The Center for Conservation Science and Restoration Techniques studied materials to restore the Otorii gate of Itsukushima Shrine. The study selected materials for use in a coastal setting with harsh conditions such as high temperature and high humidity, immersion in water, and the presence of salts. Forced degradation tests are currently being performed in the lab and an exposure test is being performed on-site. Exposure on-site began in June 2010, and the water content in test pieces is being measured and deterioration is also being observed, in every 2 months. These tests will continue in the future, and plans are to verify deterioration via a strength test in 2011. Forced degradation tests in the lab include a UV irradiation test and temperature cycle test, and plans are to conduct a salt spray test in 2011.
Exposed test pieces under an open platform (stage)