• Title/Summary/Keyword: combined high flowing concrete

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Properties of the Combined High Flowing Concrete by Mix Design Factors (병용계 고유동 콘크리트의 배합요인에 따른 특성)

  • Kwon Yeong Ho;Lee Hyun Ho;Lee Hwa Jin;Ha Jae Dam
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.407-410
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    • 2005
  • This research investigates experimentally an effect on the properties of the combined high flowing concrete by mix design factors. The purpose of this study is to determine the optimum mix proportion of the combined high flowing concrete having good flowability, viscosity, no-segregation and design strength(40.0MPa). For this purpose, trial mixings used belite cement+lime stone powder(LSP) are tested by mix design factors including water-cement ratio($47.9\~54.0\%$), fine aggregate volume ratio($41\~45\%$) and coarse aggregate volume ratio($41\~45\%$). As test results of this study, the optimum mix proportion for the combined high flowing concrete is as followings. Water-cement ratio $51.0\%$, fine aggregate volume ratio $43{\pm}1\%$ and coarse aggregate volume ratio $0.30{\pm}0.05m^3/m^3$ and replacement ratio of LSP $42.7\%$.

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A Study on the Mix Design and Quality Factors of the Combined High Flowing Concrete Using High Belite Cement

  • Kwon, Yeong-Ho
    • KCI Concrete Journal
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    • v.14 no.3
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    • pp.121-129
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    • 2002
  • This study investigates experimentally into the design factors and quality variations having an effect on the properties of the combined high flowing concrete to be poured in the slurry wall of Inchon LNG in-ground receiving terminal. Especially, high belite cement and lime stone powder as cementitious materials and viscosity agent in order to improve self-compaction and hydration heat are used in this study. Water-cement ratio(W/C), fine aggregate volume ratio(Sr) and coarse aggregate volume ratio(Gv) as design factors of the combined high flowing concrete are applied to determine the optimum mix design proportion. Also quality variations for sensitivity test are selected items as followings. (1)Surface moisture(5cases) and (2)Fineness modulus of fine aggregate(5cases), (3)Concrete temperature(3cases), (4)Specific surface(3cases) and particle size of lime stone powder. As experimental results, water-cement ratio, fine and coarse aggregate volume ratio are shown as the optimum range 51%, 43% and 53% separately considering site condition of slurry wall. Also quality factors by sensitivity test should be controlled in the following ranges. (1) Surface moisture :to.67% and (2)Fineness modulus 2.6$\pm$0.2 of fine aggregate, (3)Concrete temperature l0-20t, (4) Specific surface 6,000$\textrm{cm}^2$/g and particle size 9.7$\pm$1.0${\mu}{\textrm}{m}$ of lime stone powder. Based on the results of this study, the optimum mix design proportion of the combined high flowing concrete are selected and poured successfully in the slurry wall of LNG in-ground tank.

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Flowing Characteristic of High Flowing Self-Compacting Concrete with mixing Steel Fiber (강섬유 혼입에 따른 고유동 자기충전 콘크리트의 유동특성)

  • Choi, Yun-Wang;Choi, Wook;Kim, Gi-Beom;Jeong, Jae-Gwon;Ahn, Tae-Ho;Eom, Joo-Han
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.461-464
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    • 2008
  • This study is compactability and Passing ability to get to know the flowing characteristic of high flowing self-compacting concrete with mixing steel fiber of various size and diameter. After flowing test, size and diameter are getting longer, flowing performance is getting lower. It meets the standard of combined high flowing self-compacting concrete of JSCE 2 grade and passing performance from ASTM C 1621. Through this study, it can be possible to be applied in site of HSCC with mixing steel fiber.

