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Comparative study on grouting of cement slurry and cement sodium silicate slurry

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Document pages: 10 pages

Abstract: Cement slurry and cement water glass slurry are the two most widely used slurry in soil grouting reinforcement engineering. During grouting, the viscosity change of cement slurry is negligible and considered to be independent of time, while the viscosity of cement sodium silicate slurry increases rapidly with time and is considered to be related to time. Due to the significant rheological differences between them, the increasing characteristics of grouting quality and grouting parameters may be different. These are the main factors in grouting design. In this paper, a large-scale three-dimensional grouting simulation device is developed to simulate the curtain grouting around a tunnel. Two groups of peripheral curtain grouting tests under different initial pressures   kPa, 150   kPa and 200   kPaere performed. The overload test on the tunnel was performed to evaluate the grouting quality of all surrounding curtain grouting experiments. The results show that the increasing trend of grouting pressure for cement-sodium silicate is similar to its viscosity; the setting time of cement-sodium silicate slurry obtained from the laboratory test is less than that in the practical grouting environment where grout slurry solidifies in soil; the grouting quality of cement-sodium silicate slurry is better than cement slurry, and the grouting quality decreases with initial pressure.

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