Grout material for ground injection and ground grouting method

摘要

PROBLEM TO BE SOLVED: To provide a grout material for grouting which ensures easy adjustment of gelling time, excels in infiltration property into the ground, and exhibits high durability and solidification strength, even when it has a composition not using phosphoric acid at all or using a reduced amount of the phosphoric acid, and to provide a grouting method using the grout material.;SOLUTION: The grout material for grouting is mainly composed of colloidal silica and sodium silicate, contains an inorganic acid and an organic acid as a gelling agent, and has a pH at 25°C of 2-7. It is preferable that the grout material for grouting contains a pH buffer solution prepared by combining an inorganic acid with an organic acid having the logarithmic value (pKa) of the reciprocal of an acid dissociation constant at 25°C in the range of 1.0-7.0, and has buffering action in the pH range of 2-7.;COPYRIGHT: (C)2012,JPO&INPIT