# Ultimate Compressive Strains and Reserves of Bearing Capacity of Short RC Columns with Basalt Fiber
## 1 Introduction  
Modern trends in the construction industry are based on innovative technologies and development of new materials, including an increase in the bearing capacity of concrete structural elements. There is increasing interest in fiber-reinforced concrete (FRC) due to improvements in FCR mechanical properties (e.g., enhanced adhesion of concrete). [PERSON] et al. investigated the influence of different fibers on the strength and crack resistance of reinforced concrete beams [1]. Experimental studies were carried out by varying the types of steel reinforcement, the degree of prestressing of the reinforced zone, and fiber inclusion. Fiber-reinforced concrete had a significant impact on the theoretical strength and crack resistance of reinforced concrete elements, regardless of the presence or absence of prestressing of steel reinforcement. One of the most beneficial trends in construction is the use of natural materials and recycled aggregates. [PERSON] et al. [2] compared recycled aggregate concrete with natural aggregate. Results showed that the addition of fiber could improve the mechanical properties and durability of FRC due to better fracture toughness. In addition, compared to other fibers, steel fiber plays a better role in improving the mechanical properties of concrete, but basalt fiber has better sustainability. [PERSON] et al. investigated the bearing capacity of corroded reinforced concrete slabs reinforced with textile and basalt fiber reinforced polymers [3]. The bending and deflection properties of reinforced concrete slabs reinforced with fibers and textiles significantly increased by 27.81-61.85% under moderate corrosion conditions. In a severe corrosion state, the increase in bending strength of the reinforced slabs was insignificant, but the increase in flexibility ranged from 18% to 35% compared to the control slabs. [PERSON] et al. tested the effectiveness of the reinforcement of plastic fibers [4]. Plastic fibers (up to 0.15%) were added to the concrete mix to evaluate the improved bearing capacity. The test results showed that the plastic fibers added to the tensile zone showed higher flexural strength compared to homogeneous concrete without fiber. Manufacturing technologies of FRC structures are crucial to ensuring load-bearing capacity. Research by [PERSON]' et al. [5] revealed technological features, in regard to changes in strength and the elastic modulus of vibration-centrifuged FRC columns of the tubular section. The authors found that the outer layer of the structure, on which the peak centrifugal load acts, has the highest strength, and the inner layer has the lowest. The three-layer structure of a vibration-centrifuged FC was experimentally confirmed. [PERSON] et al. improved the technology of centrifuged-reinforced concrete structures [6; 7] used in the construction of building columns and overpasses. [PERSON] et al. increased the bearing capacity of concrete via centrifugation technology [8]. They found that the use of dispersed-reinforced fibers led to an increase in the ultimate strength of bending, a decrease in shrinkage, an increase in crack resistance, and resistance to cycle alternations of freezing and thawing, drying, and moistening. Dynamic forces are dangerous types of loading and have a significant effect on a structure's durability. [PERSON] et al. studied the response on dynamic loading and damage accumulation in underground FRC structures and tunnel linings [9]. The mechanical properties were estimated experimentally, and the fracture mechanisms of FRC, with different reinforcement parameters, was studied. Calculations show that 7 kg/m\({}^{3}\) of the fiber reduces the level of damage to the lining structure after a seismic impact. This can be explained by the fact that the fiber increases the total energy spent on concrete crushing in comparison to unreinforced concrete of the same compressive strength class. [PERSON] et al. studied the characteristics of concrete slabs reinforced with ultra-high-performance fiber at the impact [10].