• Title/Summary/Keyword: cement panel

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Thermal Properties of the Cement Extruding Panel with Waste concrete Powder (폐 콘크리트 미분을 혼입한 시멘트 압출성형 패널의 열적특성)

  • Choi, Duck-Jin;Hong, Sung-Rog;Lee, Min-Jae;Kim, Jang-Yup;Kim, Jin-Man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.283-286
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    • 2012
  • According to increase of the waste concrete occurrence, recycling has being important more and more. This study is to recycle the waste concrete powder, which is occurred in dry-process during recycling of construction waste. We have tried the waste concrete powder to apply as the replacement of the silica powder in cement extruding product. As a result, it is satisfied that the autoclave cured pannel of 50% replacement ratio of waste concrete powder staisty the level of the flexural strength of 14MPa stipulated by "KS F 4735 Extruding concrete panel" was the same thermal properties as base specimen.

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Improvement of Drainage Material for Attached Algae Growth Control in Sedimentation Basin (부착성장 조류 제어를 위한 침전지 배수로의 재질개선에 관한 연구)

  • Jun, Dae-Young;Lim, Byung-Ran;Yu, Hyun-Sun;Cho, Jin-Woo;Hwang, Jong-Hyuk;Ahn, Kyu-Hong
    • Journal of Korean Society of Water and Wastewater
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    • v.19 no.2
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    • pp.193-199
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    • 2005
  • The objective of this study was to investigate the characteristics of adhesion and detachment of algae on various materials of drainage canal in the sedimentation basin. The influence of surface washability, surface roughness, phosphorous concentration was studied using stainless steel, cement block and ceramic panel. The algae attached content of cement block was higher than that of the ceramic coating panel. The attachment varied significantly with respect to exposure time and different materials. the attachment was higher on rough surface (cement block) when compared to smooth surfaces. The content of attached algae increased with increasing phosphorous concentration in water. The detachment efficient of algae was higher on ceramic panel.

Heating Value and Noxious Gases Generation of Sandwich Panel Core using Artifical Lightweight Aggregate (다공성 경량골재를 충전재로 활용한 샌드위치 패널 심재의 발열량 및 유해가스 배출특성)

  • 노정식;도정윤;문경주;조영국;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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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.

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Experimental Review on Application of Lightweight UHPC as Repair Mortar and Cement Panel (경량 UHPC의 보수용 모르타르 및 시멘트 패널로서의 활용 가능성에 대한 실험적 검토)

  • Jae Sung Ahn;Hyeong-Ki Kim
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.11 no.3
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    • pp.210-217
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    • 2023
  • Various performances of ultra-high performance concrete (UHPC) applied with microplastics and expanded polystyrene (EPS) beads were evaluated. CompressIve and flexural strength, performance after ignition, flow-down in fresh state, and effective bond strength were evaluated. Designed weight of the cement panel with these mixtures was calculated based on the flexural strength. As a result of the experiments, it was confirmed that the EPS could reduce the density of UHPC with largest range. By maximum addition of EPS beeds, the density of UHPC decreased to 1300 kg/m3, and the compressive and flexural strengths for this mixtures were in ranges of 20-30 MPa and 15-20 MPa, respectively. On the other hand, lightest cement panel could be designed with UHPC having a density ranges about 2.0 g/cm3.

Property of Thermal Conductivity of Light Weight Panel Core Using Light-Weight Aggregate (인공경량골재를 이용한 경량패널 심재의 열전도 특성)

  • 이정국;도정윤;문경주;조영국;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.131-136
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    • 2002
  • In recent year, it has been investigated on the reduction of mass of structures for the purpose of the larger space and the economy with the industry developing very fast and qualitatively. So the purpose of this study is to investigate the manufacture of light weight concrete panel using the artificial light-weight aggregate as a part of the substitution of foamed styrene and polyurethane because of narrow allocable temperature zone in use. The compressive strength, flexural strength, unit weight, absorption test and thermal conductivity were practised at 3, 7 and 28 days after manufacturing the light-weight concrete lot the panel core: the filling ratio of continuous void was defied as 40%, 50%, and 60% and water-cement rate was 35, 40 and 45%. As a result of this, it was revealed that the mixture derived from filling ration of void of 50% and water-cement ratio 40% were developing the best properties of the others.

