CHEMICAL LIQUID TO BE INJECTED IN SOIL

摘要

PROBLEM TO BE SOLVED: To easily design gel time, improve consolidation durability and prevent pollution of groundwater and corrosion of an underground structure by using an aqueous solution of active silicic acid and an aqueous solution of acidic silica sol as effective components. SOLUTION: An aqueous solution of active silicic acid which substantially does not contain any salt is obtained by removing alkali ions from a water-soluble silicate such as sodium silicate and the like by means of an ion exchange method or the like and pH thereof is preferably less than 4. An acidic reactive agent is preferably added to the aqueous solution of active silicic acid to adjust pH at a value not more than 2 whereby the aqueous solution keeps stability for a long term and production not in site but in plant is enabled. The acidic reactive agent is preferably phosphoric acid. The amount of water glass to be added to the aqueous solution of active silicic acid in preparing a chemical liquid to be injected to soil is 25-300 wt.% of the amount of total SiO2 existing in the aqueous solution of active silicic acid. Gel time can be arbitrarily and widely changed by changing a mixing ratio thereof.