Contents preface (VII) introduction 1—37

Fig. 15.16 Grouting of alluvial deposits

508 IRRIGATION AND WATER RESOURCES ENGINEERING
Grout mix is thus forced out of the rubber sleeve which expands slightly. The mix cracks the thin cylinder of clay-cement grout surrounding the pipe. The grout mix then enters the soil through these cracks. The grout mix is usually made up of clay, cement, and water in varying proportions and a predetermined amount (usually 50% of soil volume or 175% of soil voids) of the mix is pumped at each elevation.
Grout curtains may reduce seepage by significant amounts but their effect on hydrostatic pressure is relatively poor (8).