Abstract
The development of perspective concrete mixes capable of resisting the action of external loads is an important scientific problem in the modern construction industry. This article presents a study of the influence of steel, basalt, and polypropylene fiber materials on concrete’s strength and deformation characteristics. A combination of various types of dispersed reinforcement is considered, and by methods of mathematical planning of the experiment, regression dependences of the strength and deformation characteristics on the combination of fibers and their volume fraction are obtained. It was shown that the increase in compressive strength was 35% in fiber-reinforced concretes made using a combination of steel and basalt fiber with a volume concentration of steel fiber of 2% and basalt fiber of 2%; tensile strength in bending increased by 79%, ultimate deformations during axial compression decreased by 52%, ultimate deformation under axial tension decreased by 39%, and elastic modulus increased by 33%. Similar results were obtained for other combinations of dispersed reinforcement. The studies carried out made it possible to determine the most effective combinations of fibers of various types of fibers with each other and their optimal volume concentration.
Highlights
At present, dispersion-reinforced concrete is undergoing significant development in the construction field
Determination of the strength and deformation characteristics of fiber-reinforced concrete was carried out using regression dependences, the type and values of the coefficients of which are determined by the methods of mathematical experimental design techniques
Improvement of the technology of heavy concrete is possible in the direction of combined dispersed reinforcement, that is, it is necessary to develop the already known methods of fiber reinforcement of heavy concrete in the direction of combined reinforcement, in order to significantly increase the structural characteristics of the resulting concretes
Summary
Dispersion-reinforced concrete is undergoing significant development in the construction field. This is related to the fact that, with all the benefits, concrete and reinforced concrete has several disadvantages. The brittle fracture of concrete is the most dangerous because it can lead to the sudden and progressive destruction of an entire building or structure. In [1], the advantages of using reinforcing fibers in latex-modified, fast-set cement concrete for emergency road structural layers repair were considered and studied in terms of strength, permeability and durability depending on the type of fiber. Uniform fibers were evaluated, including jute, PVA and nylon fibers, as well as hybrid blends of these PVA, and nylon fibers in a 1:1 weight ratio
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