• Title/Summary/Keyword: high flowing

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A Fundamental Study on the Mix Proportion of Base Concrete Influencing on the Workability and Engineering Properties of Flowing Concrete (유동화 콘크리트의 시공성 및 공화적 특성에 미치는 베이스콘크리트의 조합조건에 관한 기초적 연구)

  • 김무한;송하영
    • Proceedings of the Korea Concrete Institute Conference
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    • 1991.04a
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    • pp.29-32
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    • 1991
  • This is the study on the performance of workability and engneering properties of flowing concrete using the superplasticizers, which are being used for control of the consistency of fresh concrete without modifying the properties of the hardened concrete and for production of high quality concrete at a low water-cement ratio. It is the aim of this study to analyze and investigate workability and engineering properties of flowing concrete according to the addition rate in poor and rich mix proportions of base concrete. Base on this fundamental investigation for the development of flowing concrete mix design, it could be drawn that the workability and engineering properties of flowing concreteare influenced greatly by mix proportion and dosage of superplasticizers.

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An Experimental Study on the Flowability of Super Flowing Concrete (초유동콘크리트의 유동특성에 관한 실험적 연구)

  • 권영호;이상수;박연동;김진근;박칠림
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.10a
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    • pp.1-7
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    • 1995
  • In this paper, we decribed the basic elements required for the practical usage of super flowing concrete. The flowability and filingability of fresh concrete was measured by using six different testing methods. Also, two actual size members were used for investigating characteristics of the hardened concrete through variious experiments. As the result of the experimentation, the developed super flowing concrete shown high flowability and fillingability good enough for the requirement. Furthermore, inner uniformity of the no-vibrated concrete was verified by testing distribution of aggregates and core cylinders. Therefore, quality control and workability of concrete can be secured by using the super flowing concrete even without vibrating However, it ha been felt that development of easy evaluation methods for the super flowing concrete is in need.

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Flowing Ability and Mechanical Properties of Polypropylene Fiber Reinforced High Performance Concrete

  • Kim, Young-Ik;Sung, Chan-Yong
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.45 no.7
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    • pp.27-37
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    • 2003
  • This study was performed to examine the flowing ability and filling ability of polypropylene fiber reinforced high performance concrete. The slump flow was decreased with increasing the polypropylene fiber content, rapidly. At the box-type filling ability, the difference of box height was increased with increasing the fiber content and the box-type passing ability was closed in fiber content 1 %. The final flowing distance of L-type was decreased with increasing the fiber content. Also, it was decreased above 0.75% of polypropylene fiber content, rapidly. The filling ability of L-type was badly showed above polypropylene fiber content 0.75%. Also, the compressive strength was decreased with increasing the fiber content, but the flexural strength was shown higher than that of the concrete without fiber. At the impact resistance, drop numbers for reaching in final fracture were increased with increasing the fiber content. Also, the drop numbers for reaching initial fracture of 1mm were increased with increasing the fiber content. At the acid resistance, the percent of original mass was decreased with increasing the fiber content.

A study on the quality performances of the high flowing concrete for binder types (분체의 종류에 따른 고유동 콘크리트의 품질성능에 관한 연구)

  • 권영호;이현호;하재담
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.567-572
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    • 2002
  • This research investigates experimentally an effect on the quality performances of the high flowing concrete according to binder types. The purpose of this study is to determine the optimum mix proportion of the high flowing concrete having good flowability, viscosity and no-segregation. For this purpose, two types using belite cement+lime stone powder(LSP) and furnace slag cement+lime stone powder are selected and tested by design factors including water cement ratio, fine and coarse aggregate volume ratio. As test results of this study, the optimum mix proportion for binder types is as followings. 1) One type based belite cement ; water cement ratio $51^{\circ}C$, fine aggregate volume ratio $43^{\circ}C$ and coarse aggregate volume ratio $53^{\circ}C$, replacement ratio of LSP $42.7^{\circ}C$. 2) Another type based slag cement : water cement ratio $41^{\circ}C$, fine aggregate volume ratio $47^{\circ}C$ and coarse aggregate volume ratio $53^{\circ}C$, replacement ratio of LSP $13.5^{\circ}C$.

