Selection of optimal parameters of basalt fiber for increasing the strength of fiber-reinforced concrete
DOI:
https://doi.org/10.36910/6775-2410-6208-2025-14(24)-06Keywords:
: fiber-reinforced concrete, basalt fiber, mix optimization, concrete strength, fiber reinforcement.Abstract
The article investigates the influence of the number and geometric parameters of basalt fibers on the strength characteristics of fiber-reinforced concrete and determines the patterns of changes in its main physical and mechanical properties. The aim of the work is to establish the optimal length of fibers and their volume content in the concrete matrix, which provide increased compressive, tensile and flexural strength. The relevance of the study is due to the need to increase the durability and crack resistance of concrete structures, especially under conditions of variable loads and aggressive environments, where traditional materials do not always provide the necessary reliability.
In the research process, Portland cement of the PC I-500 brand, quartz sand and granite rubble, as well as basalt fibers of various lengths (from 8 mm to 20 mm) in different ratios to the mass of cement were used. The research methodology involved the manufacture and testing of series of fiber-reinforced concrete samples in which the fiber parameters changed. The tests were carried out in accordance with current standards for determining compressive and flexural strength. For each composition, the average strength values, deviations and coefficient of variation were determined, which allowed us to assess the stability of the obtained results.
Experimental data show that the optimal use of basalt fibers with a length of 12 mm at a fiber content of 7.0% of the cement mass is optimal. It is with these parameters that an increase in tensile strength when bending is observed - up to 25% compared to control samples without fiber. When this content is exceeded, a deterioration in the homogeneity of the mixture and a decrease in strength due to fiber sticking are noted. The results obtained confirm the feasibility of using basalt fiber as an effective reinforcing component in the production of fiber-reinforced concrete structures of increased reliability and operational durability. The proposed recommendations can be used in the design of road surfaces, industrial floors, thin-walled panels and other structures subjected to dynamic loads.
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References
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