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Printed inn Grouting in the Ground Conference, London, 1992.

Strength Prediction of Chemically Grouted Sands

Ali Ameli, PhD, PEng, PE - Geo Engineering Ltd. BC, Canada

Silicate-aluminate grouts are low viscosity chemical grouts, which may be used in fine and medium grained sands. Although the strength of soils injected with these grouts will be relatively low, they have the considerable advantage that they are formulated from simple inorganic chemicals and are non-toxic and present a low hazard to the environment. The strength of chemically grouted soil is a function of both the intrinsic strength of the grout gel and the characteristics of soil and in particular the relative density of soil. In this paper methods for the measurement of intrinsic strength of the grout are discussed and also mix parameters, which influence it. A design chart is introduced to enable the mix designer to estimate the set time and the intrinsic strength of the gel for different mix proportion. The strength and stress-strain behaviour of sands injected with grout were also investigated and a procedure developed to relate the strength of grouted sand to the intrinsic strength of the grout gel determined with a shear vane. The procedure should be applicable to all types of chemical grouts and if this can be demonstrated it would enable a useful prediction of the strength of grouted soils from small-scale laboratory tests on the pure grout gel without the need for the preparation of grouted soil samples, which is always an elaborate and tedious process.

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