The article shows the possibility of reducing the water demand of clinker binders based on gypsum-free cement with a multicomponent additive of technical lignosulfonate and an aqueous solution of sodium silicate. The possibility of obtaining composites based on modified gypsum-free cement with improved properties for building structures has been demonstrated.

Keywords: composite, gypsum-free cement, composition, technical lignosulfonate, concrete, Portland cement, sodium silicate, strength

The article considers the possibility of increasing the resistance in sulfate environments of concrete composites based on cement raw mixtures modified with a slag mineral component and a complex superplasticizer. The method of research and modeling of the nature of the impact of an aggressive environment on composites proves the prospects of the technology of chemicalization of cement concretes for the manufacture of durable building structures based on them.

Keywords: sulfate environment, cement concrete, corrosion resistance, chemicalization, composite, environmental impact modeling

The article discusses the possibility of increasing the physical and technical properties of the sands of the Usklyai field in the Republic of Mordovia from the technological modes of their enrichment. The prospect of their enrichment due to preliminary screening and washing with water is proved.

Keywords: building sand, cement concrete, mortar, particle size modulus

The article discusses the possibility of improving the physicotechnical properties of the sand of the Usklyaysky deposit of the Republic of Mordovia for the production of cement concrete and mortar. The prospects of their enrichment due to preliminary screening and washing with water are proved.

Keywords: Building sand, cement concrete, mortar, particle size modulus

The article discusses the possibility of increasing the rheological properties of cement raw mixes for concrete and mortar by modifying them with plasticizing additives with metal / carbon nanostructures, manufactured by SIC IEMZ Kupol JSC. The introduction of ultra-small amounts of nanostructures into a plasticizer based on polycarboxylate esters contributes to an additional 20–40% increase in the rheological ability of plasticized cement raw mixes.

Keywords: Metal / carbon nanostructures, carbon metal-containing nanostructures, cement binder, plasticizing additive, superplasticizer

The possibility of determining the physical and mechanical properties of materials on the basis of measuring the fractal dimension of its structure is considered in the article. It is shown that there is a definite dependence between the composition of the cement composite and the fractal dimension, and, consequently, similar dependencies can be obtained for various physicomechanical parameters.

Keywords: Fractal dimension, microstructure, mathematical experiment planning, variable factors, three-component system, polynomial equation, regression coefficients

Density distribution, equivalent hydraulic radius, similarity criterion, statistical probability, pore space, fine-dispersed filler, differential porosity.

Keywords: Density distribution, equivalent hydraulic radius, similarity criterion, statistical probability, pore space, fine-dispersed filler, differential porosity