CONCRETE COMPOSITES USING GRAND-SANDY MIXTURES OF DEPOSITS OF THE CHECHEN REPUBLIC

Objectives Development of optimal recipes of concrete mixtures using local natural raw materials in the form of gravel-sand mixtures from deposits of the Chechen Republic.Method The research methods adopted in the work are based on the theoretical principles and laws of designing and optimizing polydisperse multicomponent systems, the phase and structure formation of clinker minerals, the logic of mathematical calculations, the technological features of the structure formation of composite masses, the theoretical principles of controlling the rheological processes of mixes. All experimental data presented in the work were obtained according to the methods of current regulatory documents (GOST, recommendations, etc.).Result The paper presents the results of a study of the composition and properties of sand and gravel mixtures of deposits of the Chechen Republic and concretes based on them. In particular, the granulometric and chemical compositions and the physicomechanical properties of sand and gravel mixtures have been studied. An analysis of the scientific literature and experience in the use of sand and gravel in construction. The leading scientific schools of the country and abroad in the field of concrete science are presented. The rheological indices of concrete mixes were studied and the dynamics of the curing of concrete of different classes were obtained on the basis of unfortified sand and gravel mixtures in the presence of a chemical additive, the superplasticizer Polyplast SP-1.Conclusion It is proposed to use sand-gravel in its natural form in concrete for non-critical structures in its natural form without additional costs for enriching its composition. The feasibility of obtaining low-grade concrete with the use of sand and gravel mixtures without its enrichment and fractionation is established

OBTAINING CLINKERLESS CEMENTS THROUGH THE SYNTHESIS OF BASIC SOLUTIONS OF SODIUM SILICATE FROM SILICA-CONTAINING ROCKS

Objectives The creation of clinkerless cements that do not require high-temperature processing and significant natural resources, at the same time as exhibiting good technical parameters, seems to be an important research task. Cements of alkaline instillation, in which alkaline metals play an active role, are capable of interacting with minerals of aluminosilicate nature forming strong and insoluble compounds.Methods Concrete composites from binding substances activated by alkaline were developed on the basis of Russian and foreign experience of using cinder slag composites in construction.Results In this work, energy-dispersion microanalysis of the developed clinkerless compositions based on alkaline silicate sodium solutions from silica-containing rocks was carried out.Conclusion Formulations of clinkerless cements based on high-dispersal powders of different natures mixed by the alkaline solution obtained using the wet technique at temperatures of up to 95 °C and atmospheric pressure are proposed. This technology will expand the use of alkaline cements, thus leading to the development of concrete having desired properties