About the technology
Soil stabilization (strengthening) is a revolutionary new approach to laying firm, water- and frost-resistant bases for various construction projects, which allows reducing cost of works by using local building materials.
Both traditional materials (cement, various slags, fly ashes, and others) and innovative ones are used for soil stabilization.
One of the innovative materials is Polybond, the liquid chemical admixture of ionic type.
Polybond is a dark brown liquid based on sulfuric acid and surface-active material, which provide the stabilizer’s unique property of decreasing inorganic binders’ consumption at soil strengthening, its firmness, water and frost resistance.
Polybond’s effect is based on its ability for ion substitution of film water on the surface of clayey soil particles with the stabilizer’s molecules. As the result, the clayey soil particles become smaller. Besides, Polybond reacts with chemically bounded water in clay-forming minerals, thus forming chemically stable compounds. Therefore, the soil processed with the stabilizer becomes more condensed than without it. The stabilizer’s molecules, which attach to the surface of a clayey particle, possess water-repellent properties, and the soil particles lose their ability to attract film water to their surface. The stabilized soil becomes firmer and virtually waterproof, which makes it resistant to exposure of any climatic conditions and capable of bearing target load even after long precipitations.
Application of Polybond is especially efficient for processing clay-bearing soil. In the result of soil processing with Polybond all film water on the surface of clayey particles becomes free and easily evaporates from the soil. And the degree of soil expansion and swelling reduces significantly.
Polybond application experience has shown much sooner drying, condensing and a higher level of physical and mechanical properties of the high plasticity clayey soils, to which minimal quantity of inorganic binder (2-3%) is added.
Strengthening of clayey soils with Polybond increases the ultimate compression strength of specimens at 28 days by 1.5-2 times if compared with reference specimens; and the water resistance index increases up to 0.8. The elasticity modulus of a soil layer strengthened with Polybond reaches 600 MPa and more.
Laying base layers and anti-frost heavy courses of soils that are strengthened with Polybond virtually ceases access of moisture to the soil of an earth road bed through the upper layers of a road-mat. As the result, the humidity of the upper layer of an earth road bed is always less than the one of traditional stone base courses laid on draining sand mat.
Due to the good distributive capability of the strengthened soil layers, surfaces based on such road bed are more even than the ones based on stone or gravel road beds.