• Title/Summary/Keyword: SUPER concrete

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The Bond Strength of Super Retarding Concrete According to Delay Time of Placement (타설지연시간 변화에 따른 초지연제 사용 콘크리트의 부착강도)

  • Han, Soo-Hwan;Sin, Se-Jun;Choi, Yoon-Ho;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.11a
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    • pp.75-76
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    • 2020

  • In this study, in order to check whether the adhesion strength can be secured when installing concrete by mixing super-retarding agents, the splitting tensile strength of the joints of each mold was measured and then analyzed. The results of the experiment showed that the bonding performance of the joint is adversely affected if the installation delay is delayed for more than 24 hours, and that the attachment performance can be secured if the installation is delayed within about 24 hours.

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Setting Characteristics of Cement Mortar with Super Retarding Agent Mixing Rate in High Temperature (고온조건에서의 초지연제 혼입율 변화에 따른 모르타르의 응결 특성)

  • Lim, Gun Su;Han, Soo Hwan;Jeong, Yeong Jin;Hyun, Seung Yong;Han, Min Cheol;Han, Cheon Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.131-132
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    • 2021

  • In this study, as part of the study to reduce and integrate heat of hydration of concrete, the performance change of super retarding agent is examined in the mortar area under high temperature conditions. It was confirmed that the setting time delay can be adjusted from several hours to several days depending on the high temperature and the change of super retarding agent mixing rate. With the increase of super retarding agents, the early age strength was delayed while at 28 days the use of super retarding agent results in an increase of strength remakably.

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Strength Development of Low Heat Portland Cement Concrete in High Strength Range (저열 포틀랜드 시멘트 콘크리트의 고강도 영역에서의 강도발현 특성)

  • Ha Jae Dam;Um Tai Sun;Lee Jong Ryul;Kwon Young Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.353-356
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    • 2005

  • Strength development of low heat portland cement(Type IV) concrete in high strength range is tested. In this study strength development according to water-binder ratio, strength development according to age, effect of fly ash and super plasticizer are tested. This study tests effect of low heat portland cement in high strength range concrete and provide guide line concrete mix design for later study and/or construction.

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