Clay soils are widely used materials in various fields of science and industry in natural and modified form. The promising direction clay soils using in road construction is the use organosilicon compounds additives, which makes it possible to obtain hydrophobic and frost-resistant materials, as well as electrolytes, which gives high strength characteristics to clay soils strengthened by cement. To determine the interaction of soil and its components with complex additive based on octyltriethoxysilane OTES and sodium hydroxide SH, we tested the basic physical properties, strength and deformation characteristics of studied soil with complex additive, as well as the physicomechanical properties of kaolinite, montmorillonite, sand and silty-clay soil particles strengthened by Portland cement with the addition of OTES and SH. The use of OTES and SH additives led to increase the strength and frost resistance of kaolinite, montmorillonite, sand and silty-clay particles strengthened by cement.

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