Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Evaluation of Concrete Freeze and Thaw Resistance by Measuring Surface Rebound Value and Relative Dynamic Modulus of Elasticity

반발경도와 상대동탄성계수 측정에 의한 콘크리트 동결융해 성능평가 비교연구

  • 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 : 2021.09.17
  • Accepted : 2021.12.16
  • Published : 2021.12.30
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Abstract

This study investigated the possibility of early determination of frost damage on the concrete surface by using the rebound hardness method, widely used for estimation the compressive strength of concrete on the site. For this purpose, the surface damage of concrete was compared by measuring the rebound hardness and the relative dynamic modulus of the concrete for the multi-sided and single sided concrete surface exposed to freeze and thaw condition. Compared to the resonance vibration method, the rebound hardness method was able to show the frost damage 150 cycles quicker for the single-sided exposed concrete specimen and 50 cycles quicker for the multi-sided exposed concrete specimen. Therefore, it is considered that the rebound hardness method can determine the concrete surface damage more quickly than that of the resonance vibration method.

콘크리트의 압축강도 추정에 널리 사용하는 반발경도법을 이용하여 콘크리트 표면의 동해손상을 초기에 판정할 수 있는 가능성을 검토하고자 하였다. 이를 위하여 동결융해 열화조건에 다면으로 노출된 콘크리트와 단면으로 노출된 콘크리트에 대하여 반발경도와 상대동탄성계수를 측정하여 콘크리트 표면 손상도를 비교하였다. 반발경도에 의한 동해손상이 단면 노출 콘크리트 시험체에 대해서는 150싸이클 빠르게 계측되었으며, 다면 노출 시험체에 대해서는 50싸이클 빠르게 계측되었다. 따라서 반발경도법이 공명진동법보다 콘크리트 표면 손상을 신속하게 판정할 수 있는 것으로 사료된다

Keywords

Acknowledgement

본 연구는 한국건설기술연구원 주요사업(과제코드: 2021014001) 지원에 의해 수행되었습니다. 이에 감사드립니다.

References

  1. ASTM C805/C805M (2018). Standard Test Method for Rebound Number of Hardened Concrete, ASTM International.
  2. Korea Authority of Land & Infrastructure Safety (2018). Detailed Guidelines for Safety and Maintenance of Facilities(Performance Evaluation), Minister of Land, Infrastructure and Transport.
  3. KS F 2437 (2019). Standard Test Method for Dynamic Modulus of Elasticity, Dynamic Modulus of Rigidity and Dynamic Poisson's Ratio of Concrete Specimens by Forced Resonance Apparatus.
  4. KS F 2456 (2013). Standard Test Method for Resistance of Concrete of Rapid Freezing and Thawing, Korea Agency for Technology and Standards.
  5. KS F 2730 (2008). Testing Method for Rebound Number to Conclude Compressive Strength of Concrete.
  6. KS L 5201 (2021). Portland Cement.