Chemical Grouting of Subsidence Loess by Sodium Silicate Solutions with Low Weight Ratio

Abstract

Construction and exploitation of a buildings at loess foundations is the significant problem for southern regions of Russia and Kazakhstan. There are many methods for loess subsidence removal. The most common of them is preconstruction compaction by pinning. However, when the loess thickness is more than 4-6 meters or an exploiting building foundation improvement is required the chemical grouting by sodium silicate solutions is preferable way. Efficiency of such soil improvement will depend on the chemical composition and structure of loesses.From the author's viewpoint loesses are divided at three groups: the high active loesses, the moderate active ones and the inactive ones. This loess classification is caused by some geochemical criteria. The main ones are: absorption alkali capacity (AAC), gypsum content, water-soluble salts content, pH value and carbonate content (table 1).Grouting and Deep Mixing 2012 Downloaded from ascelibrary.org by New York University on 08/02/15.

Ground improvement using an expandable polyurethane resin

“…These methods are classified mainly according to the type of techniques used or according to the material used for the stabilization process. Cement, fly ash, lime, chemical stabilization, and other materials are used in the fields of soil stabilization effectively [1][2][3][4][5][6][7][8]. Jet grouting, mechanical stabilization, micro piles, geosynthetic, biotechnical and other techniques are widely used in the field of settlement compensation and soil reinforcement [9][10][11][12][13].…”

The Effect of Various Curing Temperatures on Engineering Properties of Chemically Grouted Sands

“…Figures 11{13 show that the relationship between the stress and the strain before failure becomes almost linear and the strains range from 0.13% to 1.5% at failure. This is a typical brittle behavior of sodium silicatereactant grouted sands [17,19,20,24,37]. As the temperature increases, the strains at failure increase, too.…”