Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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Clarification the Current Situation of Deterioration and Its Causes of Modernization Heritage Built with Bricks in Japan: A Case Study of Long-Term Monitoring Investigation at Sarushima Battery, Yokosuka, Japan

  • Fukami, Risako (World Cultural Heritage Studies, Graduate School of Comprehensive Human Sciences, University of Tsukuba) ;
  • Matsui, Toshiya (Faculty of Art and Design, University of Tsukuba) ;
  • Kawamoto, Mayumi (Yokosuka City board of Education)
  • Received : 2022.07.16
  • Accepted : 2022.08.23
  • Published : 2022.08.20
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Abstract

A long-term monitoring investigation at Sarushima Battery (Kanagawa, Japan), which is one of the modernization heritages was conducted from 2017.06 to 2020.12. The investigation of the temperature and relative humidity (RH), measurement of the amount of brick decay, and X-ray diffraction analysis of the brick decay was conducted to understand in detail the environment in which the historical brick structure, the state of deterioration, identify the factors of deterioration. Furthermore, it was discussed whether the suitability of these investigation methods for assessing the status, identifying the level of deterioration and the factors that led to deterioration at the historical brick heritages. It was found that the brick deterioration at the site progressed especially in two periods: in April, and from June to August. These periods coincided with the period when the RH inside the structure decreased, and the Toyo-gumi bricks were in the process of absorbing moisture. Several different types of salts were detected in brick decay, especially thenardite, which is considered highly hazardous and destructive during periods when the amount of brick decay increased. Therefore, the RH in the structure and the salts present in the bricks were identified as one of the factors in the deterioration of the bricks at the site. The methods used in this study are appropriate as the initial survey methods for investigating the current conditions and identifying the causes of deterioration because it is possible to understand the environment within the modernization heritages, grasp the details of deterioration progression, and identify the characteristics of deterioration progression and its factors through long-term investigation using the simple methods.

Keywords

Acknowledgement

This study was made possible by the generous cooperation of the Yokosuka City Board of Education in conducting field investigations, sampling, and providing brick materials. The moisture adsorption/desorption test of brick samples was conducted in cooperation with Environmental System Research Laboratory, Division of Human Environmental Systems, Graduate School of Engineering, Hokkaido University. We would like to take this opportunity to thank all those who contributed to this study.

References

  1. Agency for Cultural Affairs, 2019, "The day for registered cultural properties," "The day for heritage of modernization," and the simultaneous opening to the public project. https://www.bunka.go.jp/english/policy/cultural_properties/awareness_raising/display/ (June 27, 2022)
  2. Flatt, R.J., 2002, Salt damage in porous materials: how high supersaturations are generated. Journal of Crystal Growth, 242, 435-454. https://doi.org/10.1016/S0022-0248(02)01429-X
  3. Fukami, R., 2019, Characterization of Japanese bricks made in the early years of Meiji in Sarushima. Master's Thesis, University of Tsukuba, Tsukuba, Japan. (Japanese)
  4. Joudai, Y., Noguchi, T. and Hayashi, A., 2020, Legislation for the preservation and utilization of industrial heritage in Europe. Musashino Hogaku Journal of Law and Political Science, 12, 165-202. (Japanese)
  5. Kuchitsu, N., 2005, Deterioration of brick as cultural property materials. Materiaru Raifu Gakkaishi, 17(1), 7-11. (Japanese)
  6. Oguchi, C., Matsukura, Y., and Kuchitsu, N., 2002, Environmental and seasonal influences on the spatial distribution of salt efflorescence and weathering on brick kiln walls. Chikei, 23(2), 335-348. (Japanese)
  7. Saitou, S., 2007, The brick ruins in Ichigayahonmuracho Site. In: Ogawa, N., Kobayashi, K., Morozumi, M. (eds.) The Story of Modern Japan which is Told by Archaeology. Douseisha: Tokyo. (Japanese)
  8. Tokyo National Research Institute for Cultural Properties, 2017, Preservation and restoration of brick buildings. Tokyo National Research Institute for Cultural Properties. (Japanese)
  9. Winkler, E.M. and Wilhelm, E.J., 1970, Salt burst by hydration pressures in architectural stone in urban atmosphere. Geological Society of America Bulletin, 81(2), 567–572.
  10. Yokosuka City, 2002, Yokosuka City cultural properties investigation report no. 9 Sarushima archaeological sites (Sarushima・Sarushima Cave, Sarushima Platform, Sarushima Battery). Yokosuka City: Kanagawa. (Japanese)
  11. Yokosuka City, 2014, Yokosuka City cultural properties investigation report no. 51 Tokyo Bay Fortress, Yokosuka City: Kanagawa. (Japanese)