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Report No.

Characterisation of colloidal silica grout under saline groundwater; Overall results for 3-year research project

Tsuji, Masakuni*; Aoyagi, Kazuhei ; Nakashima, Hitoshi*; Okihara, Mistunobu*; Sato, Toshinori

This paper shows an overall result of the 3-year study on the characterisation of the colloidal silica grout (CSG) under saline groundwater, aiming to enhance the existing rock grouting technology, especially for the CSG under the saline groundwater. As a first step, we performed the survey of the latest grouting technology of CSG. We developed a feasible mixing methodology and have obtained the various CSG's properties impacted by the salty mixing water or submerged by saline water. Moreover, we proposed a theory for the grout penetration under saline water and performed the injection tests. In the second workshop in the final year, our overall findings in this study were recognised to attain some progress in the development of the grouting technology.



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