• Title/Summary/Keyword: lightweight foamed concrete

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A Experimental Study on the Physical properties of Lightweight Foamed Concrete Using Mineral Foam Agent (광물성 기포제를 이용한 경량기포콘크리트의 물리적성질에 관한 실험적 연구)

  • You, Jei-Jun;Lee, Han-Seung;Bae, Kyu-Woong;Lee, Sang-Sup;Yeon, Gyu-Bong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.11a
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    • pp.49-52
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    • 2003
  • The objective of this study the mechanical characteristics of prefoamed lightweight foamed concrete using the mineral foam agent which has high lightness, and strength. The compressive strength of lightweight foamed concrete using mineral foam agent are about 2 times degree high those the of lightweight foamed concrete using vegetable foam agent. Lightweight foamed concrete was able to obtain the result of 50kg/㎠ or more compressive strength, when was unit weight 0.8t/㎡. In the case of the same unit weight of concrete, it is influenced by w/c of foam agent ratio. The paper present extensive data on characteristics of compressive strength of the concrete manufatured with the different factors in mix design and also present optimum mix proportion.

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A Experimental Study on the Physical properties of Lightweight Foamed Concrete Using Mineral Foam Agent (광물성 기포제를 이용한 경량기포콘크리트의 물리적성질에 관한 실험적 연구)

  • 유제준;이한승;배규웅;이상섭;연규봉
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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    • pp.49.1-52
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    • 2003
  • The objective of this study the mechanical characteristics of preformed lightweight foamed concrete using the mineral foam agent which has high lightness, and strength. The compressive strength of lightweight foamed concrete using mineral foam agent are about 2 times degree high those the of lightweight foamed concrete using vegetable foam agent. Lightweight foamed concrete was able to obtain the result of 50kg/$\textrm{m}^3$ or more compressive strength, when was unit weight 0.8t/$\textrm{m}^3$. In the can of the same unit weight of concrete, it is influenced by w/c of loan agent ratio. The paper present extensive data on characteristics of compressive strength of the concrete manufactured with the different factors in mix design and also present optimum mix proportion.

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Ultimate moment capacity of foamed and lightweight aggregate concrete-filled steel tubes

  • Assi, Issam M.;Qudeimat, Eyad M.;Hunaiti, Yasser M.
    • Steel and Composite Structures
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    • v.3 no.3
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    • pp.199-212
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    • 2003
  • An experimental investigation of lightweight aggregate and foamed concrete contribution to the ultimate strength capacity of square and rectangular steel tube sections is presented in this study. Thirty-four simply supported beam specimens, 1000-mm long, filled with lightweight aggregate and foamed concretes were tested in pure flexural bending to calculate the ultimate moment capacity. Normal concrete-filled steel tubular and bare steel sections of identical dimensions were also tested and compared to the filled steel sections. Theoretical values of ultimate moment capacity of the beam specimens were also calculated in this study for comparison purposes. The test results showed that lightweight aggregate and foamed concrete significantly enhance the load carrying capacity of steel tubular sections. Furthermore, it can be concluded from this study that lightweight aggregate and foamed concretes can be used in composite construction to increase the flexural capacity of the steel tubular sections.

An Experimental Study on the Performance Evaluation of Lightweight Foamed Concrete According to Size and Replacing Ratio of Artificial Lightweight Aggregate (인공경량골재 크기 및 혼입량에 따른 경량기포콘크리트의 물리적 성능 평가에 관한 실험적 연구)

  • Jeong, Seong-Min;Yun, Chang-Yeon;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.162-163
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    • 2017
  • This study investigated the properties of lightweight foamed concrete by using synthetic foaming agent and artificial lightweight aggregate. The effects of artificial lightweight sizes on the compressive strength, density and pore structure of the concrete were investigated. The samples were assessed by MIP analysis and simultaneous SEM was used to study their pore distribution. This study showed the improvement of important properties of lightweight foamed concrete. Lower pore distribution and correspondingly higher compressive strength values were reached. This is for the purpose of providing basic data for the use of lightweight foamed concrete through improvement on the problem such as unstability, falling in fluidity and the strength of existed foaming agent.

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Development of Lightweight Foamed Concrete Using Polymer Foam Agent and its Mechanical Properties (경량기포콘크리트의 개발과 역학적 특성에 관한 연구)

  • 변근주;박상순;송하원
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.10a
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    • pp.358-365
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    • 1996
  • Lightweight foamed concrete is a concrete which is lighter than normal concrete by mixing prefoamed foam in cement slurry. The objective of this study are to develop prefoamed optimal lightweight foamed concrete using polymer foam agent and to obtain its mechanical characteristics experimentally. This paper presents extensive test data on young's modulus, poisson's ratio, stress-strain curve, the characteristics of strength of the foamed concrete and also presents the mechanical characteristics of the foamed concrete according to foam sizes.

