볍게 다루고 있을 뿐이다. 이 논문은 방음판의 음향투과손실 측정 및 평가 규격의 필요성에 대해 고찰하고, 실내 건축부재와 달리 외부공간에 설치되는 방음벽의 특성을 감안한 자유음장(무향실) 수음실에서의 측정방법을 모색하였다. 아울러 도로변이나 철로변 등 다양한 설치장소에 따른 방음효과를 간단히 표시할 수 있도록 기준 스펙트럼을 활용한 단일수치 평가법을 제안하였다.

• 한국건축시공학회지
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• 제19권2호
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• pp.105-112
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• 2019

페로니켈슬래그 잔골재는 천연 잔골재와 유사한 특성이 있어 국내 외적으로 콘크리트 구조물에 사용되고 있으나 그 용도와 연구의 영역이 한정적이다. 이에 본 연구에서는 FNS의 활용성 확대와 모르타르제품의 성능개선을 목적으로 바닥용 건조모르타르에 대한 FNS의 적용성을 검토하고자 하였다. 실험 결과, FNS는 흡수율이 낮고 구형의 입형이며 표면이 유리질 피막의 특성이 있어 모르타르의 플로을 향상시켰다. 또한 골재 자체의 높은 강성은 몰탈 압축강도의 향상 및 수축저감 효과를 나타내어 균열저감 등의 품질향상에 기여할 것으로 판단된다. 뿐만 아니라 천연 잔골재를 사용한 모르타르와 비교하여 FNS를 적용하는 경우 동등수준 이상의 충격음 차단성능을 확보할 수 있었다.

• 설비공학논문집
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• 제19권6호
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• pp.476-484
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• 2007

Recently, in accordance with the buildings are becoming to large-sizes, high-stories, the large scaled facilities and equipments in machine room are quite demanding, and the generated noise volume according to this situation is on increasing. Since such noise is becoming to the object of a serious civil appeal, it is the real situation that a reduction countermeasure against the machine room equipment noise is keenly necessitated. On such viewpoint, this study has recorded, measured the noises which were generated from each individual as same as the whole equipped machines and tools, on the object of the dormitory machine rooms of the 3 colleges that haying mutually different peculiarities, then after grasp-ing their characters and acoustic powers, this research has verified its prediction possibility and the authenticity by comparison the estimated numerical value with the actually measured numerical value through the acoustic simulation. After grasping the prediction possibility in such way, by utilization of the sound absorption material in the machinery room, from the stage of design, the soundproof measures for the noise reduction at machine room could be regulated effectively, and it is also considered that such data would be utilized as the fundamental material for an establishment of the measure for sound insulation.

• 한국실내디자인학회논문집
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• 제24권1호
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• pp.178-188
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• 2015

This study has the main objective of being of help as a reference data for the application of the finishing materials when designing the interior of the chapel of the church space through analysis of the finishing materials against the chapels of church space which has complex function. As precedent studies for this, the composition of the function and concept of the church space was surveyed and the complex function of the church space was surveyed. The theoretical surveyed was performed according to the casual composition, behavior of the community and role and location of the duties of the church members. The case objects were 10 chapels constructed by 5 professional interior design companies. The content of the analysis was the finishing materials in the chapels and their application characteristics. The detailed considerations to be referred to when designing the interior of the chapels of church space in the future were proposed. The analysis result of the application of the finishing materials according to the locational function of the chapels of church space can be explained as follows. First, the platform area was the characteristic of applying finishing materials which induce visual immersion. As for the floor materials in the platform, in order to minimize the floor sound and vibration phenomenon occurring during movements, noise insulation and dust protection rubber sheet was place and on top of it the floor or the carpet was placed. Second, the Choir area had the difficult problem of having to consider the appropriate sound absorption occurring due to the proliferation of sound and performance of classical instruments at the same time. However, in the case, this problem was solved through the sculptures of convex shape. Third, since the scheelite is a space where many people move around, the finishing material which absorbs sound was mainly used. Fourth, the entrance area was composed of thick wall materials compared to other walls, and the sound absorption character was most significantly considered when applying the finishing material. Fifth, the broadcasting room was composed either in independent type or an open type and performed its function and the main finishing materials was transparent glass which was highest use frequency.

• 한국건설순환자원학회논문집
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• 제8권1호
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• pp.17-25
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• 2020

본 연구에서는 폐유리 불연 무기물 발포 보드를 개발하고, 국내 시장에서의 사용 활성화를 위한 과정으로 물리적·역학적·환경적 특성 시험을 통해 건축 내외장재로 활용하기 위한 검증을 목적으로 한다. 이를 위해, 물리·역학적 특성으로 밀도, 흡수율, 압축강도, 내동해성에 대한 시험을 실시하였으며, 환경적 특성으로 열전도율, 불연성능, 가스유해성, 중금속 함유, 곰팡이 저항성 등의 시험을 실시였다. 또한, 실제 건축물 내외장재로 활용하기 위한 적용을 실시하여 실제 건축 자재로 활용하기 위한 검증을 진행하였다.

• 한국재료학회지
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• 제22권6호
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• pp.309-315
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• 2012

Metal foam has many excellent properties, such as light weight, incombustibility, good thermal insulation, sound absorption, energy absorption, and environmental friendliness. It has two types of macrostructure, a closed-cell foam with sealed pores and an open-cell foam with open pores. The open-cell foam has a complex macrostructure consisting of an interconnected network. It can be exploited as a degradable biomaterial and a heat exchanger material. In this paper, open cell Mg alloy foams have been produced by infiltrating molten Mg alloy into porous pre-forms, where granules facilitate porous material. The granules have suitable strength and excellent thermal stability. They are also inexpensive and easily move out from open-cell foamed Mg-Al alloy materials. When the melt casting process used an inert gas, the molten magnesium igniting is resolved easily. The effects of the preheating temperature of the filler particle mould, negative pressure, and granule size on the fluidity of the open cell Mg alloy foam were investigated. With the increased infiltration pressure, preheat temperature and granule sizes during casting process, the molten AZ31 alloy was high fluidity. The optimum casting temperature, preheating temperature of the filler particle mould, and negative pressure were $750^{\circ}C$, $400-500^{\circ}C$, and 5000-6000 Pa, respectively, At these conditions the AZ31 alloy had good fluidity and castability with the longest infiltration length, fewer defects, and a uniform pore structure.

