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4. 4) Onishi, T., Suzuki, M., Hayashida, N. and Komiya, K. (2013): Study of acid silica sol grout with colloidal silica, 48th Annual Meeting of JGS (in Japanese).
5. 5) Onishi, T., Suzuki, M., Hayashida, N. and Komiya, K. (2014): Study on the durability of grout material to the calcium carbonate-containing ground, 49th Annual Meeting of JGS (in Japanese).