Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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The Condition Evaluation of Mortar Parts of Stupa of State Preceptor Jigwang from Wonju Beopcheonsa Temple Site by Half Cell Potential Measurement - with Focus on the Mortar Parts the RoofStone -

반전위 측정을 통한 원주 법천사지 지광국사탑 모르타르 복원부위 상태평가 연구 - 옥개석 모르타르 복원부위를 중심으로 -

  • Lee, Tae Jong (Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Cho, Ha Jin (Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Park, Hee Jeong (Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Chae, Seung A (Conservation Science Center, National Research Institute of Cultural Heritage)
  • 이태종 (국립문화재연구소 문화재보존과학센터) ;
  • 조하진 (국립문화재연구소 문화재보존과학센터) ;
  • 박희정 (국립문화재연구소 문화재보존과학센터) ;
  • 채승아 (국립문화재연구소 문화재보존과학센터)
  • Received : 2018.10.10
  • Accepted : 2018.11.22
  • Published : 2018.12.20
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Abstract

Stupa of State Preceptor Jigwang at Beopcheonsa temple site, Wonju, was conserved and restored in 1957. It was necessary to assess the degree of damage to the used mortar and to provide objective data on the necessity of its removal. Therefore, the HCP(half-cell potential) measurement used in concrete fields was applied. Multi-regression analysis of HCP data, following the rapid corrosion test of the roofstone mortar used by the rebar, resulted in a high correlation of HCP values(0.86), depending on the amount of corrosion and cover depth used for the steel bar. As a result, high correlation values(0.86) for the coefficients of determination were derived. The showed that the measurement of the wet conditions -431 to -663 mV on the roofstone indicated a corrosion damage rate of 90% or more after removal and restoration.

원주 법천사지 지광국사탑의 1957년 수리 복원에 사용된 모르타르의 손상정도를 평가하고 제거 필요성에 대한 객관적인 데이터를 제공하기 위해 콘크리트 분야에서 사용되는 반전위측정방법을 적용하였다. 철근이 사용된 옥개석 모르타르와 실내 실험체의 촉진부식시험 후 반전위 측정값에 대한 다중회귀분석 결과, 부식량과 피복두께에 따른 HCP 값의 결정계수는 0.86이상의 높은 상관식이 도출되었다. ASTM C876기준에 따르면 옥개석의 습윤상태 측정값 - 431~-663 mV는 철근의 부식손상 확률이 90%이상이기 때문에 손상된 모르타르를 제거한 후 신석재를 사용한 복원이 필요한 것으로 판단된다.

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References

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