Method for improving the strength and impermeability of soils and engineering structures
US4988238A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1989 |
| Grant date | Jan 29, 1991 |
| Priority date | — |
| Expiry date | Oct 31, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K17/46
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed for improving the strength and impermeability of soils or engineering structures, which comprises the steps of: PA0 (a) applying to the site of the soil or of the engineering structure, an alkaline water glass solution comprising water glass in an amount of 15 to 40% by weight, calculated as dry substance; PA0 (b) allowing a time period to pass sufficient to permit the alkali present in the water glass solution to move by diffusion; PA0 (c) applying to the same site as in step (a), a silicic acid sol comprising SiO.sub.2 in an amount of 5 to 50% by weight calculated as dry substance, and an organic dispersion medium in which 10 to 100% by volume of the dispersion medium consists of a water-miscible organic solvent capable of reacting with the alkali content of the water glass solution applied during step (a), thereby gellifying the water glass so that the reaction product of the water-miscible organic solvent and the alkali content of the water glass is trapped within the gelled water glass; and PA0 (d) allowing a time period to pass sufficient to permit the respective organic dispersion medium present in the silicic acid sol to move by diffusion, so that gell…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.