The article presents the results of studies of the strength properties of heat-protective fiber-gypsum-cement-vermiculite-concrete (FGCPVC) composites with volcanic ash with a maximum grain size of 0.16 mm, polydisperse reinforced with polypropylene RS produced by Russeal and basalt fibers of the RNB-9-1200-4s grade produced by PAO Ivosteklo. Expanded vermiculite of the 0.16–5 mm fraction from the St. Petersburg Mica Factory was used. It was found that the efficiency of the SDO additive at a dosage of up to 0.2% is from 2.3 to 3.1% of entrained air per 0.1% SDO, further increase in the dosage is impractical. Polypropylene fibers do not have a significant effect on the strength properties of FGCPVC composites. Reinforcement of FGCPBB composites with basalt fibers increases the compressive strength by up to 16%, bending strength by up to 73%, the Rf/R ratio with equal compressive strength increases to 51%. Polydisperse reinforcement of FGCPBB composites with basalt and polypropylene fibers increases the compressive strength by up to 40%, bending strength by more than two (2.26) times, the Rf/R ratio with equal compressive strength increases to 65%.
Keywords: gypsum, portland cement, ash, expanded vermiculite, polypropylene and basalt fibers, composites, compressive and flexural strength
The results of studies of the strength properties of polydisperse reinforced composites based on gypsum fiber cement binders are presented. The increase in compressive strength due to dispersed reinforcement reaches 16% at the age of 2 hours and 19% at the age of 28 days, with bending by 69% and 75%, respectively. The compressive strength level of at least 90% of the maximum strength value occurs with an l/d ratio in the range from 1100 to 1800. When bending, at least 90% of the maximum strength value occurs at any l/d ratio with a reinforcement coefficient of μ = 1.3%. When reinforced with basalt fiber in combination with polypropylene fiber, the compressive strength is 1.67 times. The increase in bending strength ranges from 2.17 times after 2 hours to 2.3 times after 28 days.
Keywords: gypsum cement binders, polydisperse reinforcement, composites, compressive and bending strength
The authors, having examined the main buildings, structures, and amenities located on Lenin Avenue in the capital of the Kabardino-Balkarian Republic, showed that, although there are almost no old buildings of the pre-revolutionary era in the Ciscaucasian city, it is rich in architectural objects in the pleasant, unpretentious Stalinist Empire style. Nalchik can be called a classic city in the mountains. The peculiarity of the city is a wide and spacious avenue with a high level of greenery, with a high level of improvement. This is the central and longest street in the city. The length is more than five kilometers. Lenin Avenue is an important landmark, which is essential for the city for the normal life of modern society. The center of the capital was formed around the avenue, where squares, residential buildings and public buildings, various establishments, recreation areas, as well as interesting architectural objects are concentrated. Prospect Lenina can be proudly entered into the register of cultural heritage objects as it meets the requirements for classic avenues.
Keywords: architecture, construction, master plan, rectangular grid of streets, wind rose, height above sea level, avenue, town-planning object, building, restoration, square, residential buildings, columns, towers, stucco capitals, Stalinist Empire style, baroque
One of the criteria for the effective operation of modern machines, machinery, tools and devices is a quiet drive. Research noise generation in mechanical gears is important. A modernization drive with a flexible link, as a method of solving the problem of noise reduction.
Keywords: noise, vibration, drive, machine, mechanism, chain drive, toothed belt drive, a study, a flexible connection
One of the criteria for the effective operation of modern machines, machinery, tools and devices is a quiet drive. Research noise generation in mechanical gears is important. A modernization drive with a flexible link, as a method of solving the problem of noise reduction.
Keywords: noise, vibration, drive, machine, mechanism, chain drive, toothed belt drive, a study, a flexible connection
Industrial machines provide a current transformer coil winding round the circuit. The need arose at the plant in the winding coils of square contour and to enhance the technological capabilities of your machine will offer a special tool. It is installed on the machine by plates on which the whole device is fixed. Coil is based on the internal circuits. Winding spool carried hook-owned machine, while the coil is moved relative to the hook-spool path corresponding to the four crank curve λ-shaped hinge mechanism Chebyshev.
Keywords: coil, transformer winding, machine, device, plate, hinge mechanism, the shuttle-spool, crank