The article presents the results of a study of the rheological properties of cement compositions with a polycarboxylate-based plasticizer and stone flour from carbonate rocks of the Saratov region.

Keywords: cement, rheological matrix, powder-activated concrete, superplasticizer, hyperplasticizer, finely dispersed additive, stone crushing waste, stone flour, water-cement ratio, water-reducing effect

The article considers the topicality of the development of cement foam concrete meeting modern requirements for energy saving and energy efficiency. The interrelation of physical and mechanical properties of cement foam concrete with the features of its structure formation at macro- and microlevel is considered. The main components for the manufacture of structural and heat-insulating cement foam concrete are described. The results of experiments on the determination of the dependence of the parameters of the structure of a foam concrete mixture, which form the physical and mechanical properties of finished products, are presented. A mechanism has been established for the active participation of particles of fibrous cellulose filler in the organization of the structure of a foam concrete mix and samples based on it. The optimal concentration of fibrous cellulose filler in the raw meal mix was confirmed.

Keywords: structural and heat-insulating foam concrete, modifying additives, technical carbon, fibrous filler

The morphology of the modified Portland cement hydration products was studied transmission electron microscopy. The combined effect of polyvinyl alcohol (PVA) and sucrose on the morphology of hydrosilicates nanoparticles has a synergistic character. he presence of PVA enhances the effect of sucrose. The effect of synergism must be considered in the preparation of multicomponent modifier compositions including PVA

Keywords: "modified cement stone, transmission electron microscopy, the morphology of nanoparticles of hydrosilicates, sucrose, PVA, synergistic effect. "