• Proceedings of the Korean Society of Disaster Information Conference
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• 2016.11a
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• pp.183-185
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• 2016

본 연구에서는 불연성 무기단열재 제조를 위해 재료의 치환으로 열전도율을 충족시켜 경량 무기단열재 개발을 위해 연구하였다. 단열재로도 쓰이지만 화단의 흙을 대신하여 쓰이는 펄라이트 2종류와 바인더를 배합하여 샘플 3개를 제작하였다. 3가지 샘플들을 완전건조 후 열전도 측정기인 HFM-435를 이용하여 열전도율을 측정하였다. 펄라이트와 흑요소 펄라이트 두가지 재료를 혼합하여 만든 총 3개의 샘플의 열전도율을 측정하여 열전도 효율이 좋은 재료를 사용하여 단열재를 제작하고 각 재료들의 단열 특성에 관하여 분석하였다.

• Journal of Bio-Environment Control
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• v.5 no.1
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• pp.15-22
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• 1996

Cucumbers(Cucumis sativus L. CV. SHARP 1) were cultivated by bag culture for 5 months to investigate the effect of substrates on growth, yield, and mineral contents. The substrates used in the experiment were vermiculite + perlite +peatmoss(1:1:1=V:V:V), perlite+peatmoss(1:1=V:V), perlite+carbonized chaff(7:3=V:V), rockwool, sawdust, and chaff+chaff powder under 10 mesh (7:3=V:V). The rate of moisture content was highest at chaff powder under 10 mesh as 42.5% and was lowest at perlite+carbonized chaff as 31%. Plant height, No. of leaves, fresh and dry weight were increased in vermiculite+perlite+peatmoss(1:1:1=V:V:V). Marketable fruits and yield also showed same aspect with growth. All kinds of mineral contents except K in cucumber plants were higher at vermiculite+perlite+peatmoss(1:1:1=V:V:V), but K content was higher at perlite+ carbonized chaff(7:3=V:V) than those other substrates.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.11a
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• pp.217-220
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• 1999

수경재배중 고형배지 재배에서 주로 이용되어 왔던 배지로는 펄라이트, 암면, 질석, 폴리우레탄(PUR) 및 코코피트 등이 있다. 이중 펄라이트와 암면의 재배면적은 1998년에 전체 수경재배면적 553.4ha에서 각각 275.2ha와 163.1ha의 높은 점유율을 나타내고 있다. 이와 최(1998)은 수경재배 배지로 펄라이트와 암면이 가장 가능성이 높다라고 하였으며, Wilson(1986)도 토마토와 오이 수경재배에 있어서 가장 이상적인 배지는 펄라이트라고 하였 다. (중략)

• Journal of Bio-Environment Control
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• v.5 no.1
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• pp.7-14
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• 1996

This experiment was carried out to investigate the growth and yield responses of hydroponically grown tomato as affected by the different substrates using perlite and mixtures with perlite. Substrates used in this experiment were perlite (fine and coarse granule), peatmoss, rice hull and carbonized rice hull. The results obtained were as follows ; The best results in terms of total fruit yield and average fruit weight obtained in the single treatment of perlite, followed by perlite mixture with rice hull and carbonized rice hull. Leaf area was also higher in the plots of perlite mixture and optimum mixing ratio of perlite, peatmoss and carbonized rice hull was determined as 5:3:2 by volume. The more the rice hull was added to the mixed substrates, the less in fruit production was observed. However, adding perlite to other substrates brought higher fruit yield. Single treatment of rice hull showed the lowest fruit yield but enhanced in soluble solids contents over 6.0 $^{\circ}$Brix at each cluster.

