By centrifuging it is possible to manufacture a wide range of building structures and products from reinforced concrete. Such products have several advantages, being relevant in modern construction, however, it requires careful compliance and quality control of the process. The frost resistance of concrete is one of the main indicators characterizing the durability of such building structures as reinforced concrete pillars of power transmission lines and contact network. The analysis of the literature and a series of experimental studies in the laboratory. The influence of the technology of manufacturing products from heavy concrete on the indicator of their cold resistance has been identified and determined.

Keywords: Racks of power transmission poles, racks of supports of the contact network, centrifugation, vibrating, frost resistance, heterogeneity of concrete, variotropy

The possibility of creating centrifuged products of an annular cross section with a variotropic structure due to the introduction of a porous aggregate is considered. Various methods of introducing coarse aggregate have been studied in order to increase the uniformity of the physicomechanical properties of centrifuged products. The study examines the effect of various types of fiber fibers on the physicomechanical properties of centrifuged concrete. The results of physical and mechanical tests of fiber-reinforced concrete showed that the greatest effect on compressive strength is achieved with the introduction of a metal fiber into the composition. At the same time, shrinkage deformations are lower by 20% in the composition with basalt fiber as compared with the control fiber. Studied recipe-technological techniques have proven their effectiveness and can be successfully applied in construction practice.

Keywords: centrifuged concrete, fiber, fiber concrete, coarse aggregate, porous aggregate, variotropic structure

The article presents and studies the theoretical foundations of vibration and centrifugal compaction of heavy concrete in the production technology of building products and structures. Attention is paid to such a technique as vibropressing. The physical entity is described, the phenomena of the processes occurring during the molding of such products and structures are disclosed. The influence of dispersed reinforcement of vibrated and centrifuged concretes by various types of fiber fibers on their coefficient of structural quality is considered and evaluated.

Keywords: vibrated concrete, centrifuged concrete, dispersed reinforcement, coefficient of structural quality, vibropressing

The article is devoted to the study of the problem of determining the mechanical properties of vibrating centrifuged concrete with a combined aggregate and fibrous additive, which was basalt fiber. Experimentally obtained data on the optimal consumption of disperse fiber. The dependence of the strength properties of concrete with a combined aggregate on the amount of fiber additive added is graphically presented. Also graphically shows the increase in the speed of the passage of an ultrasonic wave in the body of concrete when determining the prismatic strength. It was found that the presence of porous particles in a concrete mixture facilitates the directed distribution of mineral fibers along the section of the concrete ring. This, in turn, leads to an increase in the fracture toughness of the material. The conclusion is made that the joint introduction of porous and fibrous additives into the concrete mix determines the production (at the same cement costs) of high-strength concretes with an increased crack resistance, as evidenced by the data on the displacement of the boundaries of microcracks formation in the direction of their increase.

Keywords: structures and products of annular section, centrifuged concrete, vibrocentrifuging, mechanical properties of vibrating centrifuged concrete, combined aggregate, fiber additive, basalt fiber, prismatic strength