• Title/Summary/Keyword: cellular concrete

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A Study on the Development of the Prefoamed Lightweight Cellular Concrete using Expansive Admixture for On-Dol system Floor (팽창성 혼화제를 이용한 온돌단열용 경량기콘크리트의 제조 및 생산 시스템에 관한 연구)

  • 정성철;김범수;김기동
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.825-830
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    • 1999
  • The purpose of this study is to improve overall performance of prefoamed lightweight cellular concrete for On-Dol system floor. This study includes 4 sections as follows. \circled1 Analysis of the structural characteristics of On-Dol System focusing on the lightweight cellular concrete insulation layer. \circled2 Establishment of the mixing design equations. \circled3 Development of some admixtures used with foaming agent. \circled4 Improvement of the equipment for onsite production. This study has proven that, compared with the current existing one, the newly developed lightweight cellular concrete has been reduced the usage of cement by 20% and the cracks caused by cement drying shrinkage up to 80% but has shown the increased compression strength by 20% at 7 days curing period. The volume contraction of freshly prepared cellular concrete by the loss of foam was hardly found in newly developed lightweight cellular concrete.

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Properties of Sandwich Panel Using Cellular Concrete (기포콘크리트를 사용한 샌드위치 패널의 특성)

  • Jung, Yong-Wook;Jang, Seck-Soo;Lee, Seung-Han
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.845-848
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    • 2006
  • This study sought to investigate the characteristics of cellular concrete, such as porosity, strength and density, according to the cell addition rate. Based on the result, it examined the application to a cellular concrete panel. Porosity was found to increase according to the cell addition rate, measuring continuous porosity of 42% and 47%, and total porosity of 61% and 66%. In terms of cell addition rate, measurements were 7% and 11% respectively. Compressive strength represented 5.0MPa, 3.8MPa and 2.8 MPa in terms of 7%, 9% and 11% respectively, decreasing 1 MPa of strength according to every 2% increase of cell addition rate. Density showed 0.55, 0.44 and 0.36 in terms of 7%, 9% and 11% respectively, decreasing 1.0 MPa according to every 2% increase of cell addition rate proportionally. In addition the sandwich panel of cellular concrete which was fabricated during this research was found to be relatively heavy and non-flammable with an excellent strength of 4.0 MPa. Compared with a light concrete panel, considering the compressive strength that accountsfor 10 MPa, it appeared relatively low in strength. However it would be excellent for application due to the light density of only 0.4 MPa.

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A Plan to guarantee quality of Light-weight Cellular Concrete for floating floor (뜬바닥용 기포콘크리트의 품질확보 방안)

  • 이성호;정갑철
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.938-943
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    • 2003
  • The characteristics of lightweight cellular concrete has much influence on the compressive strength and flow from the design of mixture. This study is to investigate the characteristics of the compressive strength and flow for the mixture of lightweight cellular slurry. KS F 4039 was compared to the construction system and quality for lightweight cellular comcrete of floating floor. As the result of this study, the standard of the compression strength for target slurry have to lower and an upper limit of flow was judged to be 230mm

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Effect of Foaming Agent on the Continuous Voids in Lightweight Cellular Concrete (경량기포콘크리트의 연속공극 형성에 미치는 기포제의 영향)

  • 이승한
    • Journal of the Korea Concrete Institute
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    • v.14 no.5
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    • pp.742-749
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    • 2002
  • This study was performed to clarify the formation procedure of continuous voids in cellular concrete, and to examine the effect of a foaming agent on the manufacture of cellular concrete with continuous voids. By the experiments, it was determined that cellular concrete to be formed with continuous voids is influenced by temperature, viscosity and flowability of cement paste, and stability of air voids, and is formed in accordance with cohesion of air voids. It was also found that separate voids are formed at an added amount of air voids corresponding to 2 % or less of the amount of cement, whereas an antifoaming phenomenon occurs when the added amount of air voids exceeds 9 % of the amount of cement. In products with respective cement fineness of 3,000, 6,000, and 8,000㎠/g, a higher compressive strength was exhibited at a higher cement fineness. The continuous void ratio depending on a variation in fineness was 38 %, 52 %, and 22 % in those products, respectively. That is, a highest continuous void ratio was exhibited at a cement fineness of 6,000㎠/g. When the water-cement ratio was reduced from 45% to 25%, the compressive strength of the cellular concrete was increased from 15 kgf/㎠ to 20 kgf/㎠ Thus, the reduction in water-cement ratio was effective in achieving an increase in strength without any variation in the specific gravity of the cellular concrete.

A Study on the Sound Absorption Properties of Cellular Concrete with Continuous voids (연속공극을 갖는 기포콘크리트의 흡음특성에 관한 연구)

  • Lee, Seung-Han;Jung, Yong-Wook;Park, Jung-Jun
    • Journal of the Korea Concrete Institute
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    • v.15 no.4
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    • pp.566-573
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    • 2003
  • This study was performed to manufacture a rigid sound absorbing material by increasing the continuous void ratio of cellular concrete, thereby achieving an increase in sound absorption ratio and an enhancement in strength of the cellular concrete. By the experiments, it was determined that an increase in sound absorption ratio is achieved by increasing the added amount of air voids, thereby increasing the continuous void ratio. When the material had a thickness of 5 cm, a satisfactory average sound absorption ratio of 70% was obtained at a continuous void ratio of 40% or more. An increase in the thickness of the sound absorbing material resulted in an increase in sound absorption ratio in a super bass range. The specific gravity of cellular concrete meeting an average sound absorption ratio of 70% was 0.4 at a material thickness of 5 cm, and 0.6 or less at a material thickness of 7 cm. The compressive strength of the cellular concrete having a specific gravity of 0.4 meeting an average sound absorption ratio of 70% or more was 1.37 Mpa at a cement fineness of 3,000. This compressive strength was increased to 3.34 MPa at a cement fineness of 8,000. Accordingly, it was determined that the compressive strength of cellular concrete having continuous voids increases with a higher cement fineness.

