Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Quantitative Estimation of Joint Spacing for Concrete Slab to Prevent Cracking of Drying Shrinkage

건조수축에 따른 균열 방지를 위한 콘크리트 슬래브의 정량적 줄눈 간격 산정

  • 이수진 (건국대학교 사회환경시스템공학과) ;
  • 이회근 (삼성물산(주) 건설부문 기술연구센터 기반기술연구소) ;
  • 이승훈 (삼성물산(주) 건설부문 기술연구센터 기반기술연구소) ;
  • 원종필 (건국대학교 사회환경시스템공학과)
  • Received : 2010.12.02
  • Accepted : 2011.04.08
  • Published : 2011.06.30
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Abstract

The installation of joint is to prevent random cracking due to drying shrinkage stress of concrete slab. However contraction joint spacing is empirically implemented into slab constructions without detail calculation based on quantitative criteria. In this study, shrinkage strain of concrete due to concrete shrinkage stress was measured to suggest joint spacing based on the study results. The test environmental conditions were applied temperature of $15^{\circ}C$ and relative humidity of 60%. The design compressive strength used was 30 MPa and 40 MPa, which are currently used in concrete slab designs. The drying shrinkage test result was applied to drying shrinkage models (ACI 209R, CEB MC 90, B3, GL 2000 and Sakata). The results showed that the most appropriate model was ACI 209R model. Based on the research findings, quantitative contraction joint spacing locations were calculated.

콘크리트 슬래브의 수축으로 인해 발생하는 응력에 의한 무분별한 균열을 억제하기 위해 줄눈을 설치한다. 그러나 설치된 줄눈의 간격은 구체적인 산출 근거나 정량적인 기준 없이 경험적으로 나누어지고 있다. 따라서 이 연구에서는 콘크리트 슬래브의 수축 응력에 의한 변형량을 측정하고 이에 따른 정량적인 평가 기준을 제시하고자 한다. 노출된 환경 조건은 온도 $15^{\circ}C$, 상대습도 60%를 적용하였다. 건조수축 실험은 현재 슬래브 설계에 많이 사용되는 설계 강도 30 MPa 및 40 MPa 배합을 사용하였고 그 결과를 기존 건조수축 모델에 적용하였다. 그 결과 ACI 209R 모델에 가장 일치하는 것으로 나타났으며 이를 바탕으로 콘크리트 슬래브의 정량적인 줄눈 간격을 산정하였다.

Keywords

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