The article considers the results of comparison of the main types of fibers available on the market for dispersed reinforcement of ordinary heavy concrete of class B30-B35, with an assessment of their influence on its rheotechnological and strength properties, the general nature of the destruction of the material. Six types of fibers were used for the research: metal wire wave, glass, basalt, composite, polypropylene and chrysotile. It was found that basalt and composite fibers have the least negative effect on the workability of the concrete mix. A slight decrease in mobility, which does not require changing the molding method or adjusting the composition of the concrete mix, occurs with the introduction of metal and polypropylene fibers. A significant decrease in mobility occurs when using glass and chrysotile fibers, which is associated with both the high specific surface area of the fibers and the need for thorough dispersion, which is difficult to achieve in standard concrete mixers. An increase in the compressive strength of concrete was achieved by introducing metal and basalt fibers into the concrete mix. The greatest increase in axial tensile strength of 50-60% is provided by the introduction of metal and composite fibers. Metal, composite and polypropylene fibers most effectively prevent the formation of concrete debris after destruction. The negative results obtained in some cases indicate that the use of such dispersed reinforcing additives requires the selection of a rational area of application, adaptation of the formulation and process of preparation of the concrete mixture, and not the low quality of the reinforcing additive.
Elistratkin et al. (Mon,) studied this question.