1. 1)M. Asano, Journal of Historical studies in civil engineering, 24, pp.173-184(2005).
2. 2)K. Kimura, S. Sone, Y. Namikawa, M. Kuwabara and K. Kadoyu, TECHNICAL NOTE of National Institute for Land and Infrastructure Management, 412, p.10(2007).
3. 3)Y. Ishikawa, A Study on the Durability Enhancement of the Japan’s Expressway Existed Bridges Damaged by De-icing salts, (doctoral dissertation), Nagaoka University of Technology, p.13(2013).
4. 4)財務省 令和2年度塩需給実績〈https://www.mof.go.jp/policy/tab_salt/reference/salt_result/st_zisseki20210630.html〉[Accessed July 5, 2021].
5. 5)E. Iwasaki, T. Nagato, A. Yuasa and T. Nishi, Journal of Structural Engineering A, 58A, pp.655-667(2012).