### Literature Review  
Many known studies in which the mechanical and microstructural efficiency of geopolymer pastes reinforced with different types of fibers and different percentages of sodium nanodioxide were considered. Based on the results of the tests carried out, the authors determined that using sodium nanodioxide in an amount of 3% was the most effective for improving the mechanical, microstructural properties, and fracture characteristics of geopolymers [7; 8; 9; 10]. The influence of mono (single type) and hybrid (mixed type) fibers on workability, strength properties, and viscosity parameters of a geopolymer solution based on fly ash was also studied. It was found that the workability of the mortar decreased more when using polypropylene fibers due to their higher dispersion in the geopolymer solution compared to bonded fibers from alkali-resistant glass and polyvinyl alcohol. On the other hand, the compressive strength increased by 14% using 1% steel fibers with 0.5% polypropylene fibers compared with a control mixture of 48 MPa. In geopolymer solutions based on fly ash with a high sand-to-binder ratio, it is possible to achieve hardening with extensive cracking and sagging by using steel fibers in mono- or hybrid forms with fibers from alkali-resistant glass and polyvinyl alcohol [8]. The effect of carbide slag, nickel-laterite waste, and various concentrations of NaOH on the physical and mechanical properties of geopolymer composites based on fly ash was studied in [11]. The research results showed that, in general, the inclusion of a carbide slag additive provides a higher rate of the chemical reaction and a higher rate of pore formation when exposed to a higher temperature and reduces the shrinkage of the composite upon drying. It was determined that the molarity of NaOH\({}_{12}\)M provides the optimal rate of the geopolymerization process. However, the low concentration of sodium hydroxide in the alkaline activator solution limited the dissolution of fly ash and incomplete filling of the interparticle volumes of the participating gels, and the excessive amount of Na + ions during geopolymerization at 14 M led to the process being incomplete, which reduced the strength of the aggregate [12; 13; 14]. Geopolymers based on metakaolin are also quite popular in modern research. The authors studied the effect of the K/Al ratio at elevated temperatures on the thermomechanical properties of metakaolinite-based geopolymers filled with chamotte. Therefore, it was found that with an increase in the K/Al ratio, the crystallization temperature of new phases (leucite and kalsilite) and the temperature of the onset of the primary shrinkage decreased [15; 16; 17; 18; 19; 20; 21]. The effect of glass waste on the mechanical characteristics and microstructure of geopolymers was also investigated. Therefore, the authors have developed geopolymer mixtures with different percentages and a diverse range of sizes of grains of waste glass. The decrease in mechanical properties with increasing glass waste content was less evident for thinner glassy powders, but a value of about 4-5 MPa indicated their potential use as non-structural materials [16]. Several authors have considered the effect of small aggregate particles on the mechanical properties of a geopolymer solution based on fly ash. It was found that the fluidity index of the solution is approximately linearly proportional to the modulus of the size of the sands. Geopolymer mortar has the best fluidity when the gradation of sand belongs to the I and II categories. The compressive and flexural strength of the geopolymer solution improves with an increase in the dispersion modulus of the sands, while the specific surface area and voidness are opposite. Additionally, the tensile strength first increases and then decreases as the modulus of size increases [17].