• Journal of Bio-Environment Control
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• v.6 no.2
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• pp.80-85
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• 1997

This study was conducted to select useful medium material as a replacement for the rockwool in long term bag-culture of sweet pepper. The sole use of perlite and carbonized rice hull(CRH) as well as their mixture with various combinations were compared to the rockwool. The results are summarized as the followings : 1. Plant height and number of leaves did not significantly differ among media. However, in the mixture of CRH(1) : Perlite(1), stem diameter was thicker; plant weight and root weight were heavier, and T/R ratio was lower. 2. Although fruit length and number of fruits did not significantly differ among media, the mixture of CRH(1) : Perlite(1) provided longer fruit length, more fruits, heavier fruit weight, and greater yield. 3. Monthly yield was continuously increased from the first harvest in November to the harvest in May next year. The amount of increase in the fruit yield of the mixture of CRH(1) : Perlite(1) from the first harvest to the final harvest was significantly greater than the amount of increase of other media. 4. The amount of total nitrogen and phosphate was higher in mixture of CRH (1) : Perlite(1), while the amount of other elements did not significantly differ among mixtures.

• Elastomers and Composites
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• v.46 no.2
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• pp.164-170
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• 2011

In this study, silicone rubber filled with environmentally-friendly perlite was prepared by mechanical mixing in order to improve thermal properties, such as heat and fire resistances. We found that the properties of silicone rubber composites depended on perlite concentration by various characterization methods. Thermogravimetric analysis(TGA) indicated that the initial degradation temperature of silicone/perlite composite was higher than that of pristine silicone rubber. The gas torch test showed that the opposite side temperature of composite materials was remarkably low as compared to that of pristine silicone rubber. In addition, the composites containing 5 wt% and 10 wt% of perlite showed remarkable thermal stability at elevated temperatures according to the results of both fireproof furnace tests under the RABT condition and carbonization furnace tests. The images from a scanning electron microscope(SEM) showed the degree of dispersion of perlite in silicone rubber. Finally, it was confirmed that limited oxygen index(LOI) was increased with perlite concentration.

• Weed & Turfgrass Science
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• v.3 no.1
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• pp.19-28
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• 2014

Research was initiated in greenhouse to investigate effects of polymer, calcium, perlite and chitosan on the growth of Kentucky bluegrass (KB). A total of 24 treatment combinations were used in the study. Treatments were made of water-swelling polymer (WSP), calcium, perlite, and chitosan in soil organic amendment (SOA). Significant differences were observed in germination rate, turfgrass coverage, turfgrass density and top growth among treatments. Germination rate, density and plant height varied with time after seeding. A proper mix of WSP is considered to be lower than 3% for turfgrass coverage and density. Regarding survival capability and top growth, however, it was good under 6%. Overall KB growth was more influenced by calcium and perlite than chitosan. Calcium and perlite were the most effective elements for early survival capacity and turfgrass density, respectively. But no effect was found by chitosan. Top growth increased with three elements, being perlite > calcium > chitosan. The chitosan was effective in early germination, but there was no effect on top growth until 3 weeks, when compared with others. A further study is needed for investigating the effect of these materials on the growth characteristics in mixtures of sand and SOA before a field application.

• Horticultural Science & Technology
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• v.35 no.1
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• pp.30-37
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• 2017

This study was conducted to determine the effects of various growth substrates on the growth and flowering of hydroponically grown Freesia hybrid 'Gold Rich'. Perlite, peat moss and a perlite: peat moss mixture (1 : 1 ratio, v / v) were used as the growing media. The greatest plant height before flower bud differentiation was attained using mixed medium compared to the others. The type of medium used did not influence leaf number, mineral content or SPAD value in leaves. Flowering began at 137 days after planting in mixed medium, which was 13 days earlier than in perlite medium. The whole plant fresh weight was 21.3 g heavier in mixed medium than in perlite medium (40.9 g). A similar result was obtained for shoot length, with the highest value (96.6 cm) obtained in mixed medium, i.e., 20 cm higher than in perlite medium (76.6 cm). Floret number per plant was also the highest in mixed medium (14.4), i.e., 1.7 - times higher than in perlite medium. Therefore, among the substrates tested in this experiment, we recommend using mixed perlite: peat moss medium (1 : 1 ratio, v / v) for hydroponic culture of freesia, as the use of this medium improved the physical properties of the plants, producing the best results in terms of plant growth and cut-flower quality.

• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.154-154
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• 2011

최근 세계 각지에서 발생하는 대규모 터널 화재사고는 많은 사상자를 동반하고 이에 따른 경제적, 사회적 손실 또한 방대하게 진행되는 실정이다. 터널 구조물의 화재 특성상 외부에 쉽게 노출되지 않기 때문에 화재 발생 시 화재에 노출된 표층이 박리되거나 비산해서 단면결손이 생기는 폭렬 현상(explosive spalling)이 발생하게 된다. 이러한 폭렬 현상은 붕괴와 같은 대형 참사로 이어질 가능성이 크다. 따라서 본 연구에서는 터널 내 화재 발생 시 콘크리트 구조물의 폭렬에 의한 붕괴를 예방하기 위하여 이액형 상온경화 실리콘 고무와 인체에 무해한 친환경 첨가제인 펄라이트를 일정한 혼합비(5wt%, 10wt%, 15wt%, 20wt%)로 혼합하여 고성능 난연 복합체를 제조하고, 열적 특성과 난연 특성을 연구를 진행하였다. 열적 특성에 관한 시험으로 TGA를 측정하였으며, 난연 특성에 관한 시험으로는 화염 시험, 내화로 시험, 탄화로 시험을 진행하였다. 우선 TGA 시험은 $20^{\circ}C/min$ 승온 속도로 $800^{\circ}C$까지 실험을 하였고, 화염 시험은 제작한 시편과 gas torch($1200^{\circ}C$)의 화염 거리를 약 10cm로 하여 약 1시간 동안 시험을 하였다. 내화로 시험은 내화로 장치를 이용하여 RABT curve(5분만에 $1200^{\circ}C$도달 후 한 시간 동안 유지 후 냉각, 총 시험 시간 180분) 조건을 만족하는 환경에서 제작한 시편을 콘크리트에 부착하여 콘크리트의 내부온도를 측정하였다. 탄화로 시험은 탄화로 장치를 이용하여 $2^{\circ}C/min$ 승온속도로 $900^{\circ}C$까지 실험을 하여 외부 형태 변화를 관찰하였다. 각각의 시험 결과 TGA 열분해 결과 순수한 실리콘 고무보다 난연제인 펄라이트를 첨가했을 때 더 높은 온도에서 초기 분해 거동을 보였으며, 최종 잔류량은 80%를 보였고, 5 wt%의 펄라이트가 혼합된 시편의 최종 잔류량이 높은 것으로 보아 열분해에 가장 강한 조성임을 알 수 있었다. 화염 시험 결과 펄라이트가 혼합된 모든 시편에서 $300^{\circ}C$가 넘지 않은 결과를 보였다. 이는 제조된 복합체가 화염에 직접적으로 장시간 노출이 되어도 안전하다는 것을 알 수 있다. 내화로 및 탄화로 시험 결과 펄라이트가 15wt%와 20wt%가 첨가된 시편들보다 5wt%와 10wt% 첨가된 시편들이 고온에서 안정하다는 것을 보였다.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.04a
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• pp.106-109
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• 2002

우리나라에 널리 보급ㆍ이용되고 있는 양액재배방식중 하나는 펄라이트경이며 대부분 비순환식이다. 펄라이트 재배에서의 적정 양액조성, 양액관리기술 및 배지내 환경조건에 관한 연구가 꾸준히 이루어지고 있다. 한편 적정 수분관리는 작물의 생장뿐만 아니라 경제적, 환경적 측면에서 대단히 중요하다. 따라서 생육단계 및 재배시기별로 급액량을 달리하고 있지만 아직은 비효율적인 측면이 있어 양액소모량이 더 많다. (중략)