• 제목/요약/키워드: High Fluidity Concrete

검색결과 306건 처리시간 0.052초

석회석 미분말 및 플라이애쉬 치환율 변화에 따른 고유동 콘크리트의 특성에 관한 연구 (A Study on the Properties of High Fluidity Concrete Incorporating Lime Stone Powder and Fly Ash)

  • 조병영;윤길봉;황인성;한민철;윤기원;한천구
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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    • pp.287-292
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    • 2001
  • This paper investigates the properties of high fluidity concrete incorporating lime stone powder and fly ash. Lime stone powder(LSP) and fly ash(FA) contents are varied with. According to test results, as LSP and FA contents increase, fluidity, air content and placeability shows a declining tendency. For the temperature history, both LSP and FA have favorable effects on reducing hydration heat, moreover, LSP reduces hydration heat more than FA. LSP shows undesirable strength loss as its content increases. FA also decreases the strength at early age, but it enhances later age strength. Accordingly LSP is expected to improve the quality at fresh concrete and reduce hydration heat, while it causes strength loss.

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고유동 폴리머 시멘트 모르타르의 강도 특성 (Strength Properties of High-Fluidity Polymer-Modified Mortar)

  • 주명기;이윤수;정인수
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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    • pp.312-315
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    • 2004
  • The effects of polymer-cement ratio, antifoamer content and shrinkage-reducing agent content on the strength of high-fluidity polymer-modified mortars using redispersible polymer powder are examined. As a result, the flexural and tensile strengths of the high-fluidity polymer-modified mortars using redispersible polymer powder tend to increase with increasing polymer-cement ratio, and tend to decrease with increasing shrinkage-reducing agent content, regardless of the antifoamer content. However, the compressive strength of the high-fluidity polymer-modified mortars using redispersible polymer powder decrease with increasing polymer-cement ratio and shrinkage-reducing agent content.

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재유화형 분말수지를 혼입한 고유동 폴리머 시멘트 모르타르의 건조수축 (Drying Shrinkage of High-Fluidity Polymer-Modified Mortar Using Redispersible Polymer Powder)

  • 이윤수;주명기;정인수
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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    • pp.296-299
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    • 2004
  • The effects of polymer-cement ratio, antifoamer content and shrinkage-reducing agent content on the setting time and drying shrinkage of high-fluidity polymer-modified mortars using redispersible polymer powder are examined. As a result, the setting time of the high-fluidity polymer-modified mortars using redispersible polymer powder tend to delayed with increasing polymer-cement ratio, regardless of the antifoamer conten,. Irrespective of the antifoamer content, the drying shrinkage of the high-fluidity polymer-modified mortars using redispersible polymer powder tend to decrease with increasing polymer-cement ratio and shrinkage-reducing agent content.

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고유동 폴리머 시멘트 모르타르의 내구성 (Durability of High-Fluidity Polymer-Modified Mortar)

  • 윤도용;이윤수;주명기;정인수
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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    • pp.691-694
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    • 2004
  • The effects of polymer-cement ratio and antifoamer content on the setting time and durability of high-fluidity polymer-modified mortars using redispersible polymer powder are examined. As a result, the setting time of the polymer-modified mortars using redispersible polymer powder tend to delayed with increasing polymer-cement ratio, regardless of the antifoamer content. The water absorption and chloride ion penetration depth of the high-fluidity polymer-modified mortars using redispersible polymer powder decrease with increasing polymer-cement ratio and antifoamer content. The water absorption and chloride ion penetration improvement is attributed to the improved bond between cement hydrates and aggregates because of the incorporation of redispersible polymer powder.

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콘크리트 충전강관구조(CFT) 적용을 위한 일반강도 콘크리트 물성에 관한 실험적 연구 (A Study on Characteristics of Normal Strength Concrete adapted to Concrete Filled Steel Tube)

  • 강동현;강용학;정근호;김우재;정상진
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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    • pp.1071-1076
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    • 2001
  • As a rule, in case of CFT for high-rise building, high strength concrete is required since it should have high fluidity, segregation resistance and large proportion of cement per unit considering the filling beneath the diaphragm. However, regarding the low-rise building under 20 stories, it is somewhat difficult to use high strength concrete. This is a fundamental study to develop a concrete with normal strength and high fluidity for CFT of low-rise building, whose Purposes are in speculating several kinds of changes in concrete's characteristics through various experiments and offering basic documents for practicalization in site and production through mock-up test.

