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Report No.

In-situ experiment using low-alkaline cement shotcrete, 1; Mix design of composition of the shotcrete for the underground gallery support

Noguchi, Akira; Nakayama, Masashi; Kishi, Hirokazu; Kitagawa, Yoshito*; Minamide, Masashi*

We are researching about the low alkaline cement applying to support of galleries for high-level radioactive waste repositories. In March, 2009, we performed a experiment of shotcrete with low alkaline cement whose proportion of the binder is 40% of ordinary portland cement, 20% of silicafume and the rest 40% of flyash. By selecting the proportion 30% water binder ratio and adding superplasticizer, the slump was 23 cm and compressive strength of the hardened concrete was 38.3 MPa. This proportion satisfied the standard of the support of the Horonobe Underground Research Laboratory whose compressive strength is more than 36 MPa and slump is around 21cm. The rebound ratio of the shotcrete was around 13%. This value is lower than that of ordinary portland cement. So, we can expect to get a better construction environment with this shotcerte. We decided to use this proportion in the in-situ experiment at the 140 m gallery in the Horonobe URL.



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