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The Study for the Air Bubble Deterioration of Combined High Flowing Self-Compacting Concrete (병용계 고유동 자기충전콘크리트의 기포저감을 위한 연구)

  • Choi, Yun-Wang;Kim, Kyung-Hwan;Ruy, Deug-Hyun;Jeong, Jae-Gwon;Kang, Hyun-Jin;Lee, Jae-Nam
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.449-452
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    • 2008
  • This study is to manufacture HSCC (High flowing Self-Compacting Concrete) be able to construction without vibration & hardening, and it is stable according to the change of the surface number of aggregate and to examine the factor of reduction occurred before after hardening through the indoor experiment. It is essential to use of the thickener to increase the viscosity in the combined HSCC. In this result, it make more bubbles than HSCC of pulverulent body. The result of study has shown, through the surface air bubble by not passed air bubbles within concrete after hardening, It has bad effect in not only appearance of structures but strength & duration. It is the experiment for air bubble of concrete according to the types of aggregate (fine aggregate), mixing time of concrete, exfoliation, material of model form and so that reduce the air bubble of combined HSCC. Experiments have shown, the effect of exfoliation was bigger than the effect of form for the performance of surface finishing of combined HSCC after hardening according to the exfoliation or material of model form and the opaque guris has good condition of finishing.

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Flowability Properties of Combined High Flowing Self-Compacting Concrete to the Addition of Viscosity Agent (증점제 첨가량 변화에 따른 병용계 고유동 자기충전 콘크리트의 유동특성)

  • Choi, Yun-Wang;Jeong, Jae-Gwon;Eom, Joo-Han;Choi, Wook;Kim, Kyung-Hwan;Moon, Dae-Joong
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.369-372
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    • 2008
  • In this research experimentally analyzes the flow characteristics of a combined High flowing Self-Compacting Concrete of which the viscosity agent and defoaming agent addition amount are changed, to make the combined High flowing Self-Compacting Concrete that can secure the required flow performance and air amount. As a result of the experiment, the slump flow of the combined High flowing Self-Compacting Concrete added with viscosity agent increases when the viscosity agent addition amount is 0.2%(${\times}$W %). When viscosity agent addition amount increases, viscosity agent shows that it largely deviates from the regulation value in the flow time of V-funnel, which is presented in the JSCE standards (grade 2). Also, all mixtures, except for mixtures added with viscosity agent, defoaming agent, and AE agent, do not meet a target air amount $4.5{\pm}1.5%$. High flowing Self-Compacting Concrete mixtureadded with defoaming agent shows that although time passes after its first mixture, its air amount reduces a little. Based on the experiment, we can know an optimal polymer amount to obtain the required flow performance

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An Experimental Study on Method of Packaged Dry Combined Materials for Concrete using Powder Admixture (분말혼화제를 사용한 콘크리트 포장(包裝)화에 관한 실험적 연구)

  • Han Da Hee;Nam jung Min;Park Hee Gon;Cho Sang Young;Lee Young Do;Jung Sang Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.624-627
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    • 2004
  • Most concrete is recently made of an aggregate which is properly absorbed, and carried in it according to its capability at every fields. We have been close to demand new capability of high flowing and enduring for specific concretes. That is difficult to cope with claiming the efficiency on deterioration from lack of a high Quality aggregate. Therefore, For solving the problems we apply to method of packaged dry combined materials for concrete using dried materials. That is to say that it is a kind of making into an instant. In this study, There is a purpose to present fundamental data, comparing and analyzing a phenomenon of aggregate's absorption following the rate of adding water, for using existing materials.

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A Fundamental Study on Method of Packaged Dry Combined Materials for Concrete - based on physical properties of concrete according to adding-water ratio - (건조된 콘크리트 재료의 포장화에 관한 기초적 연구 -가수율에 따른 콘크리트의 기초물성을 중심으로-)

  • 한다희;황병준;김제섭;박희곤;이영도;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.493-496
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    • 2003
  • Most concrete is recently made of an aggregate which is properly absorbed, and carried in it in order to do capability at every fields. We have been close to demand new capability of high flowing and enduring for specific concretes. That is difficult to cope with claiming the efficiency on deterioration from lack of a high quality aggregate. Therefore, for solving the problems we apply to a packing method for using dried materials. That is to say it is a kind of making into an instant. In this study, There is a purpose to present fundamental data, comparing and analyzing a phenomenon about aggregate absorption following the rate of adding water, for using existing materials.

