Підготовка фібробетонних кубиків, які зазнали впливу високої температури, до експериментальних досліджень

Abstract

UA: У статті проаналізовано останні публікації щодо впливу фібрового армування на міцнісні і деформативні характеристики фібробетонів і зроблено висновок про недостатню вивченість впливу температури на механічні властивості матеріалу. Проведено планування експерименту, в якому визначено необхідну кількість зразків. Показано склад бетонної суміші, технологію виготовлення зразків, а також висвітлено і обґрунтовано підготовку зразків до випробувань.

EN: Fiber-reinforced concretes are varieties of composite materials. Such materials are commonly used nowadays. Concrete is fiber-reinforced using various fibrous materials, or fibers, which are evenly distributed over the volume of the concrete matrix and simultaneously provide its 3D reinforcement. Fiber-reinforced concrete has better stress-related strength characteristics than ordinary concrete. Since building structures must meet both the strength, rigidity and stability requirements, and the fire safety requirements, then for the extensive use of fiberreinforced concrete structures, not only the external load design, but also temperature effect design should be conducted in the design phase. The strength and strain characteristics of fiber concrete exposed to high temperatures must be known for this purpose. In view of this, three series of prisms were manufactured and tested: the first series contained no fiber at all (control prisms), the second series contained basalt fiber, and the third series contained steel fiber. Goal. To determine the effect of temperature on the strength and deformation characteristics of fiber concretes, as well as to identify the dependences of these characteristics on temperature, it is necessary to conduct experimental studies. For this purpose, the experiment was planned. Methodology. Experiment planning is a procedure for determining the number and conditions for conducting research that are necessary and sufficient to solve the problem with the required accuracy. The purpose of the study is to determine the cubic strength of fiber concrete depending on the heating temperature and the type of fiber. Results. The article analyzes publications on the influence of fiber reinforcement on the strength and deformation characteristics of fiber concrete and concludes that the influence of temperature on the mechanical properties of the material is insufficiently studied. Originality and practical value. The experiment was planned, in which the required number of samples was determined. The composition of the concrete mixture, the technology of manufacturing samples is shown, as well as the method of preparing samples for research is described and justified.