Influence of injection rate on injectability properties of a cement grout in a sand

This work deals with an experimental study of the effect of the grouting flow rate on the injectability of sandy columns by a cement grout. The experiments consist in injecting a column of sand by a cement grout, from the bottom to the top, and record the variations of the column’s mass as well as the fluid pressures at various levels in the column. It was proved that the column of sand filters some cement particles from the grout. Besides, a clear effect of the grouting flow rate on the obtained results, was proved. Indeed, when the flow rate increases, the rate of cement filtration decreases. Furthermore, it was shown that the fluid pressure is an increasing function of the grouting flow rate. Key words: cement grout, sand, injectability, grouting flow rate, filtration.