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A Fundamental Study on Method of Packaged Dry Combined Materials for Concrete using Powder Admixture - based on tests for hardened concrete (분말혼화제를 사용한 콘크리트 포장화에 관한 기초적 연구 - 굳은 콘크리트 시험 중심으로 -)

  • Han Da Hee;Son young Jun;Jung Kwang Sic;Park Hee Gon;Lee Young Do;Jung Sang Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.153-156
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    • 2004
  • Most concrete is recently made of an aggregate which is properly absorbed. and carried in it in order to do capability at every fields. We have been close to demand new capability of high flowing and enduring for specific concretes. That is difficult to cope with claiming the efficiency on deterioration from lack of a high quality aggregate. Therefore. For solving the problems we apply to a packing method for using dried materials. That is to say it is a kind of making into an instant. In this study. There is a purpose to present fundamental data. comparing and analyzing a phenomenon about aggregate's absorption following the rate of adding water. for using existing materials.

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A Fundamental Study on Physical Properties of Concrete with Packaged Dry Combined Materials (혼합건식 포장 콘크리트의 물리적 특성에 관한 기초적 연구)

  • Kim Han Sik;Han Da Hee;Park Moo Young;Kim Woo Jae;Lee Young Do;Jung Sang Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.735-738
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    • 2005
  • Most concrete is recently made of an aggregate which is properly absorbed, and carried in it in order to do capability at every fields. We have been close to demand new capability of high flowing and enduring for specific concretes. That is difficult to cope with claiming the efficiency on deterioration from lack of a high quality aggregate. Therefore, For solving the problems we apply to a packing method for using dried materials. That is to say it is a kind of making into an instant. In this study, There is a purpose to present fundamental data, comparing and analyzing a phenomenon about aggregate's absorption following the rate of adding water, for using existing materials.

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A Study on the Estimation for the Guaranteed Strength and Construction Quality of the Combined High Flowing Concrete in Slurry Wall (지하연속벽용 병용계 고유동 콘크리트의 시공 품질 및 보증강도 평가에 관한 연구)

  • Kwon, Yeong-Ho
    • Journal of the Korea Concrete Institute
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    • v.18 no.6 s.96
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    • pp.811-817
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    • 2006
  • The primary purpose of this study is to estimate the guaranteed strength and construction quality of the combined high flowing concrete which is used in the slurry wall of underground LNG storage tank. The required compressive strength of this type of concrete become generally known as a non economical value because it is applied the high addition factor for variation coefficients and low reduction factor under water concrete. Therefore, after estimation of the construction quality and guaranteed strength in actual site work, this study is to propose a suitable equation to calculate the required compressive strength in order to improve its difference. Application results in actual site work are shown as followings. The optimum nix design proportion is selected that has water-cement ratio 51%, sand-aggregate ratio 48.8%, and replacement ratio 42.6% of lime stone powder by cement weight. Test results of slump flow as construction quality give average 616~634mm. 500mm flowing time and air content are satisfied with specifications in the rage of 6.3 seconds and 4.0% respectively. Results of strength test by standard curing mold show that average compressive strength is 49.9MPa, standard deviation and variation coefficients are low as 1.66MPa and 3.36%. Also test results by cored cylinder show that average compressive strength is 66.4MPa, standard deviation and variation coefficients are low as 3.64MPa and 5.48%. The guaranteed strength ratio between standard curing mold and cored cylinder show 1.23 and 1.32 in the flanks. It is shown that applied addition factor for variation coefficients and reduction factor under water concrete to calculate the required compressive strength is proved very conservative. Therefore, based on these results, it is proposed new equation having variation coefficients 7%, addition factor 1.13 and reduction factor 0.98 under water connote.