**4. Conclusions**

The BCS 17-25.4-KV1 generally has an interesting result. The negative part would be that it is porous and appears to soak up most of the water in the solution, so that the mix's workability is steadily decreasing. Additionally, in the bending tensile test, the impact of fiber varied significantly with the size of the aggregates in the concrete mix. The question raised here is whether the BCS distribution in the mixing process depends on when it is added to the mix, and furthermore, before applying to the blend, whether it would saturate the fibers in water, assist the process of even delivery and have less effect on the mix's water content. In all cases, the post-failure behavior is apparent. However, on the positive side of the BCS, it is important to see how the elongation persists in the 19 mm grain concrete with considerable force, whereas the 4 mm grain concrete is more brittle, fractures, and disintegrates directly after break. The peak load value of BCS in the 19 mm grain size combination is considerably higher than in any other sample type in this study.

The behavior of the RFT Reforcetech minibars after the first peak (failure point) is different from the BCS. The BCSs have a somewhat more definitive curve than the RFT fibers, and a quicker post failure force drop down. The RFT result shows that concrete containing RFT fibers has more strength than other fiber-mixed concrete, as shown in Figures 8 and 9. In RFT, the distribution is better than in BCS and the RFTs show similar results regardless of the mix's grain size. It can be concluded that RFT significantly increases the workability of concrete mixes.

**Figure 8.** Reforcetech fibers load curves.

**Figure 9.** Basalttex fibers load curves.

The conclusion of this study is that the scale, quantity and type of basalt fibers have an impact on the outcome of how the concrete acts under load. The study also demonstrates how varying aggregate sizes affect how the beams behave under load. The study also demonstrates how varying aggregate sizes affect how the beams behave under load. All types of fiber show promising results, and a further analysis on variable quantities and fiber sizes would be worthwhile.

**Author Contributions:** Conceptualization and methodology, all authors; software, B.L.O.; validation, B.L.O. and G.J.E.; formal analysis, B.L.O.; investigation, B.L.O. and G.J.E.; resources, B.L.O. and G.J.E.; data curation, B.L.O.; writing—original draft preparation, B.L.O. and G.J.E.; writing—review and editing, all authors.; visualization, B.L.O.; supervision, G.J.E. and E.R.T. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** All data are stored by authors.

**Acknowledgments:** The publication cost of this paper was covered with funds from the Polish National Agency for Academic Exchange (NAWA): "MATBUD'2023—Developing international scientific cooperation in the field of building materials engineering" BPI/WTP/2021/1/00002, MATBUD'2023.

**Conflicts of Interest:** The authors declare no conflict of interest.
