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STRUCTURAL FEATURES OF ALUMINUM SILICATE SOILS STABILIZED BY THE ORGANIC ADDITIVE
Abstract
Previous researches have shown the possibility of using organic-mineral additive based on glyoxal for injection strengthening of soils in roadbases and engineering communications. Saponite containing material was used as mineral component in the composition. Saponite containing material is a solid phase, extracted from the circulating water suspension of the kimberlite ore dressing. Modification of the sandy soil by the tailored organic-mineral additive content increases its specific cohesion up to 50 times. It was established that this effect is achieved by polymerization reaction of the organic component of the additive, while the mineral component possesses the sorption properties regulating the structure formation in the system by formatting the optimum degree of the reaction mixture saturation by a liquid phase. The aim of this research presented in this paper was to study microstructural features of clay (aluminum silicate) soils stabilized by the organic additive. As the model of aluminum silicate soil saponite containing material was used. The study of the test samples composition by X-ray diffractometry method allowed to establish the presence of the following minerals: saponite 63 %, quartz 10 % and dolomite 10 %. The content of other minerals (chlorite, hematite, calcite, apatite, etc.) is 17 %. Microstructural features of samples were investigated by scanning electron microscopy method. The obtained electronic photographs of the analyzed compositions showed the formation of a homogeneous periodic colloidal structure (PCS). It should be noted that when the organic additive is used for strengthening clay soils introduction of an additional sorbent isnпїЅt required. This is due to sorption properties of clays. In this case, the polymerization process proceeds at a constant rate uniformly throughout the volume of the analyzed soil sample. The formation of the PCS is connected with increasing dispersion interaction between the particles of the soil by synthesis of a sealing layer from the organic polymer.
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