M. Yu. Vilenskii’s scientific contributions

Issues of development of compositions of injectable materials on inorganic basis for underground and transport construction are considered in the paper. Inorganic binders for aqueous suspensions for strengthening of low-strength sandy and debris soils by injection into the fortified massif are proposed. The use of silica gel in combination with hydrated lime for injectable aqueous suspensions is justified. The influence of superplasticizer on the technological properties of suspensions is shown. The properties of micro-cement of different compositions are presented. Optimal ratios of components were determined. The following properties of aqueous suspensions have been studied: viscosity, sedimentation and penetrating power. The viscosity was up to 40 s, sedimentation up to 1.4%. Soil-concrete obtained by injecting the aqueous suspension based on composite binders has the compressive strength in the range of 3.3-6.2MPa.

The use of ground granulated blast furnace slag is one of significant reserves to enhance the cost and technical properties of cement composites. slag corresponding to the portland cement fineness is often used. ultra-fine slags from industrial by-products with high specific surface area can be used with grinding technology development. two types of ultra-fine ground granulated blast furnace slag were studied in portland cement-slag compositions. the results of reduction of total binder amount per 1 kg of plasticizing admixture were obtained and discussed. reduction of binder amount was explained by water-reducing effects of plasticizing admixture in portland cement-slag compositions depending on type, quantity and fineness of slag.