ABSTRACT This study investigates the thermal and mechanical properties of fiber-wrapped concrete specimens compared to a nominal mix without fibers, subjected to elevated temperatures of 250°C and 500°C over varying durations. Compressive and split tensile strengths were evaluated to assess the effectiveness of basalt, aramid, and hybrid (basalt + aramid) fiber configurations in enhancing concrete's resilience under thermal stress. Results indicate that fiber-wrapped samples consistently outperform the nominal mix in both compressive and split tensile strengths across all testing conditions. At 250°C, after 1 hour, compressive strengths ranged from 19.77 N/mm2 (nominal mix) to 21.08 N/mm2 (basalt + aramid strips), showcasing the protective role of fibers. Similarly, split tensile strengths at the same conditions varied from 2.03 N/mm2 (nominal mix) to 3.11 N/mm2 (basalt + aramid strips), highlighting significant improvements with fiber reinforcement. At 500°C, the nominal mix exhibited substantial strength degradation over time, whereas fiber-wrapped samples maintained higher strengths, particularly in hybrid configurations. These findings underscore the beneficial impact of fiber reinforcement in mitigating thermal-induced strength loss in concrete, suggesting practical applications in industries requiring fire-resistant structural materials. fiberwrapped wrapped fibers 250C C 250 500C 500 durations basalt concretes s stress hour 1977 19 77 19.7 Nmm2 Nmm N mm2 mm N/mm 2108 21 08 21.0 strips, strips , strips) Similarly 203 2 03 2.0 311 3 11 3.1 time thermalinduced induced fireresistant fire resistant materials 25 50 197 7 19. 210 0 21. 20 2. 31 3. 5

ABSTRACT In this study, the reinforcement of reinforced concrete (RC) components with a combination of aramid and basalt fibers to enhance the overall structural performance and durability. In this empirical investigation, we meticulously assess the strength of concrete components both with and without the incorporation of fibers, while also scrutinizing the strengthening of concrete components exposed to the detrimental effects of fire. The concrete components under scrutiny encompass cubes, prism cylinders, and other specimens constructed from standard concrete, as well as concrete components enveloped with basalt fiber and aramid fiber. This research endeavor adopts the M20 mix for the concrete specimens, which are meticulously cast and cured in order to facilitate the subsequent testing of compressive strength (CS), flexural strength (FS), and split tensile strength (STS). The potency and fire-resistant properties of the standard concrete specimens are juxtaposed with those of the concrete specimens enveloped with basalt fiber and aramid fiber, which are then subjected to varying temperatures. Ultimately, the culmination of this project consists of the presentation of the findings and the comprehensive elucidation of the details derived from the aforementioned experiments. study RC (RC durability investigation fire cubes cylinders M M2 CS, CS , (CS) FS, FS (FS) STS. STS . (STS) fireresistant resistant temperatures Ultimately experiments (CS (FS (STS