• 제목/요약/키워드: Low Heat Cement

검색결과 214건 처리시간 0.022초

저발연 시멘트를 사용한 초유동 콘크리트의 물성 (The Application of Super-flowing Concrete Using Low Heat Cement)

  • 노재호;한정호;송용순;최이현;천재원
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1997년도 봄 학술발표회 논문집
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    • pp.649-656
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    • 1997
  • The properties of super-flowing concrete with low heat cement were experimentally investigated and compared with ordinary 25-240-15 concrete with type Vcement. The cement content of super-flowing concrete with the low heat cement was 400 kg/$\textrm{m}^3$. However the hydration heat of super-flowing concrete is relatively lower than that ordinary concrete with type V cement. Also the ability to resist chloride ion penetration of super-flowing concrete with low heat cement is 5 times better than that of the ordinary concrete.

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저발열 콘크리트 수화열 평가의 실험적 연구 (Belite rich 시멘트 중심) (An Experimental Study on the Evaluation of Hydration Heat of Low Heat Concrete (in case of Belite rich Cement))

  • 현석훈;박춘근;신영인;김용호
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1996년도 가을 학술발표회 논문집
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    • pp.352-357
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    • 1996
  • In hardening massive concrete, the heat of hydation gives rise to considerable thermal gradientsand thermal stresses, which might cause early age cracking. This paper deals with the results of evaluation of hydration heat of low hear concrete, using Belite rich cement (low heat cement) and compared with OPC, slag added cement and fly ash addedcement. Result of evaluation of hydration are presented in this paper. The concrete made with Belite rich cement gets low temperature of center point and low thermal gradients between surface and center points.

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저발열형 시멘트 개발에 관한 연구 (Study on Low Heat Cements)

  • 최재웅;하재담;김동석;김기수;최롱
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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    • pp.46-51
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    • 1999
  • Mass concrete structures have many critical points in service. The cracks caused by the heat of hydration is the most serious problem, so that many method ot control cracks(precooling, postcooling, etc) have been applied to construction. But cooling methods take high cost and many installation and limits of field. Therefore it is useful to use the low heat hydration cements for low cost. This paper describes the characteristics of a low heat cement mixing the ternary components of cement(portland cement, blast furnace slag, fly ash) recently developed for mass concrete, belite cement, low heat slag cement(belite base) and fly ash cement (belite base). The objective of this paper is to study on low heat cement about initial compressive strength and hydration heat.

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저발열시멘트 콘크리트의 기초적 성질에 대한 연구 (A Study on the Properties of Low-Heat Cement Concrete)

  • 문한영;김성수;신화철;강석화
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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    • pp.57-60
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    • 1997
  • The properties of Low-heat cement are especially in lower heat of hydration than that of other types of cement. In other respect, Low-heat concrete is more advantageous than OPC concrete in chemical resistance, long term age compressive strength, slump loss and resistance to seawater. This paper deals with 28 days age compressive strength and slump loss by elapsed time of mortar and concrete that made with Low-heat cement and 3 types of other cement.

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포틀랜드계 시멘트 콘크리트의 촉진 염화물 확산 특성 (Accelerated Chloride Diffusion Properties of Portland Cement Concrete)

  • 김진철;이찬영;이용은
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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    • pp.775-778
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    • 1999
  • Accelerated chloride diffusion tests were carried out to estimate the chloride diffusion coefficient of concrete using ordinary portland cement, low heat belite-rich portland cement, and sulphate resistant portland cement. Concrete using low heat belite-rich portland cement showed a high diffusion coefficient due to delayed hydration of low heat belite rich portland cement, while the diffusion coefficients of concrete using sulphate resistant portland cement and ordinary portland cement were low.