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Development of Lightweight Foamed Concrete Using Polymer Foam Agent (고분자 기포제를 이용한 경량 기포 콘크리트의 개발(I))

  • 변근주;송하원;박상순
    • Magazine of the Korea Concrete Institute
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    • v.9 no.1
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    • pp.165-172
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    • 1997
  • Lightweight foamed concrete is a concrete which is lighter than conventional concree by mixing ptetoamed foam in cement slurry. The objectives of this study are to develop optimal prefoarneti lightweight foamed concrete with high lightness. high flowability and enough strength fol special use of structural application by using the polymer foam agent. By mixing the admixtures such as silica-fume and fly-ash and the industrial by-product such as styrofoam for the purpose of practical use of industrial waste, lightweight foamed concrete shich has better lightness. flowability and strength than the conventional prefoamed lightweight foamed concrete is developed. This paper presents extensive data on characteristics of compressive strength and flowability of the concrete manufactured with the different factors in mix design and also presents optimum mix proportion.

Influence of Rheological Properties of Lightweight Foamed Concrete on Preventing Foam Collapse (경량 기포 콘크리트의 레올로지 특성이 소포억제에 미치는 영향)

  • Lee, Hyang-Sun;Jeon, Jong-Woon;Jo, Mujin;Kee, Seong-Hoon;Han, Dongyeop
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.6 no.4
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    • pp.304-310
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    • 2018
  • The aim of the research is to provide possibility of quality controlling by rheological properties for lightweight foamed concrete. The lightweight foamed concrete achieves its low density by containing air bubbles (foam) produced during the mixing process. Therefore, containing foamed volume during setting period is critical for the securing the performance as an insulating material. In this research, regarding foam collapse during the setting period, rheolgocial properties of fresh state lightweight foamed concrete were assessed to get its relationship with volume stability, or foam stability. For the experiment regarding foaming factors including mixing time, mix design of contents for materials, rheological properties of fresh state lightweight foamed concrete were tested with its density and settling depth. Based on the settling depth with various factors, relationship with rheological properties was analyzed, and especially, close relationship of plastic viscosity and settling depth was found. Therefore, from the results of this research, it is considered to contribute on suggesting a new approach of quality controlling for lightweight foamed concrete using rheological test method.

The Fundamental Study on Thermal Conductivity with Variation Density of Light Weight Foam Concrete and Iron plate structure (경량기포콘크리트의 밀도변화에 따른 열전도 특성에 관한 기초적 연구)

  • Choi, Hun-Gug;Jung, Eun-Hye;Kang, Cheol;Lee, Eun-Young;Kim, Dae-Yeon;Kim, Jin-Man
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.849-852
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    • 2006
  • The lightweight foamed concrete is superior to properties of insulation and light-weight because it is included in many inner pore. So, lightweight foamed concrete used to construction field that need to property of insulation. The property of insulation of lightweight foamed concrete is varied with density. Also, Density is varied with hardening matrix and pore rate. The purpose of the experiment is to know thermal properties of specimen according to the change of density when heating the specimen. As a result of this experiment, the higher density, the lower temperature of mold. this tendency isn't same as ordinary lightweight foamed concrete, and then density 0.9 is expressed most low temperature result also the discontinuity of shape of mold was efficient for the prevention of the temperature rise.

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Carbonation Behavior of Lightweight Foamed Concrete Using Coal Fly Ash

  • Lee, Jae Hoon;Lee, Ki Gang
    • Journal of the Korean Ceramic Society
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    • v.53 no.3
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    • pp.354-361
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    • 2016
  • The purpose of this study was to prepare lightweight foamed concrete by mixing coal fly ash of circulating fluidized bed combustion(CFBC) with cement, and to develop uses for recycling by analyzing carbonation behavior resulting from a change in conditions for pressurized carbonation. For concrete, CFBC coal fly ash was mixed with Portland cement to the water-binder ratio of 0.5, and aging was applied at room temperature after 3 days of curing at $20^{\circ}C$, RH 60%. For carbonation, temperature was fixed at $60^{\circ}C$ and time at 1 h in the use of autoclave. Pressures were controlled to be $5kgf/cm^2$ and the supercritical condition of $80kgf/cm^2$, and gas compositions were employed as $CO_2$ 100% and $CO_2$ 15%+N2 85%. In the characteristics of produced lightweight concrete, the characteristics of lightweight foamed concrete resulting from carbonation reaction were affirmed through rate of weight change, carbonation depth test, air permeability, and processing analysis for the day 28 specimen. Based on these results, it is concluded that the present approach could provide a viable method for mass production of eco-friendly lightweight foamed concrete from CFBC coal fly ash stabilized by carbonation.

Experimental Study on the Heat Shielding Performance of Lightweight Foamed Concrete Using EPS beads. (EPS 비드를 사용한 경량기포콘크리트의 차열성능의 실험적 연구)

  • Hong, Snag-Hun;Song, Seung-Li;You, Nam-Gyu;Jung, Ui-In;Kim, Bong-Joo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.21-22
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    • 2018
  • Foamed concrete is a porous concrete that is cured by mixing bubbles into cement slurry. It is lighter than ordinary concrete and is characterized by higher insulation. Lightweight foamed concerte is mainly used as a sandwich panel in Korea, and is also used as a refractory filler in fireproof safes. Studies on lightwight foamed concrete have been carried out on strength,density and thermal conductivity. However, it is confirmed that the research on the fire resistance performance is very limited. Based on this study, fire resistance of lightweight foamed concrete using expanded polystyrene beads is investigated.

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