The state and prospects of production and application of reinforcement with a periodic profile

DOI: 10.37153/2618-9283-2024-3-46-69

Authors:  
Rubric:     Theoretical and experimental studies   
Key words: : stages of interaction, concrete, reinforcement, annular profile, double-row profile, six-row profile, four-row profile, multi-row profile, spacer, competitiveness, efficiency, seismic, emergency loading, exorbitant loads, pulling from concrete, adhesion, plastic deformation, hardening
Annotation:

Introduction. The article considers the influence of the design solution of the reinforcement of periodic profile on the strength and deformability of adhesion to concrete.

Aim. Description of design solutions for new types of multi-row profiles, the results of their research and prospects for mass application in construction.

Materials and methods. The effectiveness of reinforcement in reinforced concrete depends on the mechanical properties of the material of the rods, the adhesion and interaction of their surface with concrete at all stages of loading, characterized by the design of a periodic profile. The methodology and equipment of the Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev were used to conduct the research.

Results. According to the results of foreign and domestic studies, it has been established that it is impossible to completely eliminate the existing disadvantages of the "ring" and double-row "crescent" profiles, due to the peculiarities of their design solutions, and improvement is futile.

Due to the preservation of adhesion strength with concrete in the extreme stage of deformation (after reaching the yield point), as a result of low spacer, new types of reinforcement provide increased construction safety, especially under extreme external influences (seismic, explosions, impacts, etc.).

The four-row profile of reinforcement, when synchronizing rolling rolls, forms a two-way screw thread on the surface of the rods and can successfully compete with foreign GEWI-Stahl screw rods.

Conclusions. Replacing rods with a two-row European crescent profile with rods with a four-row profile of domestic design will reduce the consumption of reinforcement in reinforced concrete structures by 10–25 %, ensure increased construction safety and save lives, especially in earthquake-prone areas of development, increase the competitiveness of Russian rebar products in foreign construction markets, and ensure substitution of foreign screw rods.

With an annual production of 10 million tons of rebar, only a 10 % reduction in its consumption in reinforced concrete will have an effect, due to saving metal, energy resources for its production, transport and technological costs, production of additional products, at least 100 billion rubles.

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