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고강도 고유동 콘크리트를 이용한 콘크리트충전강관(CFT)구조의 충전성에 관한 공법 연구 (A study of the Method on the Packing ability of Concrete Filled in Steel Tube Structure by High Strength and High Flowable Concrete)

  • 강용학;정근호;임남기;이영도;정재영;정상진
    • 한국건축시공학회지
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    • 제2권1호
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    • pp.163-169
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    • 2002
  • In this study, there are kind of property experiments like fluidity, compressive strength, bleeding measurement, concrete sink for CFT use high fluidity concrete. The property difference between before transmit and after transmit concrete in the mock up test with ready mixed concrete equipment is examined. The variable factors in mock up are diaphragm existence and nonexistence, diaphragm placing hole sizes. To investing the concrete Property under diaphragm, concrete packing ability, hydration heat, core specimen strength tests are performed.

혼화제 종류에 따른 시멘트 페이스트의 레올로지 특성에 관한 실험적 연구 (An Experimental Study on the Rheology Properties of Cement-Paste Due to Different of Superplasticizer)

  • 류희정;최영준;김재훈;강훈;김화중
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1998년도 봄 학술발표회 논문집(I)
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    • pp.51-56
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    • 1998
  • The purpose of this study is to investigate and analyze the fluidity and rheology property of superplasticizer which is necessary using for high flowing concrete fluidity establishment, by changing the substitutional ratio of 6 kinds, and examined the fluidity and rheology properties as time goes by. In the result of this study, the fluidity and rheology properties are differently found and on the effects of admixture for the fluidity, F type is superior and A type is lower than others. Besides, F type is the mose superior values in the time goings.

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기존 원전용 콘크리트와 다성분계 고유동 콘크리트의 장·단기거동 비교 실험 연구 (The Comparative Experimental Study of short and long-term Behavior of the Blended High-Fluidity Cement Concrete and Existing Nuclear Power Plant Structural Concrete)

  • 이평석;권기주;김수만
    • 한국구조물진단유지관리공학회 논문집
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    • 제8권4호
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    • pp.195-202
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    • 2004
  • 본 연구에서는 결합재인 시멘트 외에 플라이애쉬, 고로슬래그 및 석회석 미분말을 사용하고 고성능감수제 등의 혼화제를 사용하여 고유동 무다짐이면서도 수화열을 적게 발생하는 콘크리트의 최적배합을 도출하였다. 이와 같이 선정된 배합으로 제조한 콘크리트의 장 단기거동을 기존 원전 콘크리트의 거동과 비교 검토하는 실험을 실시하였다. 연구결과 석회석이 혼합된 다성분계 고유동 콘크리트가 기존 원전용 콘크리트 보다는 시공성과 내구성이 향상되었음을 확인할 수가 있었다.

고로슬래그 미분말을 함유한 고유동 모르터의 유동성상에 미치는 영향 요인에 관한 연구 (A Study on the Factors Affecting the High Fluid Mortar Containing Ground Granulated Blast-furnace Slag)

  • 김재훈;윤상천;지남용
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2002년도 학술.기술논문발표회
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    • pp.29-36
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    • 2002
  • High fluid concrete unlike OPC concrete is made with various material, and the phase of fresh concrete is considerably different. In order to understand fluidity phase and mix properties of high fluid concrete, concrete is required to access as suspension structure which consists of aggregate and paste. The focus of this paper is to analyze the test results and quantify the effect of mix proportions of molar and fineness modulus of ,and on the properties of fresh mortar. The effect of water-binder ratio, sand-binder ration, content; of ggbs (by mass of total cementitious materials), and various contents of water reducing agent on the yield stress and plastic viscosity of the mix is studied. Based on the experimental results, the following conclusion; can be drawn: (1) The mixing time needed (or high fluid mortar was approximately two times more than that of ordinary portland mortar. (2) The fluidity phase of mortar could be explained by yield stress of mix and the fluidity of mortar. (3) As the content of ggbs increased, yield stress of mortar was decreased and plastic viscosity of it was increased. (4) For the high fluid mortar, it was appeared that sand-binder ratio should be below 1.5.

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극서환경에서 3시간 유지성능을 갖는 초유지 고강도 콘크리트의 특성에 관한 실험적 연구 (Experimental Study on Properties of High Strength Concrete with three-hours-fluidity-retention Performance in Extremely Hot Weather Conditions)

  • 조홍범;기전도;김광기;석원균;박순전
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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    • pp.201-202
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    • 2019
  • The high performace water reducing agent with three-hours-fluidity-retention performance is developed for the purpose of entering into the global market belonging to extreme environment such as Southeast Asia and the Middle East. In this study, the fresh and mechanical properties of the high strength concrete with three-hours-fluidity-retention performance are evaluated by making mock-up members in Vietnam.

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