| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for hardening ground using an infusion solution which contains a relatively low concentration of a wear glass solution, surprising an amount of an sulfate ion to bring into the ground, has stabilized pH, and has a stabilized gel time at least one day. SOLUTION: In the method for hardening ground, a mixture of the water glass solution and the hardening agent is infused a medicine into the ground, where sulfuric acid and aluminum sulfate are used for the hardening agent. The water glass solution is used at such an amount that SiO2 is contained at 0.3-1.1 mol in 1L of the medicine solution. The sulfuric acid is used at such an amount that it may be contained at 0.3-0.7 mol relative to 1 mol of Na2 O in the water glass solution. The aluminum sulfate is used at such an amount that it is contained at 0.1-0.7 mol to 1 mol of the sulfuric acid. |
