• Title/Summary/Keyword: cement extruding panel

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Fire-Resistance Property of Cement Extruding Panel Mixed with Alpha-Hemihydrate Gypsum (알파형 반수석고를 혼입한 시멘트 압출 패널의 내화특성)

  • Choi, Duck-Jin;Lee, Min-Jae;Shin, Sang-choul;Kim, Ki-Suk;Kim, Jin-Man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.109-110
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    • 2011
  • Gypsum is an important building material used to provide fire resistance to constructions by reducing their temperature rises. As the hardened gypsum is exposed to fire, evaporation of both the free water and the chemical bond water is easier than that in the cement extruding panel. The purpose of this study is to investigate the utilizability of alpha-hemihydrate gypsum to prevent spalling failure of cement extruding panel exposed to fire. This paper reports the fire-resistance property of a controled general cement extruding panel(C100), and gypsum-cement extruding panels(C50A50, A100) according to replacement ratio of alpha-hemihydrate gypsum. As a results, it is found that A100 and C50A50 are more effective to prevent the explosive spalling failure under standard fire condition than C100.

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Microstructure Properties of Cement Extruding Solid using Waste Concrete Powder (폐콘크리트 미분말을 사용한 압출경화체의 미시구조 특성)

  • Yu, Jae-Seong;Kim, Jin-Man;Sun, Jeong-Soo;Choi, Hong-Bum
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.55-56
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    • 2016
  • In the recent concrete industry, when producing recycled aggregates, waste concrete powder is by-produced in large quantities; however, since it is not used properly but buried or discarded. This study is to apply the waste concrete powder to a cement extruding panel as filler. Flexural strength and microstructure characteristics of panel is tested in order to improve the economics of the extruding panel. As a results of this study, it was found that extruding panel replacing silica(No.8) as the waste concrete powder totally showed little difference in the strength and satisfied the target flexural strength of 14MPa, comparing with controlled panel. In addition, we can understand that rich Portlandite and Calcite contributed to develop the strength in all curing conditions from XRD pattern.

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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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Properties of Extruding Cement Panel Using Ca-extracted Slag as Silicious Source (Ca 추출 슬래그를 실리카 원료로 사용한 압출성형시멘트 패널의 특성)

  • Choi, Hong-Beom;Kim, Jin-Man;Yu, Jae-Seong;Hyun, Ji-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.10a
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    • pp.117-118
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    • 2016
  • This paper evalutes properties of extruding cement panel using Ca-extracted convert slag and air-cooled blast furnace slag. Flexural strength of extruding cement panel has measured in air dry and autoclave curing as basic study for use as silicious source. As a result, when Ca-extracted converter slag replaces 25% in autoclave curing, flexural strength measures 13.1MPa better than panel control mix. In result of using air-cooled blast furnace slag, Ca-extracted air-cooled blast furnace slag dose not show increase of flexural strength.

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A Flexural Strength Properties of Extruding Concrete Panel Using Stone Powder Sludge (석분슬러지를 이용한 압출성형 콘크리트 패널의 휨강도 특성)

  • Choi Hun-Gug;Jung Eun-Hye;Kawg Eun-Gu;Kang Cheol;Seo Jung-Pil;Kim Jin-Man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.05a
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    • pp.115-118
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    • 2006
  • Nowadays the using of concrete is generalized, and construction material is demanded to be lightweight according to increasing the height and capacity of buildings. Therefore, it needs to develop the products having the great quality and various performance. Extruding concrete panel made of cement, silica source, and fiber, and it is a good lightweight concrete material in durability and thermostable. The silica of important ingredient is natural material with hish SiO2 contents and difficult in supply because of conservation of environment. On the other hand, the stone powder sludge discharged about 20-30% at making process of crushed fine aggregate and it is wasted. The stone powder sludge is valuable instead of silica ole because the stone powder sludge includes water of about 20-60%, SiO2 of about 64% and it has fine particles. This experiment is on the properties of extruding concrete panel using the stone powder sludge use instead of silica. From this experiment, we find that it is possible to replace the silica as stone power sludge up to 50%,