• 한국화재소방학회논문지
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• 제32권1호
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• pp.40-45
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• 2018

무기재로서 질석은 친환경적인 특성과 내화, 단열, 흡음 뿐 만 아니라 결로방지, 탈취 및 미관 등이 우수하므로 건축마감재로서 활용될 경우 효용성이 높을 것으로 판단된다. 본 연구에서는 질석을 주원료로 하여 미네랄 루즈울(Mineral Loose Wool) 또는 미네랄 파우더(Mineral Powder)를 혼입한 건축용 마감보드를 개발하고 불연시험과 단열시험을 수행하였다. 시험결과 두 개의 질석보드 모두 불연재로서 성능을 확보하였으며 열전도율 0.086 및 $0.092W/m{\cdot}K$로 나타났다. 또한 개발된 두 개의 질석보드를 경골목구조 내화벽체 표준상세(KS F 1611-1)의 마감재로 적용하여 내화시험을 수행하였다. 내화시험결과 VB-L 시험체가 VB-P시험체 보다 내화성능이 다소 높게 나타났으며 두 개의 질석보드 모두 두께 30 mm로도 내화성능 2시간 확보가 충분한 것으로 나타났다.

• 한국디지털건축인테리어학회논문집
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• 제12권4호
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• pp.87-95
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• 2012

Autoclaved lightweight concrete (ALC), also known as autoclaved aerated concrete (AAC), is a lightweight, precast building material that simultaneously provides structure, insulation. ALC is a unique building material. Because of its cellular nature, it is lightweight, self-insulating, as well as sound and fireproof. ALC products include blocks, wall panels, floor and roof panels, and lintels. Recently, the use of ALC has became increasingly popular. However, ALC have high water absorption, low compressive strength and popout the origin of the low surface strength in its properties. Thus, this study is to improve the fundamental strength by controls of increasing of admixtures and chemical reactants. Admixtures make use of meta kaolin and silica fume, chemical reactants make use of sodium silicate and sodium hydroxide. From the test result, the ALC using admixtures and chemical reactants have a good fundamental properties compared with plain ALC. These good fundamental properties is caused by the admixtures and chemical reactants of ALC by the reason of the micro filling effect and chemical binding of C-S-H gel, tobermolite and quartz.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2010년도 춘계학술대회 논문집
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• pp.527-528
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• 2010

Previous experimental results performed by many researchers for a couple of decades in South Korea have shown that an absorbing sheet inserted in a conventional floating slab system for thermal insulation or vibration absorption may amplify the vibration of the slab system at specific frequency ranges depending on the material properties of the sheet. The amplified vibration, consequently, results in the heavy weight floor impact noise exceeding the sound level limit for an apartment house, 50dB. In this study, the amplification mechanism is examined through numerical analysis and a new slab system is proposed to reduce the amplification and control the noise. The new slab system consists of studs connecting the base slab and upper concrete finishing yielding the dramatically increased stiffness of the slab. The numerical simulation is performed to investigate the effect of the slab system with studs on the vibration and noise control. The results show that the performance of the slab is sensitive to the number and location of studs, and the heavy weight floor impact noise can be reduced up to 6-7dB compared to the conventional slab system at the optimal stud location.

• 한국세라믹학회지
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• 제41권3호
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• pp.221-228
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• 2004

국내에서는 최근 구조물 증축에 필요한 경량골재를 중국 및 일본 등에서 수입해 사용하고 있는 실정이고, 환경오염에 대한 관심 또한 고조되면서 폐기물의 처리, 처분 문제가 심각하게 대두되고 있다. 이에 순수 국내 기술로 폐기물과 점토질 원료를 습식혼합, 로터리 킬른에서 소성하여 인공경량골재를 제조한 후 기본 물성을 평가하였고 경량콘크리트에 적용하여 강도특성을 고찰하였다. 인공경량골재의 절건비중은 1.4～1.7, 흡수율은 13～16%이었으며, 파쇄율은 약 30～55%로 강자갈이나 쇄석과 비교하여 10% 이상 높은 수치를 나타내었고 파쇄 형상에서도 차이를 보였다. 골재를 2mm 이하로 분쇄하여 TCLP 용출시험 후 추출된 여액을 ICP-AES로 분석한 결과, 검출한계 이하 또는 용출량 기준치 이하로 용출되었다. 제조된 인공경량골재를 사용한 경량콘크리트 공시체를 제작하여 슬럼프, 압축강도, 휨파괴변형 특성을 시험하였다. 시험 결과, 인공골재 치환율 30vo1%, 물시멘트비 45wt%인 공시체에서의 슬럼프 및 압축강도 특성이 가장 우수하였다. 경량골재 콘크리트의 슬럼프 및 압축강도 시험결과를 통해 도출된 최적배합을 바탕으로 경량콘크리트 패널을 제작하여 단열 및 차음특성을 시험한 결과, 평균 열관류율은 3.293W/$m^2$$^{\circ}C$로 쇄석콘크리트에 비해 약 15% 우수하였으며, 음향투과손실은 500Hz에서 50.9㏈로 기준치를 약 13% 상회하는 결과를 보였다.