Cit:Kiriyama.etal:2017

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Author Kiriyama, Kyoko; Wakiya, Soichiro; Takatori, Nobumitsu; Ogura, Daisuke; Abuku, Masaru; Kohdzuma, Yohsei
Year 2017
Title Environmental control for mitigating salt deterioration by sodium sulfate on Motomachi Stone Buddha in Oita prefecture, Japan
Bibtex @inproceedings {Kiriyama.etal:2017,

title = {Environmental control for mitigating salt deterioration by sodium sulfate on Motomachi Stone Buddha in Oita prefecture, Japan}, booktitle = {Proceedings of SWBSS 2017. Fourth International Conference on Salt Weathering of Buildings and Stone Sculptures, University of Applied Sciences Potsdam, Germany, 20-22 September 2017}, year = {2017}, editor = {Laue, Steffen}, pages = {118-124}, month = {september}, organization = {Fachhochschule Potsdam}, publisher = {Verlag der Fachhochschule Potsdam}, note = {fulltext, conference paper}, key = {SWBSS2017}, doi = {10.5165/hawk-hhg/328}, author = {Kiriyama, Kyoko; Wakiya, Soichiro; Takatori, Nobumitsu; Ogura, Daisuke; Abuku, Masaru; Kohdzuma, Yohsei} }

DOI 10.5165/hawk-hhg/328
Link File:SWBSS 2017 Proceedings 118-124 Kiriyama Wakiya Takatori Ogura Abuku Kohdzuma.pdf
Notes in: Proceedings of SWBSS 2017 - Fourth International Conference on Salt Weathering of Buildings and Stone Sculptures. University of Applied Sciences, Potsdam, Germany, 20-22 September 2017



Bibliography

[Kiriyama.etal:2017]Kiriyama, Kyoko; Wakiya, Soichiro; Takatori, Nobumitsu; Ogura, Daisuke; Abuku, Masaru; Kohdzuma, Yohsei (2017): Environmental control for mitigating salt deterioration by sodium sulfate on Motomachi Stone Buddha in Oita prefecture, Japan. In: Laue, Steffen (eds.): Proceedings of SWBSS 2017. Fourth International Conference on Salt Weathering of Buildings and Stone Sculptures, University of Applied Sciences Potsdam, Germany, 20-22 September 2017,Verlag der Fachhochschule Potsdam 118-124, 10.5165/hawk-hhg/328Link to Google ScholarFulltext link

Abstract

This study aimed to develop an appropriate interior environment to mitigate the deterioration by sodium sulfate crystallization on Motomachi Stone Buddha in Oita prefecture of Japan. This Stone Buddha is carved on the fragile welded tuff and has been covered by a shelter for the preservation. On this site, salt crystallization, especially in winter, is a major deterioration factor of this Buddha. In previous studies, the crystallization of sodium sulfate and calcium sulfate were identified by XRD. The temperature and relative humidity were measured both indoor and outdoor. Water quantity analysis of the groundwater near the Stone Buddha has been conducted revealing a higher solute content near the Buddha than in the general groundwater in Japan. According to the temperature and humidity measured inside the shelter in winter, it was suggested that the solubility of sodium sulfate decreased greatly with dropping in interior temperature and phase change from mirabilite to thenardite (sodium sulfate anhydrate) caused the deterioration of the statue. Hence, the shelter was improved to reduce ventilation frequency and block the direct solar radiation in order to reduce evaporation and decreasing interior temperature in winter. In this study, we have conducted environmental research and salt crystallization experiments under controlled temperature and relative humidity to assess the improvements of the shelter. After improvements of the shelter, the indoor temperature and relative humidity increased in winter. According to our experimental results, the deterioration of the Stone Buddha is reduced highlighting the efficiency of the improvements.