Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Experimental Study to Evaluate the Durability of 100 MPa Class Ultra-high Strength Centrifugal Molding Concrete

100MPa급 초고강도 원심성형 콘크리트의 내구성 평가를 위한 실험연구

  • 김정회 (아이에스동서(주) 기술연구소) ;
  • 김성진 ((주)주성이앤씨 기술연구소) ;
  • 이두성 ((주)주성이앤씨 기술연구소)
  • Received : 2023.11.27
  • Accepted : 2023.12.14
  • Published : 2024.02.28
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Abstract

In this study, a structural concrete square beam was developed using the centrifugal molding technique. In order to secure the bending stiffness of the cross section, the hollow rate of the cross section was set to 10% or less. Instead of using the current poor mixture of concrete and a concrete mixing ratio with a high slump (150-200) and a design strength of 100 MPa or more was developed and applied. In order to investigate the durability of centrifugally formed PSC square beams to be used as the superstructure of the avalanch tunnel or ramen bridge, the durability performance of ultra-high-strength centrifugally formed concrete with a compressive strength of 100 MPa was evaluated in terms of deterioration and chemical resistance properties.Concrete durability tests, including chloride penetration resistance, accelerated carbonation, sulfate erosion resistance, freeze-thaw resistance, and scaling resistance, were performed on centrifugally formed square beam test specimens produced in 2022 and 2023. Considering the information verified in this study, the durability of centrifugally molded concrete, which has increased watertightness in the later manufacturing stage, was found to be superior to that of general concrete.

본 연구에서는 원심성형 기법을 이용하여 구조용 콘크리트 각형보를 개발하였으며, 단면의 휨강성을 확보하기 위하여 단면의 중공률은 10 %이하로 하며 이를 위하여 기존의 빈배합상태의 콘크리트가 아닌 고슬럼프(150~200)의 물성을 갖으며 설계강도가 100 MPa이상인 콘크리트 배합비를 개발하여 적용하였다. 피암터널이나 라멘소교량의 상부구조로 활용될 원심성형 PSC 각형보의 내구성을 조사하기 위하여 압축⧵강도 100 MPa급 초고강도 원심성형 콘크리트의 열화 및 내화학적 특성에 대한 내구성능을 평가하였다. 2022년과 2023년에 제작한 원심 성형 각형보 시험체에 대하여 염화물침투 저항성, 촉진탄산화 , 황산염침식 저항성, 동결융해 저항성, 스케일링 저항성 등 콘크리트의 내구성 시험을 수행하였다. 본 연구에서 검증한 내용을 고려해 볼 때 추후 제작단계에서 수밀성이 높아지는 원심성형 콘크리트의 내구성은 일반적인 콘크리트에 비해 우수한 것으로 조사되었다.

Keywords

Acknowledgement

본 연구는 2021년 국토교통부(국토교통과학기술진흥원) 국토교통기술사업화지원사업 '원심성형으로 제작된 100MPa 급 초고강도 직사각형 보의 제작기술 및 이를 상부구조로 하는 피암터널 공법개발(RS-2021-KA161317)'를 통해 수행된 연구입니다. 연구지원에 감사합니다.

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