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무기질 자극제를 사용한 탄소배출 저감형 저발열형 혼합시멘트의 수화특성에 관한 연구 (Hydration Properties of Low Carbon type Low Heat Blended Cement)

  • 최성우;류득현;김훈상;김규용
    • 한국건축시공학회지
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    • 제13권3호
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    • pp.218-226
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    • 2013
  • 건설재료 중 시멘트 및 철강은 대표적으로 탄산가스를 발생시키는 재료산업이다. 건설 산업에서의 탄소 배출량 감소를 위해서는 이러한 재료의 사용을 감소시키는 것이 가장 효과적이라고 할 수 있다. 본 연구에서는 시멘트의 사용량을 감소시킨 저발열형 혼합시멘트의 개발을 목적으로 하고 있다. 시멘트 혼합 비율을 10 %로 낮춘 저탄소 배출형 저발열 혼합시멘트의 수화 특성 및 콘크리트의 온도상승 특성을 검토하였다. 시험 결과, 혼화재의 반응 활성화를 위해서는 CaO 및 $SO_3$의 공급원 필요하며, 석고 및 생석회를 적정 배합비율 적용할 경우 초기에는 강도 발현이 다소 지연되지만 장기재령에서는 기존의 저발열 혼합시멘트와 유사한 성능을 확보 가능한 것으로 나타났다. 특히 저탄소 저발열 혼합시멘트의 경우 콘크리트의 수화열도 기존 저발열 혼합시멘트에 비해 감소시킬 수 있는 것으로 나타났다.

저발열시멘트 모르터의 호학저항성에 대한 실험적 연구 (An Experimental Study on the Resistance of Low-Heat Cement Mortar in Chemical Attack)

  • 문한영;신화철;김성수;강석화
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1998년도 봄 학술발표회 논문집(I)
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    • pp.183-186
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    • 1998
  • This paper deals with 28, 56, 91 days age compressive strength and ratio of weight when OPC and Low-Heat cement mortar immersed in chemical solution. As a result of experiment, the resistance of Low-Heat Cement motar in chemical attack is more effective than that of OPC, because of lower $C_3$A content and Pozzolanic reactions. Especially in long term age compressive strength, Low-Heat cement mortar shows higher strength in all kind of chemical solution compared with compressive strength of OPC motar.

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폐콘크리트 미분말을 이용하여 제조한 시멘트의 수화특성 (Hydration property of Recycled Cement Using Waste Cementitious Powder)

  • 신현욱;송훈;추용식;이종규
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2014년도 추계 학술논문 발표대회
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    • pp.47-48
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    • 2014
  • This study is to hydration property of low carbon type recycled cement from waste cementitious powder and cement raw materials. Waste cementitious powder possible to low carbon type recycled cement in small part of additive materials. Also, low carbon type recycled cement using waste cementitious powder is suitable for low heat type cement.

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비탄산염 원료 활용 저열시멘트 콘크리트 물성 평가를 위한 OPC와 저열시멘트의 물성 비교에 관한 연구 (A Study on the Comparison of Physical Properties of OPC and Low-Heat Cement for the Evaluation of Concrete Properties of Low-Heat Cement Using Non-Carbonate Raw Materials)

  • 권민수;허종완
    • 시멘트 심포지엄
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    • 통권49호
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    • pp.31-32
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    • 2022
  • 본 연구는 비탄산염 순환자원을 원료로 활용하여 석회석 사용량을 최소화할 수 있는 저열 시멘트 제조기술 개발을 위하여 일반 포틀랜드 시멘트(OPC)와 시중의 저열 포틀랜드 시멘트(LHC)의 물성을 비교하여 차이를 분석하기 위하여 모르타르를 배합비에 차이를 두고, 슬럼프, 강도, 내구성, 단열 특성 등의 물성평가를 실시하여 검토를 진행하고 있다.

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혼합형 초저발열 시멘트를 사용한 콘크리트의 물성-현수교 앵커리지 콘크리트 대상- (The Mechanical Properties of Concrete Using Blended Super Low Heat Cement)

  • 송용순;강석화;손명수
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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    • pp.341-344
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    • 1999
  • In the case of the offshore concrete structures like the anchorage block of a suspension bridge of Kwangan Grand Road, there is a need of the concrete which has low heat of hydration and good resistance for sea-water attack. In this study, the blended super low heat cement which satisfies that requirement was developed and several tests were carried out. The concrete using the blended super low heat cement showed lower adiabatic temperature rise than 3$0^{\circ}C$ and good early strength. Also, its passed charge(coulomb) to resist chloride ion penetration was very low.

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