Abstract
This article contains information about strengthening the under-ground parts of buildings and restoration of their bearing capacity, along with solutions of urea-formaldehyde resin and solutions based on sodium silicate (which have a number of significant drawbacks, such as short-lived strengthening, low strength of reinforced soil (0.1-0.5 MPa), brittle destruction under dynamic loads, environmental pollution), using impregnation compositions based on fine mineral binders. This compositions, with the name «Mikrodur», are obtained on the basis of air separation of Portland cement CEM I 52.5 (PC D0 M600) and fine-divided blast furnace slag. The method of preparation of suspension on the basis of finely dispersed binder is considered. The main characteristics determining the finely dispersed binder suspension, such as viscosity and stability of the injectable suspension (sedimentation), are established. It is proved that the indexes of viscosity and stability of solutions depend on the method of their preparation, water/binding ratio and chemical admixtures. A variety of finely dispersed binders grades on mineral composition allows providing ground, stone and concrete structures of underground constructions stabilization taking into account various requirements: strength enhancement and anti-filtration properties of the strengthened masses, their resistance to various aggressive influences, the possibility of hardening in conditions of negative temperature, acceleration of a strength enhancement.
Highlights
In many industries, the filling of pores and capillaries of materials with special compositions to give them special properties is achieved by impregnation
Finely dispersed binder "Mikrodur" (FDB) with three grades: R-U, R-X, R-F were used as test materials for sealing and ground stabilization
A variety of grades of finely dispersed binder "Mikrodur" (FDB) on mineral composition allows providing soil stabilization, strengthening of underground structures taking into account various requirements: strength enhancement and anti-filtration properties of the strengthened masses, their resistance to various aggressive influences, the possibility of hardening in the conditions of negative temperature, acceleration of a strength enhancement
Summary
The filling of pores and capillaries of materials with special compositions to give them special properties is achieved by impregnation. There are several ways of impregnation of building products of inorganic origin, which have a system of connected closed and open capillaries. Physical and chemical interaction between the solid capillary-porous body and the impregnating agent is that the impregnant has an increased adhesion to the monoliths surface due to the partial chemical bond with the minerals of the capillary-porous construction product. P.A. Rehbinder and I.A. Ryb’ev [1, 2] in their works consider the processes and phenomena from the standpoint of physicochemical mechanics, for example, the sorption occurring in solids in the impregnation of their various fluids.
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