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An Experimental Study on the Sound Insulation Characteristics of Heavyweight Walls (중량벽체의 차음특성에 관한 실험적 연구)

  • 김선우;이태강;송민정
    • Journal of KSNVE
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    • v.8 no.6
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    • pp.1078-1085
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    • 1998
  • This study is carried out to investigate the characteristics of sound insulation performances for masonry walls. PC walls and ALC walls. For these purposes. 17 types of masonry walls were selected and tested in accordance with KS F 2808 at reverberation room The sound insulation performance of 8" cement block walls are graded with D-45 ∼ D-55 which are to be evaluated very favorable grade. 4" cement block walls are D-30 ∼ D-40. 1 B cement brick walls are D-40∼D-50 favorable grade. 0.5 B brick walls are D-30∼D-45. 150 mm PC wall is D-50. and ALC walls(150 mm, 200 mm) are D-30∼D-45.

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Development of A Cement Mill Control System (시멘트 분쇄설비의 자동제어 시스템 개발)

  • Ju, Sang-Wook;Hwang, Hu-Mor
    • Proceedings of the KIEE Conference
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    • 1998.07g
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    • pp.2420-2423
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    • 1998
  • We developed a cement mill control system to improve performances of cement mill and conveyance facilities in view of TPM(Total Productive Maintenance). The system replaces the conventional sequence control relay panel and the mimic panel by the PLC(Programmable Logic Control) and the operation station with a monitor, respectively. In addition, the updated A3A CPU is added to the melsec PLC. All networks of the system are operated through ethernet communications. This system as a domestic product is setup at S company and outperforms other foreign products in views of operation efficiency and process stability.

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Study on the Fire Resistance of Light Weight Inorganic Polymer Concrete Panel Wall (Inorganic Polymer Concrete를 이용한 경량패널의 내화특성에 관한 실험적 연구)

  • Hwang, Ji-Soon;Kim, Woo-Jae;Kim, Dae-Hoi;Park, Dong-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.205-206
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    • 2011
  • Inorganic Polymer Concrete, a type of Alkali activated cement and concrete, is known for various excellent performances, especially for better performance in the area of high temperature heat resistance(thermal characteristic) than portland cement concrete.In this study, light weight concrete panel was manufactured using this Inorganic Polymer Concrete and then evaluated for fire resistance with a small-scale heating furnace. Since the result showed excellent fire resistance, it is considered usable for manufacturing fire resistant concrete panel wall.

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Properties of St/BA Modified Cellular Lightweight Concrete as Sandwich Panel Core (샌드위치패널심재로 활용한 St/BA 개질 다공성 경량 콘크리트의 특성)

  • 강내민;노정식;도정윤;문경주;소양섭
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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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.

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A Study on the Performance Evaluation of Form Using the Aluminum Alloy Frame Reinforced Panel (Aluminum 합금재 Frame을 이용한 벽체거푸집공법의 성능평가에 관한 연구)

  • 안재철;오상균;강병희
    • Journal of the Korea Institute of Building Construction
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    • v.1 no.1
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    • pp.135-142
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    • 2001
  • This study is for the investigation of form using the aluminum-compound metal frame(Aluminum frame reinforced panel : AFR panel) which is improved in the capacity in the wall-concrete structure in steal of using the existing form which has problems such as, excessive exposure of cement, the loss of labor when it is constructed or disjointed, and it's economical efficiency compared with that of EURO Form. AFR panel passes the KS F 8006 test, and as a result of field test, it's displacement is satisfied with Specification. And using AFR panel is more economical than that of EURO Form because saving labor cost which plays a major part in cost saving in formwork is more effective in retrenching total cost than increment of material cost.

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