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A Field Study on the Manufacturing of High Fluidity Concrete by Flowing Method (유동화공법으로 제조한 고유동 콘크리트의 현장 부어 넣기 실험)

  • 한민철;김경민;홍상희;손성운;김성수;한천구
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.293-296
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    • 2001
  • This paper presents the results of field application test on the manufacturing of high fluidity concrete by applying flowing methods with segregation reducing type superplasticizer. Base concrete is made with 20% of fly ash, which is flowed during the transportation. According to test results, fluidity, placeability and segregation reducing performance meet the range of high fluidity concrete after flowing, while air loss occurs due to fly ash. There are no noticeable differences in compressive strengths between non-compacting and compacting methods. According to non-destructive tests with rebound and core strength test, we cannot detect any differences in strength according to the height in the structures.

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The Properties of High Flowing Concrete with Fly Ash for CFT Structure (플라이 애쉬를 사용한 CFT 구조용 고유동콘크리트의 강도특성)

  • Ahn, Nam-Shik;Lim, Hong-Chul;Choi, Jae-Gon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.93-96
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    • 2006
  • To investigate the properties of high flowing concrete with fly ash and crushed sand for CFT structure, many batches were performed by a trial-error method and the results were analyzed by SPSS software program. In the experiment W/B was set up as 0.25 and the variables were a substitution ratio of fly ash, a blend ratio of crushed sand and the ages of specimens (3, 7, 28 days). The results of this study are summarized as the follows; 1) The increase of the substitution ratio of fly ash, the decrease of dosage of SP and the increase of dosage of AEA due to very fine sphere particle of fly ash. 2) The increase of the blend ratio of crushed sand, the increase of dosage of S/a and water content related with viscosity. 3) Made the high flowing concrete, the increase S/a and the increase the water content.

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The Investigation of Application of Reject Ash and Recycled Fine Aggregate to High Flowing CLSM (고유동 CLSM를 위한 Reject Ash 및 순환 잔골재의 활용성 검토)

  • Song, Yong-Won;Yoon, Seob;Kim, Jung-Bin;Jeong, Yong;Park, Chan-Kyu;Lee, Seung-Hoon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.403-404
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    • 2009
  • This study has investigated application of the industrial by-product of reject ash and recycled fine aggregate to consider the economical issue to high flowing CLSM(controled low-strength material). But this high flowing CLSM is required more binder, so it has been estimated the influence of reject ash content, use of recycled fine aggregate and crushed sand, and air content about properties of CLSM.

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An Experimental Study on the Influence of Bonding Material Content Affecting on the Engineering Properties of High Strength Flowing Concrete (Part II) properties of hardened concrete (고강도유동화 콘크리트의 공학적특성에 미치는 단위결합재량의 영향에 관한 실험적 연구 (제 2보 경화콘크리트의 공학적 특성))

  • 김진만;이상수;최진성;박정일;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.35-38
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    • 1993
  • Although bonding material content of the high strength flowing concrete is very important in engineering properties, in rich mix concrete increasing the bonding material content may not follow more good properties. This study is to investigate the influence of the bonding material content affecting on the engineering properties of high strength flowing concrete, and this paper is to analyze the properties of hardened concrete. The results reveal that the strength of concrete having loss bonding material content is higher than that of concrete having more bonding material content, and that in proportion to increasing of concrete strength brittleness factors decrease, and that the static modulus of elasticity in this study is less than that in specification.

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High Flowing of Normal Strength Concrete using Viscosity Agent (증점제를 사용한 보통강도 콘크리트의 고유동화)

  • Kim, Jin-Cheol;Park, Sung-Hak;Jeong, Yong
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.04a
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    • pp.112-116
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    • 1996
  • This experimental study was performed to produce high flowing nomal strength concrete using viscosity agent. Test variables were selected to the viscosity agent contents with 4 levels, the cement contents with 5 levels and the coarse aggregate contents with 3 levels, etc. As a result, the high flowing and filling properties of concrete were obtatined by proper amount of viscosity agent and superplasticizer in the normal strength concrete. For the concrete mix proportions, it was found that unit weight of cement was more than 364kg/㎥ and volume of coarse aggregate was less than $280\ell/\textrm{m}^3$ in this study.

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A Study on the Evaluation of Frost Damage of High-Flowing Concrete using Blast-Furnace Slag (고로슬래그미분말을 사용한 고유동콘크리트의 시공을 위한 내동해성의 평가)

  • 권영진
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2001.11a
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    • pp.157-162
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    • 2001
  • Recently, lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem. However, most studies have been concentrated on the manufacture method and properties of fresh concrete, but there is few studies for the durability of hardened concrete, specially for the freezing and thawing. Therefore this study is to investigate for the resistance of high-flowing concrete using finely ground granulated furnace blast slag to frost with experimental parameters, such as binder, ratio of replacement of granulated furnace blast slag, superplasticizer, curing method and blain surface area of granulated furnace blast slag.

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