Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Early Age Strength of Concrete Using High Fineness Ordinary Portland Cement and Powdered Early Strength Admixture

고분말도 보통 포틀랜드시멘트와 분말형 조강 촉진제를 사용한 콘크리트의 조기강도 발현 특성

  • 이의배 (대우건설 기술연구원) ;
  • 고정원 (대우건설 기술연구원) ;
  • 유재강 (대우건설 기술연구원) ;
  • 김경태 (한라시멘트 기술지원팀) ;
  • 송동근 (아세아시멘트 연구개발팀) ;
  • 구경모 (아세아시멘트 연구개발팀)
  • Received : 2020.04.14
  • Accepted : 2020.07.17
  • Published : 2020.07.30
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Abstract

Recently, studies on concrete that can develop early age strength at low temperatures have been conducted for the purpose of shortening the construction period in cold weather. In other studies, high fineness ordinary Portland cement or type III high early strength Portland cement were used as a binder to develop early age strength. In addition, to further enhance the development of early age strength, a liquid chemical admixture was used. However, in this study, powdered early strength admixture was used instead of liquid early strength admixture to further stabilize the quality of concrete, and it is possible to keep the ratio of cement and admixture unchanged by premixing. In this paper, early age strength properties of concrete using premixed binder of high fineness ordinary portland cement and powdered early strength admixture were evaluated. Also, finally, the conditions that could satisfy the target strength of 5 MPa to remove gang form were analyzed. As a result, it was possible to get the target strength of 5 MPa within 18 hours if the curing temperature was 13 ℃ or higher, and it was possible to get the target strength of 5 MPa within 15 hours if the curing temperature was 15 ℃ or higher. The maturity value to reach the target strength of 5 MPa was calculated 363 ℃·hr. and 340 ℃·hr., respectively, for unit cement weight of 340 kg/㎥ and 370 kg/㎥.

Keywords

References

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