878,964. Stabilizing soil. SOLETANCHE. March 17, 1960 [June 19, 1959], No. 9469/60. Class 68(1). A clayey grout is injected into alluvial or like grounds, the grout being given a high mechanical strength by the addition of an acid phosphate and an alkaline silicate, in place of the usual cement. The undesirable flocculating action of the cement is thus avoided. The acid phosphate may be a monosodic phosphate or a mixture of alkaline phosphate with phosphoric acid. The weight of the phosphate and silicate is from 0À5 to 6% of the weight of the water in the grout prepared for injection.