[M-IS09] Weathering and conservation of cultural heritage and geosites

[MIS09-02] Study on relations between deterioration of tuff stone used as exteriors of a historical building and microenvironment factors

*Uno Tomoko¹, Chiemi Iba², Masaru Abuku³ (1.Mukogawa Womens University, 2.Kyouto University, 3.Kinki University)

Keywords:Deterioration Condition, Microenvironment, Conservation of Historical Building

Two types of tuff stone (Nichika Seki, produced in Ishikawa prefecture, and Tatsuyama Ishi produced in Hyogo prefecture) are used as exterior in the former Koshien Hotel, which was built in 1930 and used as the campus building at Mukogawa Women’s University. According to the condition survey of the stone, we found that the deterioration types in the two stones are different. In addition, even if the stone is in a similar environment, one side is damaged, while the other side is not damaged.

To investigate these factors of the deterioration, we grasped the material properties of these stones; stone structure, pore size distribution of the stones, thermal and moisture conductivity. We also investigated the deterioration condition of the stone and the surrounding microenvironment.

As a result, it was expected that the area and degrees of the stone getting a wetting by rain, the surface temperature changes of the stone exposed by solar and nocturnal radiation were affecting the deterioration. Based on the results of the condition survey, thermal and moisture properties, and boundary conditions, we are planning to analysis the temperature and water content inside the stone.