Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Evaluating the Freeze-Thaw Damage of Concrete with Respect to Water to Cement Ratio Using Surface Rebound Value

표면반발경도를 활용한 물-시멘트비별 콘크리트의 동결융해 손상 평가

  • Park, Ji-Sun (Department of Building Research, KICT) ;
  • Ahan, Ki-Hong (Department of Structural Engineering Research, KICT) ;
  • You, Young-Jun (Department of Structural Engineering Research, KICT) ;
  • Lee, Jong-Suk (Department of Structural Engineering Research, KICT)
  • 박지선 (한국건설기술연구원 건축연구본부) ;
  • 안기홍 (한국건설기술연구원 구조연구본부) ;
  • 유영준 (한국건설기술연구원 구조연구본부) ;
  • 이종석 (한국건설기술연구원 구조연구본부)
  • Received : 2022.02.25
  • Accepted : 2022.04.28
  • Published : 2022.06.30
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Abstract

In this study the relative dynamic modulus and surface rebound hardness measurement methods were used for comparison to predict the occurrence of frost dam age on the concrete. From the test results, it was observed that the initiation of concrete dam age predicted by surface rebound hardness values was 200 cycles quicker than that of the relative dynamic modulus method in the W/C 70 specimens. In addition, it continuously provided data that showed the frost damage development of concrete surfaces according to increasing freeze-thaw cycles. This indicated that the frost dam age of the concrete could be found from the initial point of its occurrence by the surface rebound hardness measurement method. Similar results were also observed in W/C 60 and 50 specimens. Therefore, it is considered that surface rebound hardness method predicted the freeze-thaw damage well, regardless of water-cement ratio.

동결융해에 의한 콘크리트 손상 발생 시기를 평가하기 위하여 상대동탄성계수와 표면반발경도를 이용하여 비교하였다. 비교 결과 W/C 70 실험체군에서는 표면반발경도에 의한 콘크리트 손상 발생 평가가 200 싸이클 이상 빠르게 나타나는 것으로 관찰되었다. 뿐만 아니라 이후 점점 심해지는 동해를 표현할 수 있는 데이터를 지속적으로 제공해주어 동해 발생하는 초기 시점부터 동해를 확인할 수 있다는 것을 나타냈다. W/C 60과 50 실험체군에서도 표면반발경도가 콘크리트 동해 손상을 상대동탄성계수 보다 빠르게 평가했으며, 물-시멘트비에 변화에 상관없이 전반적으로 동결융해 손상시기 상대적으로 빠르고 정확하게 평가한 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원 주요사업(과제코드: 20220151-001) 지원에 의해 수행되었습니다. 이에 감사드립니다.

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