• Title/Summary/Keyword: Cold Weather Concrete

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The Mechanical Characteristics and Hydration Heat on the Cold Weather Concrete using High Early Strength Portland Cement (조강시멘트를 사용한 한중콘크리트의 수화발열 및 역학적 특성)

  • Lee Won Am;Um Tae Sun;Ryu Jae Sang;Lee Jong Ryul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.305-308
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    • 2004
  • Cold weather concrete is the concrete which is used during construction under low-temperature' environment, and this kind of concrete has to be taken care not to be frozen in early ages of setting-hardening, It is specified in the Concrete Standard Specification(2003) as 'the cold weather concrete must be used on the weather condition under the average daily outdoor temperature below $4^{\circ}C$.' In this research, the mechanical characteristics and hydration heat on the cold weather concrete using high early strength portland cement were studied. As a result, the excellent quality was obtained and high early strength portland cement is expected to be used widely as the cold weather concrete.

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Influence of Cold weather Ready Mixed Concrete Quality according to Needs of Customer (고객요구에 따른 한중레미콘 품질의 영향)

  • 조일호;양재성;김성욱
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.647-650
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    • 2001
  • The purpose of this study was the influence of cold weather ready mixed concrete quality according to needs of customer were investigated by measurements of slump, air content, temperature and compressive strength. As a results, cold weather ready mixed concrete using high standard admixtures, high early strength admixtures and cold weather concrete plant were similarly to slump, air content, temperature and compressive strength.

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Determination of Cold Weather Concrete Periods Using Meteorological Data of Republic of Korea (기상자료를 이용한 한중콘크리트 적용 기간 산정)

  • Chung, Ji-Man;Han, Jun-Hui;Baek, Seong-Jin;Park, Jae-Woong;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.57-58
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    • 2023
  • This study is to estimate cold weather concrete periods by analyzing data of Korea Meteorological Administration in terms of recently revised cold weather concrete regulation of Korea Concrete Institute.

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Periods of Cold Weather Concrete Determined by Korean and Japanese Codes with Climate Data Obtained from Korea (우리나라 한중콘크리트 적용 기간의 KCI와 AIJ 규정에 따른 비교)

  • Lee, Myung-Ho;Zhao, Yang;Park, Jun-Hee;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.326-328
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    • 2013
  • This study compares the periods of cold weather concrete determined by the codes regulated by KCI (Korean Concrete Institute) and AIJ (Architectural Institute of Japan). For the calculation of the periods of cold weather concrete, the climate data for last 5 years obtained from Korean weather forecast station is used. Calculated data indicated that the period of cold weather concrete by AIJ code is longer than that by KCI code. Although global warming causes the decrease of the period of winter season, the temperature differences are large in Korea. Therefore, it is required that the current KCI code should be accordingly upgraded to reflect the weather variation in Korea over time.

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The On-site Quality Characteristics of the Cold Weather Concrete using High Early Strength Portland Cement (조강포틀랜드시멘트를 사용한 한중콘크리트의 현장품질 특성)

  • Lee, Won-Am;Um, Tae-Sun;Ryu, Jae-Sang;Lee, Jong-Ryul;Kang, Ji-Hun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.224-227
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    • 2004
  • The cement can be influenced by the temperature. Especially, when it is cold weather, it causes some problems in such properties as mixing, placing and curing of concrete. According to the Concrete Standard Specification(2003), in case of the average daily outdoor temperature below $4^{\circ}C$, it recommends to use the cold weather concrete. In this research, the on-site quality characteristics of the cold weather concrete using high early strength portland cement(Type III cement) were studied. As a result, the cold weather concrete using high early strength portland cement can obtain its excellent properties and benefit the cost of construction.

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A Study on the Cold Weather Concrete using High Early Strength Concrete (조강시멘트를 이용한 한중콘크리트의 특성평가 연구)

  • 임채용;엄태선;유재상;이종열;이순기;이동호
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.261-264
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    • 2003
  • Cold weather can lead to many problems in mixing, placing, setting time, and curing of concrete that can have harmful effects on its properties and service life. Korean Concrete Institute (KCI) defines cold weather as a period when the average daily air temperature is less $4^{\circ}C$ and recommends to cast concrete with special care such as shielding, heating and so on. The use of high early strength cements may improve the rate of hardening characteristics of concrete in cold weather by making it possible to achieve faster setting time and evolving more hydration heat than ordinary Portland cement. Higher early strength can be achieved using Type III cement especially during the first 7 days. The strength increase property of Type III cement at low temperature was studied. As a conclusion the heat or heat insulation curing period can be reduced to 50~75%. So, it can be used for cold weather concreting to reduce construction cost and extend the construction season.

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A Fundamental Study on the Application of the Period in Cold Weather Concrete (한중 콘크리트의 적용기간 설정에 관한 기초적 연구)

  • 한민철;백승대;윤기원;한천구;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.04a
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    • pp.408-413
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    • 1996
  • The purpose of this study is to present the reference data about the period in cold weather concrete practice based on meteorological data of Korea meteorological administration in our country in comparison with previous study and specifications of foreign country as to cold weather concrete such as ACI, JASS-5 and JSCE. The results of this study indicate that the period of cold weather concrete by each specifications in most of the region except Cheju island and coastal region in Korea is lasted over 100 days and the period of cold weather concrete in hillsides and inland areas is longer than that of coastal regions in the same latitude.

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An Experimental Study on the Practical Use of Cold Weather Concrete (한중 콘크리트의 현장 실용화에 대한 연구)

  • 소현창;정병욱;정경화;정문영;문성규
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.861-865
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    • 2000
  • During the placement of concrete in cold weather, there are serious problems due to frozen concrete in the early stage. These adverse effects prevent the hardening of concrete. There are special mixing, handling, placement and crying to minimize problems. Heat crying and sheet curing have been used in crying steps in order to reduce problems. However, these curing methods are not efficient because it is hard to obtain the good quality and strength of concrete, and moreover, it needs additional works for curing. In this study, we evaluate the application of cold weather concrete by the dose antifreezing admixture in concrete mix design. Because it is easy to handle inconstruction site and improve the quality of concrete. As the result of this paper is to present a successful case for the practical use of cold weather concrete.

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Development of cold weather concrete by using do-icing agency (방동제를 이용한 한중 콘크리트 개발 연구)

  • 유성원;서정인
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.953-958
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    • 2001
  • The concrete which has placed under cold weather has some defects such as the decrease of initial strength by hydration delay, strength unrecover at unhardened concrete freezing and structural failure and crack by expansion pressure. So, in this study, we tried to develope the concrete which can be made under cold weather without defect by using of do-icing agency In concrete test, the used do-icing agency has the characteristics of de-icing and rapid hydration. By test results, Co{$NH_{2}$$]_{2}$is unsuitable for workability, and NaN$O_{2}$ is the most suitable agency for cold weather. And for curing, the cured concrete at $21^{\circ}C$ for 24 hours has the safe strength.

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A Study on Optimal Mix Design of Cold-Weather Concrete (한중콘크리트의 최적배합에 관한 연구)

  • 소현창;정병욱;정경화;문성규;손석제
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10a
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    • pp.313-318
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    • 1998
  • Generally, the concrete constructed during cold weather has the frozen damage which cause the fatal damage so that heat curing and sheet curing was performed to prevent the early freezing of concrete. However, partial refrigeration caused by thermal gradient has many troubles so that the construction hasn`t been done as possible. This paper presents the development of strenth properties and optimal mix design against frozen damage under the cold weather, 1$0^{\circ}C$ below the zero.

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