Effect of Metakaolin on the Strength Properties of Lightweight Aggregate Cellular Concrete (경량골재기포콘크리트에서의 메타카올린 강도 증가 효과)

  • Hwang, Eun-A;Lee, Haeng-Ki
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.489-490
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    • 2009
  • In this study, the experiment was carried out to investigate the effect of metakaolin on the compressive strength of lightweight aggregate cellular concrete. For this purpose, five level replacement ratio of metakaolin were selected.

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Development of Non-flammable exterior design Molding using Cellular Light-weight Concrete (CLC를 활용한 공동주택 불연성능 외벽몰딩 개발)

  • Kwon, Hae-Won;Gong, Min-Ho;Lee, Chang-Yong;Jeong, Gab-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.54-55
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    • 2020
  • Recently, "The rules on the standards of evacuation and fire protection of buildings" require that non-burnable materials such as non-combustible and semi-non-combustible materials be used as the materials applied to the building's exterior walls, but styrofoam, which is a combustible material, has been applied a lot and became a social issue. In this study, we developed a non-combustible outer wall molding to secure construction and economic feasibility and free expression using CLC(CLC: Cellular Light-weight Concrete).

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Numerical analysis of the thermal behaviors of cellular concrete

  • She, Wei;Zhao, Guotang;Yang, Guotao;Jiang, Jinyang;Cao, Xiaoyu;Du, Yi
    • Computers and Concrete
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    • v.18 no.3
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    • pp.319-336
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    • 2016
  • In this study, both two- and three-dimensional (2D and 3D) finite-volume-based models were developed to analyze the heat transfer mechanisms through the porous structures of cellular concretes under steady-state heat transfer conditions and to investigate the differences between the 2D and 3D modeling results. The 2D and 3D reconstructed pore networks were generated from the microstructural information measured by 3D images captured by X-ray computerized tomography (X-CT). The computed effective thermal conductivities based on the 2D and 3D calculations performed on the reconstructed porous structures were found to be nearly identical to those evaluated from the 2D cross-sectional images and the 3D X-CT images, respectively. In addition, the 3D computed effective thermal conductivity was found to agree better with the measured values, in comparison with the 2D reconstruction and real cross-sectional images. Finally, the thermal conductivities computed for different reconstructed porous 3D structures of cellular concretes were compared with those obtained from 2D computations performed on 2D reconstructed structures. This comparison revealed the differences between 2D and 3D image-based modeling. A correlation was thus derived between the results of the 3D and 2D models.

Pilot Study on the Shear Strengthening Effect of Concrete Members Reinforced by Kagome Truss (카고메 트러스로 보강한 콘크리트 부재의 전단 보강효과에 관한 기초 연구)

  • Kim, Woo;Kang, Ki-Ju;Lee, Gi-Yeol
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.4A
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    • pp.237-244
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    • 2012
  • There is mounting recognition among concrete researchers that fiber reinforcement makes up for the inherent weakness in resisting tensile force of structural concrete. In practice of application of the fiber to concrete, however, several problems still remain to solve for assuring a uniform mix quality. The Kagome truss that is widely used in mechanical engineering field seems to be a good replacement for the steel fiber. This paper presents the test results of a pilot study for the concrete members reinforced by Kagome truss which is a periodic cellular metal of wire-woven. Three types of Kagome truss bulk were prefabricated and filled with normal concrete to make small-scaled test beams. The beams reinforced by a normal steel stirrups were also tested up to failure to compare the behavioral results. From the results obtained, it is appeared that comparing with beams reinforced by normal stirrups, the beams reinforced by Kagome truss showed better performance in load carrying capacity as well as ductility. Therefore, the Kagome truss is proved to be a good web shear reinforcing material.

Dispersibility and Flexural Toughness Evaluation of Fiber Reinforcement Cellular Sprayed Concrete by added Foam (기포를 혼입한 섬유보강 셀룰러 스프레이 콘크리트 공법의 분산성 및 휨인성 평가)

  • Lee, Kyeo-Re;Han, Seung-Yeon;Nam-Gung, Kyeong;Yun, Kyong-Ku
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.6
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    • pp.4192-4200
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    • 2015
  • In this paper, dispersibility of steel fiber is improved mixing with form for material development of protection and blast resistant structure sprayed concrete. And it is developed a high toughness cellular sprayed concrete material using steel fiber. Oversupply form for dispersibility improvement of steel fiber is mostly fade away through sprayed, finally it is satisfied with the proper mixing ratio under 3 % ~ 6 %. This is considered for compressive strength and flexural toughness. Test results of compressive strength showed superior strength capability in 28, 56 days, also flexural strength and flexural toughness is great. Then oversupply form is enhanced for dispersibility of steel fiber and I think that it did not cause decreasing of strength. But analysis results of pore structure through image analysis failed for a great spacing factor and specific surface area. This is largely measured in spacing factor because air content have a grate evaporation effect for sprayed.