Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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Initial Behavior and Shrinkage Properties of Lime Mortars for Restoration of Cultural Heritage According to the Mixing Ratio

석회 종류와 배합비 별 문화재 보수용 석회 모르타르의 초기거동특성과 수축특성 연구

  • Nam, Byeong Jik (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Noh, Sang Kyun (Construction Division, Korea Conformity Laboratories) ;
  • Kim, Eun Kyung (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Ahn, Sun Ah (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Kang, So Yeong (Restoration Technology Division, National Research Institute of Cultural Heritage)
  • 남병직 (국립문화재연구소 복원기술연구실) ;
  • 노상균 (한국건설생활환경시험연구원 건설본부) ;
  • 김은경 (국립문화재연구소 복원기술연구실) ;
  • 안선아 (국립문화재연구소 복원기술연구실) ;
  • 강소영 (국립문화재연구소 복원기술연구실)
  • Received : 2020.10.15
  • Accepted : 2020.11.12
  • Published : 2020.12.29
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Abstract

This study investigated the initial behavior (flowability and setting properties) and shrinkage characteristics of lime mortar, based on the mixing ratio of hydrated lime (lump, powder) and commercial lime, which is primarily used for repairing and restoring cultural assets. The flowability showed that the optimum mixing water contents of the masonry lime mortar were 8-10% for the lump hydrated lime, 10-18% for the powdered hydrated lime, and 17-40% for the commercial hydrated lime. The results of the setting and shrinkage analysis showed that the average final setting time ratio compared to the standard of cultural asset repair was in the increasing order of commercial hydrated lime(0.4) < powder hydrated lime(5.6) < lump hydrated lime(5.7). Moreover, the average shrinkage ratio was ordered as lump hydrated lime(1.1) < powder hydrated lime(1.2) < commercial hydrated lime(3.0). The analysis of the physical and chemical characteristics of hydrated lime showed that the optimum mixing water content was reduced as the particle size of the lime increased, thus delaying the setting time and decreasing the length change rate (shrinkage). These results are expected to contribute to the prediction of the initial behavior and shrinkage characteristics of mortars using handmade and commercial lime during repair and restoration work on cultural, heritage buildings.

본 연구는 문화재 보수에 사용되는 소괴 소석회, 분말 소석회, 시판 소석회를 대상으로 배합비에 따른 석회 모르타르의 유동성, 응결시간 및 수축율을 비교하였다. 유동성 시험 결과, 문화재 조적용 석회 모르타르의 최적 배합수 비율은 소괴 소석회 8~10%, 분말 소석회 10~18%, 시판 소석회 17~40%의 범위로 나타났다. 응결시간과 수축율 분석 결과, 문화재수리표준품셈에 기술된 전돌벽쌓기(습식) 대비 종결시간비는 시판 소석회(0.4) < 분말 소석회(5.6) < 소괴 소석회(5.7)의 순으로, 수축율비는 소괴 소석회(1.1) < 분말 소석회(1.2) < 시판 소석회(3.0)의 순으로 나타났다. 물리·화학적 특성 분석 결과, 소석회의 입자크기가 커질수록 최적 배합수 함량은 낮아졌고 응결시간은 지연되며 수축율은 감소하였다. 이와 같은 결과는 향후 건축문화재의 수리·복원 현장에 사용되는 석회 모르타르의 초기거동과 수축특성을 예측하는데 기여할 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 문화재청 국립문화재연구소 문화유산조사연구(R&D) 사업의 지원을 받아 이루어졌으며, 이에 깊이 감사드린다.

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