SOIL STABILIZER EXCELLENT IN SOLUTION HARDENING STABILITY AT LOW TEMPERATURE

摘要

PROBLEM TO BE SOLVED: To obtain a soil stabilizer which has excellent working stability by incorporating a curing agent comprising phosphoric acid, glyoxal, a water-soluble Mg salt, and a ferric salt into a specified aq. sodium silicate soln. or a mixed aq. soln. contg. sodium silicate and colloidal silica. ;SOLUTION: An aq. soln. contg. sodium silicate having an SiO₂ to Na₂O molar ratio of (2.45:1) to (4.5:1) in an amt. of 10 to 50wt.% in terms of the total amt. of SiO₂ and Na₂O, or a mixed aq. soln. contg. sodium silicate having an SiO₂ to Na₂O molar ratio of not more than (4.5:1) and a colloidal silica having an SiO₂ to Na₂O molar ratio of (20:1) to (250:1), the SiO₂ to Na₂O molar ratio in the aq. soln. being (3:1) to (50:1), the total amt. of SiO₂ and Na₂O in the mixed aq. soln. being 10 to 50wt.%, is prepared as a main agent. A curing agent comprising phosphoric acid in an amt. capable of neutralizing 20 to 50mol% of Na₂O in the main agent, glyoxal in an amt. capable of neutralizing 5 to 30mol% of Na₂O in the main agent, and a water-soluble Mg salt, such as MgCl₂, and/or a water-soluble ferric salt such as FeCl₃ (0.1 to 7mol based on 200 liters of curing agent) is then mixed with the main agent in a main agent to curing agent ratio of (1:0.9) to (0.9 to 1) to obtain a soil stabilizer.;COPYRIGHT: (C)1998,JPO