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Safety Evaluation of Fire Resistant Extruded Panel for Partition Wall System

  • Choi, Duck-Jin;Kim, Jin-Man
    • Journal of the Korea Institute of Building Construction
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    • v.12 no.6
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    • pp.586-595
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    • 2012
  • While the extruded cement panel has many advantages compared to drywall, it has limited applicability in buildings due to its low fire resistance. However, an extruded panel in which the fire resistance has been dramatically enhanced through the addition of a-hemihydrate gypsum is expected to become widely applied as a partition wall or interior material for buildings. To ensure its applicability, certain safety requirements for use, such as the leaning load by residents, the impact by indoor articles, and the fire, need to be taken into consideration. The purpose of this study is to review the impact load resistance, horizontal load resistance, and fire resistance as required safety properties for the partition wall and interior materials of the extruded panel that includes a-hemihydrate gypsum. The results of this study show that the impact load resistance of the extruded panel that includes a-hemihydrate gypsum achieves SD grade for industrial buildings, and the horizontal impact load resistance achieves HD grade for public buildings. In addition, it provides fire-resistance for approximately 7 minutes longer than the existing extruded cement panel. Based on this result, it is confirmed the extruded panel incorporating a-hemihydrate gypsum has adequate safety properties for use as partition wall or interior material.

Application of Waste Concrete Powder as Silica Powder of Cement Extruding Panel (시멘트 압출패널의 규사분말 대체재로서 폐콘크리트 미립분의 활용)

  • Kim, Jin-Man;Kim, Kee-Seok;La, Jung-Min;Choi, Duck-Jin
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.6 no.1
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    • pp.88-94
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    • 2011
  • To make recycling aggregate, quantity of fine particles increase due to multi-crushing. Though this particles were mixed with recycling aggregate, those have to be disparted from aggregate in the high quality recycling aggregate, because of the cause of low quality. Considering reactivity, fine particles is better than coarse one. Therefore, it needs to develop suitable usage. We try to make cement extruding material by using the fine particles from concrete recycling, as a silicious replacement. Test results are as follows ; 1) Waste concrete powder has major ingredients such as $SiO_2$ and CaO, its density is $2.45g/cm^3$ being similar to silica powder, its diameter is range 13 to $141{\mu}m$. 2) Considering to strength properties according to particle size, specimen was made using small particles is higher strength than large one. 3) Despite of exception in the autoclaved curing, when the replacement of waste fine particle increase, strength of extruding panel shows almost same level.

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Engineering Performance of Extruded Fly Ash Cement Panel with Bottom Ash (잔골재로서의 바텀애시를 사용한 플라이애시 시멘트 압출경화체의 공학적 특성)

  • Lee, Myeong-Jin;Kim, Jin-Man;Han, Dong-Yeop;Choi, Duck-Jin;Lee, Keun-Woo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.3 no.3
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    • pp.252-260
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    • 2015
  • The aim of this research is providing the fundamental data for treating and recycling the byproducts by using the wet processed bottom ash as a fine aggregate replacement for cement-based extruded panel. Although the cement-based extruded panel was used mainly as a cladding component with its high strength and outstanding durability, it was hardly spread because of low economic feasibility due to the high cost of additives or fibers which were used to achieve 14 MPa of flexural strength as a cladding material. As a solution of this drawback, by the previous research, it was possible to replace cement by fly ash up to 80 % by decreasing quality criteria with restricting the application to indoor purpose. In this research, based on the previous research, by using the bottom ash as a replacement of fly ash, improvement of shape retention performance is tried. As a result of the experiment on evaluating the optimum content and PSD of bottom ash, as the fineness modulus and content of bottom ash was increased, the extruding performance was decreased and penetration resistance was increased. Additionally, the optimum content and the maximum particle size was found as 20 %, and 0.3 mm, respectively.